Chemical Aids Manual
        For Wastewater
      Treatment  Facilities
                by

            Nancy E. Heim
            Bruce E. Burns
          Culp/Wesner/Culp
        Clean Water Consultants
       Santa Ana, California 92707
      EPA Contract No. 68-01-5085
          EPA Project Officer
             Lehn Potter
           December 1979
U.S. Environmental Protection Agency
 Office of Water Program Operations
   Municipal Construction Division
       Washington, DC 20460

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                         DISCLAIMER
This report has been reviewed by the U.S. Environmental
Protection Agency, and approved for publication.  Approval
does not signify that the contents necessarily reflect;
the views and policies of the U.S. Environmental Protection
Agency, nor does mention of trade names or commercial products
constitutes endorsement or recommendation for use.
To order  this  publication, MO-25,  "Chemical Aids Manual
for Wastewater Treatment  Facilities," write to:

      General Services  Administration  (8BRC)
      Centralized  Mailing  Lists  Services
      Building  41, Denver  Federal  Center
      Denver, Colorado   80225

Please indicate the MCD number  and title of publication.

Multiple  copies maybe  purchased from:

      National  Technical Information Service
      Springfield, Virginia   22151

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                              ACKNOWLEDGEMENTS
     This manual was prepared under the direction of Mr. Lehn J. Potter,
Project Officer, Watfer Program Operations of the U.S. Environmental
Protection Agency.  Preparation and development of the manual was carried
out by Nancy E. Heim,-Bruce E. Burris, George M. Wesner, William E. Ettlich,
and William R. Whittenberg of Gulp/Wesner/Gulp.

     Recognition also is due to the following individuals and their
staff for time and assistance in reviewing the draft manual:
     Mr. Dom Calicura
     Mr. Ken Meyer
     Mr. Bernard Miller
     Mr. David Deaner
     Mr. Stan Martinson
City of Placerville, CA
El Dorado Irrigation District
Irvine Ranch Water District
California State Water Resources Board
California State Water Resources Board
     The authors also-wish to thank the following individuals for their
contributions in making this manual possible:
     Mrs. Joan Morrow
     Mrs. Barbara Van Hoven
     Ms.  Amy Amirani
Typing
Editing
Drafting
                                      iii

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                            TABLE OF CONTENTS
Disclaimer
Acknowledgements
List of Tables
List of Figures

1.  INTRODUCTION	       1
        Purpose of Manual  	       1
        Manual Organization	.• .  .  .       2
        Use of the Manual	       3

2.  PLANNING AND EVALUATING PLANT EFFECTS  	       8
        Treatment Efficiencies 	 .  	       8
        Selecting Points for Chemical Addition 	      17
        Guidance on Chemical Dosages 	      24
        Sludge Considerations  	      34
        References	      45

3.  SELECTING CHEMICALS FOR USE	      46
        Effectiveness	      47
        Cost	      48
        Reliability of Supply  	      49
        Sludge Considerations  	      51
        Compatibility with Other Treatment Processes  	      52
        Environmental Effects  	      52
        Labor Requirements	      52
        References	      56

4.  FEEDING & HANDLING SYSTEMS	      57
        Dry Chemical Feeders 	      58
        Solution Feeders	•  •      67
        Gas Feeders	      70
        Feed System Requirements for Specific Chemicals  ...      70
        Storage	;	      87
        Piping and Handling Materials  . 	      93
        Manual and Flow Pacing Control for Chemical Feed
          Systems	      93
        Automatic Control for Chemical Feed Systems   	     100
        References . . . .	     102
                                   IV

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5.  PROBLEMS WHICH CAN BE AIDED BY CHEMICAL ADDITION
        Collection Systems .  	 .....
        Conventional Wastewater Treatment  .....
        Advanced Waste Treatment . .  .  .  	
        Sludge Treatment and Conditioning  . .  .  .  .
    APPENDIX—INFORMATION ON CHEMICALS
        Appendix Index ........
103
105
108
126
132

A-l
A-2

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                                   TABLES
Number

   1
   2

   3
   4
   5
   6
   7
   8
   9
  10
  11

  12
  13
  14
   15
   16
   17
   18
   19
   20

   21
   22
   23
   24

   25
Distribution of HOC1 and OC1~ with pH ,	     9
Effect of Chemical Treatment on Primary Clarifier
  Performance 	    H
Polymer Addition to Primary Clarifier 	    13
Lime Addition to Primary Clarifier	    14
Effect of Chemical Treatment on Clarifier Performance ..   15
Typical Solid Bowl Centrifuge Performance .......    18
Typical Design and Performance Data for Vacuum Filters     19
Typical Performance Data for Pressure Filters 	    20
Techniques for Evaluation of Chemical Dosages 	    25
Chlorine Dosage Ranges  	    26
Neutralization Factors for Common Alkaline and Acid
  Reagents	ซ	    32
Typical Chemical Dosages for Sludge Conditioning  ...    33
Chemical Dosage Guide  .	    35
Additional Sludges to be Handled with Chemical
  Treatment  Systems:  Primary Treatment for Removal of
  Phosphorus	    36
Additional Sludges to be Handled with Chemical
  Treatment  Systems:  Mineral Addition to Aeration
  Basin for  Removal of Phosphorus	    37
Additional Sludges to be Handled with Chemical
  Treatment  Systems:  Mineral Addition to Secondary
  Effluent for Removal of Phosphorus	    38
Estimate of  Lime Sludge Quantities	    40
Estimate of  Alum Sludge Quantities	    41
Estimate of  Iron Sludge Quantities  	    42
Example Cost Comparison of Disinfection Alternatives
  for a 5  mgd Plant	    50
Environmental Effects  of Chemical Discharges   	    53
Chemical Treatment Labor Requirements 	    55
Types of Chemical Feeders	    72
Compatible Materials for Piping and Accessories of
  Commonly Used Chemicals  	    94
Materials Suitable for Caustic Soda Systems  	    95
                                      vi

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                                   FIGURES
Number       	, ,       .. •  ..,''''                              Page

   1      Potential Lime Application Points for Phosphorus
            Removal ..... . . ..•. „ .... .	    23
   2      Lime Dosage as Related to Wastewater Alkalinity ....    28
   3      Typical Phosphorus Reduction with Alum	    29
   4      Chemical Feeding System Schematic 	 .....    57
   5      Typical Dry Feed System0 ................    59
   6      Positive Displacement Rotary Feeder	    61
   7      Oscillating Hopper or Universal Volumetric Feeder ...    62
   8      Volumetric Belt Type Feeder ...............    64
   9      Typical Helix or Screw Type Volumetric, Feeder (courtesy
            of Wallace & Tiernan, Division of Pennwalt Corporation)  65
  10      Pivoted .Belt Gravimetric Feeder	    66
  11      Rigid Belt Gravimetric Feeder	    68
  12      Typical Solution teed System.  .............    69
  13      Positive Displacement Pumps .  	 .......    71
  14      Illustrative Lime Feed System  for Wastewater Coagulation   77
  15      Typical P.aste-Type Slaker... .  .............    78
  16      Typical Detention-Type Slaker	    79
  17      Alternative Ozonation Systems  .............    81
  18      Typical Ozone Contact Basin Using Porous Diffusers   .  .    82
  19      Manual Dry Polymer Feed System ............    84
  20      Automatic Dry Polymer Feed System ...........    85
  ,21      Typical Positive-Negative Pneumatic Conveying System  .    89
  22      Typical Bulk Storage Tank . .  . . . . 	 ....    91
  23      Alternative Liquid Feed Systems for Overhead Storage   .    92
  24      Alternative Liquid Feed Systems for Ground Storage   .  .    92.
                                    vii

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  SECTION 1




INTRODUCTION

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                                  SECTION 1

                                INTRODUCTION
PURPOSE OF THE MANUAL

     The purpose of this manual is to assist wastewater treatment plant
operators in the proper use of commonly used chemicals in wastewater treat-
ment processes.  Emphasis has been placed on providing practical guidance
on the use of chemicals to overcome temporary operational problems or to
upgrade performance without extensive design work or plant modifications.
The manual specifically addresses:

     • The use of chemicals as a temporary aid in solving operational
       problems.

     • Selection of chemicals to be used in terms of treatment
       efficiency, cost and other considerations.

     • Selecting points for injection of the chemicals.

     • Determining proper chemical dosages.

     • Sludge considerations associated with chemical additions.

     • Identification of equipment for proper feeding and handling
       of chemicals.

     • General information on each chemical including uses, available
       forms, commercial strength, cost, safety considerations, feeders,
       storage, handling materials and major manufacturers.

     While chemical addition may be helpful in many wastewater  treatment
processes, it must be recognized  that many situations presented in the manual
are  indications of problems associated with overloading or weaknesses
in process control.  Short term correction using chemicals may be necessary,
but  the  condition causing the problem also must be corrected.   CHEMICALS
SHOULD NOT BE USED AS A SUBSTITUTE FOR GOOD PLANT OPERATING PROCEDURES.

     Some problems  in plant operation may be beyond the ability of the oper-
ator to  control and are too detailed to be presented adequately in this manu-
al.   The operator should learn to identify and define these problems through
experience and the use  of references provided in this manual.  Plant modifi-,
cations  and  installation of_chemical storage, handling, and feed equipment,

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as noted in this publication, generally should not be performed by the opera-
tor without the aid of a qualified consulting engineer.  Most modifications
require an engineering analysis of the problem and a detailed engineering de-
sign of the change.                                     *

MANUAL ORGANIZATION

     In order to simplify the manual and maximize its potential use as a
reference guide, the manual has been organized into five sections plus an
Appendix.  The sections may be used independently or in combination depending
on the operator's background and need.  Each section is preceded by a quick
reference index to help the operator locate specific information quickly and
easily.  Each section is followed by a separate list of references which
provide more detailed information relative to that section.
      Section  1      INTRODUCTION

                    The purpose and  organization of  the manual, along with an
                    example  of the use  of  the manual are  described  in this
                    section.

      Section  2      PLANNING AND  EVALUATING PLANT  EFFECTS

                    The optimum use  and efficiency of many  chemicals are  inter-
                    related  with  such factors as wastewater pH and  tempera-
                    ture,  the point  at  which the chemical is added  in the
                    treatment train, chemical dosage, and the physical opera-
                    tion of  the treatment  facilities.  This section of the
                    manual discusses these factors and provides guidance  on
                    planning and  evaluating plant  effects when chemicals  are
                    added  to various treatment  processes.

      Section  3      SELECTING CHEMICALS FOR USE

                    This section  describes^general factors  to consider in
                    selecting chemicals including  effectiveness,  cost, reli-
                    ability  of supply,  sludge considerations, compatibility
                    with other treatment processes,  and environmental effects.

      Section  4      FEEDING  AND HANDLING SYSTEMS

                    During the decision-making  process of which chemical  to
                    use, the operator may  need  information  on chemical feed-
                    ing and  handling systems.   This  section contains basic
                    information on dry, solution and gaseous feed systems
                    as well  as special  requirements  for certain chemicals.
                    Various  types of control systems for  chemical feeders
                    also are described.

      Section  5      PROBLEMS WHICH CAN  BE  SOLVED BY  CHEMICAL ADDITION

                    This section  of  the manual  serves primarily as  a trouble-

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     Appendix
shooting guide to help identify problems which can be
solved by the addition of chemcials.  Problems are identi-
fied by the treatment process where the problem would
occur.  A solution is provided for each problem, along
with a list of possible chemicals for solving the problem,
advantages and disadvantages of each chemical, and poten-
tial application points.  The section is preceded by an
INDEX OF PROBLEMS which serves as quick reference to
locating problems with various treatment processes.

INFORMATION ON CHEMICALS

General information on each chemical is proyided in this
section, including uses of the chemical, trade names,
available forms, commercial strength, feeders, storage,
safety considerations, approximate cost, acceptable
handling materials, and major chemical manufacturers.  For
easy reference, the chemicals are arranged  in alphabetical
order.  Because it is not possible or practical to iden-
tify all manufacturers of each chemical, the operator  is
encouraged to add his own local supplier to the list wher-
ever .possible.                         .         -        -
USE OF THE MANUAL
     To give the operator a good basic understanding of the manual and its
format, .the following-provides a simplified, step-by-step example on how the
manual might be used.               .. ,     :.',..-,

Example Situation

     A 5-mgd trickling filter plant normally uses sodium hypochlorite for
disinfection of its effluent.  The plant  is equipped with a ROTODIP Feeder
for application of the sodium hypochlorite.  Because the plant is isolated
from any large cities, the operator normally stores large quantities  (several
months' supply) of the disinfectant on-site at  the plant to minimize
shipping problems and chemical costs.  However, the effluent lacks sufficient
chlorine residual, even with relatively high chlorine, dosages.  The operator
suspects that the sodium hypochlorite supply may be losing its disinfection
power because of long-term storage.  As a result, the operator is considering
the use of other chemicals for disinfection.

Steps  to Problem Solution

      1.  Using the index to Section 5  (page 104), the operator locates the
         DISINFECTION process on page  124.

     2.  The operator turns to page 124 and identifies several possible chemicals
         which may solve the problem.  'Examining the advantages and disadvan-
         tages of each chemical, the operator notes the following:

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    •  CHLORINE GAS may be feasible but expensive for a plant of this
       size.

    •  SODIUM HYPOCHLORITE (as currently being used) is economical for
       small plants but deteriorates more rapidly than some other chlorine
       forms.

    •  CALCIUM HYPOCHLORITE is more stable and has more available
       chlorine than sodium hypochlorite, and it is economical, for small
       plants.

    •  CHLORINE DIOXIDE is expensive and must be generated on-site.

    •  OZONE also is expensive, leaves no residual and must be generated
       on-site.

3.  Upon assessing these advantages and disadvantages, the operator is
    able to see that it may be possible to use CHLORINE GAS, CALCIUM
    HYPOCHLORITE, or continue to use SODIUM HYPOCHLORITE with some
    adjustments in plant operations.

4.  Faced with the uncertainty of which chemical to use, the operator
    checks Section 3 to find out other factors which may influence the
    choice of chemical.  He notes that EFFICIENCY, COST, and RELIABILITY
    OF SUPPLY will be important considerations.

5.  If the operator is unfamiliar with the EFFECTIVENESS aspects of
    chlorine and chlorine compounds he would refer to Section 2  for more
    information.

6.  To evaluate chemical COSTS, the operator would determine the pounds
    per day of each chemical required.  Referring to the APPENDIX index
    (Page A-2) the operator checks for more information on each chemical:
            CHLORINE
            CALCIUM HYPOCHLORITE
            SODIUM HYPOCHLORITE
Page A-13
Page A-9
Page A-36
    Assuming a 10 mg/1 chlorine dosage and a plant flow of 5 mgd, the
    operator makes the following dost comparison:

    CHLORINE

    •  10 mg/lx 8.33 x 5 mgd = 417 Ib/day

    •  From page, A-l3, cost = $195 - $230/ton

    •  417 Ib/day x ton/2000 Ib x $230/ton = $48/day

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CALCIUM HYPOCHLORITE (65%)

^  10 mg/1 x 8.33 x 5 mgd
          vJ • D J
                                      642 lb/day
         •  From page A-9, cost = $0.70/lb

         •  642 5lb/day x $0.70/lb = $449/day

         SODIUM HYPOCHLORITE (12%)
         0  From page A- 36, cost = $0.40-$0.90/gal

         •  348 gal/day x $0.90/gal = $313/day
NOTE - This is NOT a complete cost comparison and only involves the cost of
       chemicals.  It does not include feeding and handling costs which could
       make a considerable difference in overall plant costs.  For example,
       chlorine gas itself may be very inexpensive but feeding, handling and
       storage facilities may make it more expensive than other chlorine forms.

     7.  Referring to the APPENDIX, the operator identifies and contacts major
         manufacturers to verify chemical COSTS and the RELIABILITY OF SUPPLY
         in the local area.

     8.  Again studying the APPENDIX, the operator notes relevant information
         on the storage, feeding, handling and safety aspects for each of the
         chemicals under consideration.  In particular, the operator notes
         the following:  .

         •  CHLORINE —- requires a gas feeder (which the plant does not have)
            and special safety precautions that will require additional equip-
            ment expenditures.  He makes a more detailed assessment of chlorine
            feeders after referring to the text in Section 4.

         •  CALCIUM HYPOCHLORITE --is corrosive and must be stored carefully,
            but can be fed with a ROTODIP Feeder — the same feeder already
            being used for sodium hypochlorite.  To make sure there is not
            other important information on feeding calcium hypochlorite, the
            operator checks Section 4.

     9.  Based on the information gathered by the operator, a reasonable com-
         parison between the alternative chemicals has been made taking into
         account:

                 •  Cost
                 •  Effectiveness

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        •  Safety
        •  Storage
        •  Feeders
        •  Reliability of Supply

Since not all of these factors will be equally important, the
operator must consider circumstances specific to the treatment plant
before making a final choice on the chemical to use.

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               SECTION 2




PLANNING AND EVALUATING PLANT EFFECTS

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                                •  SECTION 2

                    PLANNING AND EVALUATING PLANT EFFECTS


                      QUICK REFERENCE INDEX OF SUBJECTS
Subject                                                                   Page

TREATMENT EFFICIENCIES 	  	    8
     Disinfection  ............  	  .......    8
     Coagulation	•  •    9
     Precipitation of Heavy Metals 	•    16
     Sludge Conditioning		    16

SELECTING POINTS FOR CHEMICAL ADDITION	  .	    17
     Chemical Addition for Increased SS and BOD Removal	    21
     Chemical Addition for Phosphorus Removal  	  :.....    22

GUIDANCE ON CHEMICAL DOSAGES	.24
     Disinfectants	    24
     Coagulants	    27
     Coagulant Aids	    30
     Filter Aids	.  . .	    30
     pH Adjustment	  .  ., , .  .  .  •  • •  -  •  •  •  •. .  •  • ...  •  •  •    30
     Sludge Conditioning	    31
     Chemicals for Other Uses   	 ........  	    34

SLUDGE CONSIDERATIONS	    34
     Sludge Quantities . . . -.  .  . . -. •.	    34
     Sludge Processability	    39
     Sludge Disposal	'.'..'.	    43

REFERENCES	' ซ    45

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                                    SECTION 2

                       PLANNING AND  EVALUATING  PLANT  EFFECTS


      Most often,  the  use  of  chemicals  in wastewater  treatment  is  related  to
 one or more of the  following major  applications:

    • Disinfection
    • Coagulation  and  flocculation
    • Precipitation  of dissolved  substances
    • pH adjustment
    • Sludge conditioning

 Because there are large variations  in  wastewater  composition from plant to
 plant, it is impossible to present  precise predictions  on how  a particular
 plant or process  will be  affected by the addition of chemicals to the  treatment
 scheme.   The optimum  use  and efficiency of many chemicals is interrelated
 with such factors as  wastewater  pH  and temperature,  the point  at  which the
 chemical is added d,n  the  treatment  train, chemical dosage, and the physical
 operation of the  treatment facilities.

      This section of  the  manual  will address  these factors and provide
 guidance on planning  and  evaluating plant effects when  chemicals  are added
 to various treatment  processes.   THE OPERATOR IS  REMINDED THAT CONSIDERATION
 MUST BE GIVEN TO  THE  EFFECTS OF  CHEMICAL ADDITION ON SUBSEQUENT TREATMENT
 PROCESSES AND OVERALL PLANT  OPERATIONS. IF THE OPERATOR IS  NOT COMPLETELY
 FAMILIAR WITH TECHNIQUES  DESCRIBED  IN  THIS SECTION,  THE SERVICES  OF A
 CONSULTANT ARE HIGHLY RECOMMENDED.
TREATMENT EFFICIENCIES

Disinfection

     Although there are other chemicals which can be used for disinfection,
only the most commonly used chemicals will be discussed, including liquid-gas
chlorine, hypochlorites, chlorine dioxide and ozone.

     When chlorine is added to water, several reactions occur which result in
the formation of hypochlorous acid (H0C1) and hypochlorite ions (OC1~).
Table 1 shows the distribution of these two species at various pH values.
As illustrated in the table, low pH values favor the formation of HOC1
which is a much more effective germicide than OC1~.  Because liquid-gas

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 chlorine tends  to  lower the pH,  and hypochlorites such as sodium hypochlorite
 and calcium hypochlorite tend to raise pH,  the residual formed by liquid-gas
.chlorine would  be  a more effective germicide in poorly buffered waters.
 There are four  major factors which may have an adverse effect on the
 germicidal efficiency of chlorine:


    •  The presence of ammonia and organic nitrogen
    •  High pH (above 7.5)
    ป  Low wastewater temperature
    •  Insufficient chlorine dosage or  contact time.                • --- •
      In  practice,  the  germicidal  efficiency  of  chlorine  dioxide  in  the neutral
 pH range is  about  the  same  as  that  of  chlorine.  However,  the  efficiency  of
 chlorine dioxide is  increased  when  the pH is. raised above  8.5.

      Ozone is  a rapid  and highly  effective disinfectant  capable  of  destroying
 bacteria as  well as  viruses.   Unlike chlorine,  the effectiveness of ozone is
 relatively independent of pH and  temperature.


                                    TABLE  1          .''...   -,              -.

                     Distribution  of HOC1  and OC1~ with pH

                                Percentage of Total Free Chlorine as:
               pH                          HOC1        -OC1~

             6.0                 .         96.8         3.2
             7.0                  -       75.2        .24.8

             ;7.5                          49.1        50.9
             8.0                          23.2        76.8

             9.0                           2.9        97.,1                 V
  Coagulation

       The  chemicals most  commonly  used  as  coagulants  in wastewater  treatment
  are  lime  {Ca(OH)2},  alum {AlaCSOOs  •  14H20},  ferric chloride  {FeCl3},  ferrous
  sulfate {FeSOif},  ferric  sulfate {Fe^SOO 3^ and sodium  aluminate
  {Na2Al204 •  3H20}.   Coagulant aids most often  used include polymers  and
  bentonite clay.   These coagulants and  coagulant aids are added to  wastewaters
  primarily to enhance removal  of suspended solids and phosphorus, but also
  to reduce heavy metal concentrations and  improve disinfection. The  choice
  of specific  coagulants and coagulant aids depends on the nature of the  solid-
  liquid system to  be  separated, and particularly on the pH of the wastewater.

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     Proper choice of chemical coagulants can be best determined by
laboratory testing.  This testing should be extensive enough to permit
evaluation of different chemicals and combinations of chemicals and to
determine an approximate dosage.  Laboratory test results usually cannot
be applied directly to the actual plant situation, since plant hydraulics
are not simulated in the laboratory.  The chemical or combination of
chemicals which appears most favorable in the laboratory should be further
evaluated in a pilot-scale test.

     For enhanced suspended solids and BOD removal , Coagulants can be add-
ed to primary or secondary clarifiers.  Table 2 shows clarifier performance
before and after chemical addition, and illustrates considerable variation
in BOD and SS removals.  However, the greatest improvement resulting from
polymer addition occurs where the existing clarifier performance is poor.
The variations shown make it difficult to project the expected improvement
due to chemical addition at a specific treatment plant.  Pilot plant tests
or full scale plant trials generally are necessary for such predictions to
be made accurately.  As guidance, however, Table 3 provides a summary of
typical removal efficiencies for both activated sludge and trickling filter
plants when polymer is added to the primary clarifier.

     Lime addition to primary clarifiers for phosphorus removal has been used
in many locations.  In all cases, significant improvements in both SS and BOD
removal also were noted, as shown in Table 4.

     In many cases  where chemicals are added to secondary processes, the
principal goal has been phosphorus removal.   Very often the addition of iron
and aluminum salts used for phosphorus removal can also improve greatly the
performance of the secondary clarifier depending on the dosage applied,
point of chemical addition and the flocculating characteristics of the system.
Several examples of typical clarifier performance before and after chemical
addition are shown in Table 5.

     When the biological and chemical processes are combined, the coagulant
may be added either ahead of the primary clarifier or directly to the aera-
tion tank of an activated sludge system.  When added ahead of the primary
clarifier, alum, iron or lime may be used; when added directly to the aera-
tion tank, iron or alum salts are used.  In the approach which separates the
physical- chemical processes from biological treatment, any of the above
coagulants may be added to the secondary effluent with subsequent settling
downstream.
          ms  in which chemical coagulation  is combined with the b :' o Logi •••> '
process are capable of phosphorus removal rates of 75-85 percent.  This would
be equivalent to effluent phosphorus concentration of 1-2 mg/1.  Subsequent
filtration of this effluent may reduce the phosphorus concentrations to 0.5
mg/1 if the coagulant dose is proper.  In systems using chemical coagulation
of secondary effluent as a separate process, lower phosphorus concentrations
on the order of 0.05 mg/1 can be achieved.  More detailed information on the
use of chemicals solely for phosphorus removal is described in the Process
                                       10

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-------
               TABLE 3
Polymer Addition to Primary Clarifier
                     Primary Clarifier
Total Plant
Treatment Process
Activated Sludge
Trickling Filter

Activated Sludge
Percent Percent Percent Percent
Removal Removal Removal Removal
Before After Before After
Polymer Polymer Polymer Polymer
Coagulant Dose Addition Addition Addition Addition
mg/1 BOD SS BOD SS BOD
Purifloc
A-21 1 26 — 48 — 83
Purifloc
A-21 1 23 43 33 76 79
Purifloc
A-23 0.21 31 31 46 51 79
SS BOD
90

72 85
85 83
SS

84
89
                   13

-------
                                    TABLE 4
                      Lime Addition to Primary Clarifier
Location
Richard
Hill, Ontario
Lime Added
 Percent Removal
in Primary Before
  Lime Addition
      Percent Removal
     in Primary After
       Lime Addition
    175
 21
37    71
     Remarks

Duluth,
Minnesota
Rochester,
Nex* York
Lebanon,
Ohio
mg/1 CaO BOD
75 50
125 55
100
145
SS BOD
70 60
70 75
50
66
SS
75
90
80-90
74

—
Jar tests
Pilot pla:
77   Full-scale
Central Contra       378       46
Costa, Calif.        303       37
                            71
                            71
                     74
                     69
                   79   Full-scale
                   76   Full-scale
                                      14

-------
                                   TABLE  5
              Effect  of Chemical  Treatment on  Secondary
                          Clarifier Performance
                                              Kfflucnt IIODg   Effluent SS   Effluent HODS   Effluent SS   Total
Location

Kichardnon, Texas

Chapel Hill,
North Carolina
Pennsylvania Stale

Cincinnati,
Ohio
Lebanon,
0)iio
Minneapolis,
MitincMuU
Madison,
Wi.-consin
I'niversity. Park,
Pennsylvania


RluomJnglon,
Illinois




Blue Plains,2
Washington, D.C



Sundusky, Ohio

Michigan City,
Indiana
Guelph, Ontario

Pal melto. Florida

Type of Plant

Trickling filler
sld. rate
Trickling filler
high rate
.Conventional
activated sludge
Activated sludge
(1 00 gpd pilot)
Activated sludge
(0.1 1 mgd pilot)
Trickling filter
low rate

—
Trickling filter



Activated sludge


.Trickling filter


Modified Activated
sludge



Conventional
activated sludge
Conventional
activated sludge
Conventional
activated sludge
Trickling filter

Location of Chemical and (or COD) Before Before (or COD) After After
Chemical A'ddition Dosage Chemical Addition Chemical Addition Chemical Addition Chemical Additi

Before final willing

Before final settling

Aerator effluent

Aerator

Final clarifier

- Before final settling

Before final settling

Before final settling



Aerator


Before final settling


Before final settling




Aerator

Aerator

Aerator

Before final settling


AI/PMole
Dosage 1.6/1
Al/P Mole
Dosage 1 .6/1
Al/P wt.
Ratio 3/1
10mg/IAl3+

Add lime to
raise pH=9.4-10.9
720 mg/1
Ca(OH)2
200 mg/1
' Alum
)60 mg/1
Alum
46 mg/1
Na2Al2ฐ4
33.9 mg/1 Fe3+
+0.7 mg/1
Purifloc — A23
25-30 mg/1 Fe3+
+0.5 mg/1
Purifloc - A23
26 mg/1 Alum
50 mg/1 Alum
60 mg/1 Alum
80 mg/1 Alum
89 mg/1 Alum
SOrng/1
Alum
60 mg/1
Alum
100 mg/1
Alum
45 mg/1
Alum
mg/1

20

44

13
(8<ซ)1


—

83

8-29

18

61


8.8


13.0
47
38
68
46
50

9

13

26
—

mg/1

IS

64

26
(9556)1


43.5

—

— :

31

95


12.7


49.6
48
39
53
41
57

24

19

38
30-40

mg/I

<5

15

9
(9256)1


—

27

1 .8-2.9

6

23


5.0


3.3
40
27
. 25
41
30

2

9

14
—

mg/1

<7

34

22
(96*)!


16.5 /

— -

—

19

8


8.6


16.0
43
36
36
31
31
• -.
15

7

22
10

Phos.
ion Removal
percent

95

82

86
94


•

•'•-"'86

98.7

96.4

93.4


	


~ -
	
—
—
—
—

80

92.2

87
—

* Percent removal.
2j)ata arc monthly average.
                                        15

-------
Design Manual for Phosphorus Removal (Reference 4).   The manual  provides
a comprehensive discussion of phosphorus removal methods involving chemical
precipitation, design information, and operating procedures aimed at removal
of phosphorus to comply with water quality standards.

Precipitation of Heavy Metals

     Because many heavy metals form insoluble hydroxides at pH 11, lime
coagulation results in a significant reduction in metal concentrations.
Except for mercury, cadmium, and selenium, lime coagulation at pH 11 can
remove at least 90 percent of most heavy metals.  Higher removal efficiencies
occur when lime coagulation is followed by filtration.

Sludge Conditioning

     In most cases, it is not practical to dewater sludge, especially
secondary sludge, without conditioning.  The conditioning step can take the
form of either a chemical or a physical process.  Chemical methods include
the use of organic and inorganic flocculating  chemicals as well as chlorine
oxidation.  The physical processes include the use of heat and freezing to
change the characteristics of the sludge.  Only the use of chemicals for
conditioning will be addressed in this section, since the physical processes
are outside the scope of this manual.

     The most common chemical conditioning method is the use of ferric chloride
alone or in combination with lime.  Lime alone is a fairly popular conditioner
for raw primary sludge and ferric chloride alone has been used for conditioning
activated sludges.  Lime treatment to a pH of  10.4 or above has the added
advantage of providing a significant degree of disinfection of the sludge.
Other inorganic chemicals used include ferrous salts and aluminum salts.

     Organic polymer coagulants  and coagulant aids have been developed in
the past 20 years  and are rapidly gaining acceptance for sludge conditioning
since they accelerate the removal of liquid from sludge  particles during
dewatering.  There are three basic types of these polymers:

     1.  Anionic  (negative charge) - serve as  coagulant  aids to inorganic
         A1+++ and Fe+'H- coagulants by increasing the rate of  flocculation,
         size, and toughness of particles.  Because  of improved flocculation
         with anionic polymers, smaller dosages of alum  or other  primary
         coagulants usually are required.

     2.  Cationic  (positive charge) -  serve as primary  coagulants alone or
         in  combination with inorganic  coagulants such  as  alum, or  even
         with other  anionic  and nonionic  polymers.   When used  alone,
          strongly cationic  polymers  react much more  slowly than inorganic
          coagulants,  and  therefore  require  longer mixing times.

      3.  Nonionic (equal  amounts  of  positively and negatively  charged  groups
          in monomers)  - serve  as  coagulant  aids  in  a manner  similar to that
          of both anionic  and cationic polymers.  Nonionic polymers  are generally

                                      16

-------
        reliable coagulant aids since treatment is usually .less sensitive
        to minor overdoses.

Usually, cationic polymers have the greatest application to waste sludge     .'
dewatering.  In some cases, cationic polymers and ferric salts together have
been used effectively.  For tertiary waste treatment sludges containing
aluminum, ferric, or lime sludges, anionic polymers are often effective.

     With proper chemical conditioning, the sludge moisture can be reduced
from 90 - 96 percent to 64 - 80 percent, depending on the nature of the
solids to be dewatered.  The conditioning step greatly increases the rate
of dewatering by changing the chemical and physical nature of the sludge.
However, because of the differences in sludges and their conditioning
properties, it is common practice to run either a Buchner funnel or a
filter leaf test to determine the best flocculating chemical.  These tests
help to estimate the rate at which the solids can be filtered and the final
moisture content the cake will attain.  Various chemicals and combinations
of chemicals can be tried in the laboratory to establish the full—scale
chemical dosage.  Laboratory tests generally will define the chemical
dosage and operating characteristics of a dewatering unit within 15 percent
of the range established for the full-sized facility.


     The use of polymers and other conditioning chemicals has allowed more
sludge types to be dewatered more efficiently by centrifuges,  vacuum filters
and pressure filters.  Table 6  shows typical solid bowl centrifuge sludge
cake characteristics and the effect of various polymer dosages on percent
solids recovery.  The degree of solids recovery can be controlled over wide
ranges depending on the amount of coagulating chemical applied.   When polymers
are used, however, a wetter sludge cake usually is produced because of the
additional fines capture. Table 7  summarizes design and performance data
for vacuum filtration of different types of sludges using different chemical
conditioners.  Table 8  summarizes similar data for pressure filtration using
various conditioners.

SELECTING POINTS FOR CHEMICAL ADDITION

     In many applications, proper points for chemical addition are well
defined and easily recognized by the operator.  For example, wastewater
disinfection is the last step in a secondary plant, and disinfectants are
added directly to the secondary effluent prior to discharge from the plant.
On the other extreme, it is generally more difficult for an operator to
determine the best point for adding coagulants to"enhance suspended solids,
BOD, or phosphorus removal.  The remainder of this section ,will describe some
of the more important factors to consider in selecting points for coagulant
addition.  Section 5 of this manual provides more general guidance on
application points for other chemicals and processes used in wastewater
treatment.                                           "
                                    17

-------
                                 TABLE 6
                Typical Solid Bowl Centrifuge Performance
     Sludge Type


Raw or digested primary

Raw or digested primary, plus
  trickling filter humus

Raw or digested primary, plus
  activated sludge

Activated sludge

Oxygen activated sludge

High-lime sludges

Lime classification
       Design
     Assumption
no conditioning

5-15 Ibs polymer/ton
no conditioning

5-20 Ibs polymer/ton
no conditioning

5-10 Ibs polymer/ton

3-5 Ibs polymer/ton

no conditioning

no conditioning
 Percent
 Solids      Percent
   to         Solids
Centrifuge   Recovery
28-35
20-30
15-30
8-9
8-10
50-55
40
70-90
80-95
60-75
80-95
50-65
80-85
80-85
90
70
                                    18

-------
                                 TABLE 7

         Typical Design and Performance Data for Vacuum Filters
Sludge Type

Primary


Primary + FeCl3
Primary +
  low lime
Primary +
  high lime
Primary + WAS
Primary +
   (WAS + Fegi3)
 (Primary +
  + WAS
Waste activated
  sludge  (WAS)

WAS + Fed,,
Digested primary
Digested primary
  + WAS

Digested primary
  +  (WAS + FeCl3)

Tertiary alum
Design Assumptions

Thickened to 10% solids
Polymer conditioned

85 mg/1 FeCl3 dose
Lime conditioning
Thickening to 2.5% solids

300 mg/1 lime dose
Polymer conditioned
Thickened to 15% solids

600 mg/1 lime dose
Polymer conditioned
Thickened to, 15% solids

Thickened to 8% solids
Polymer conditioned

Thickened to 8% solids
FeCl3 and lime conditioned

Thickened primary sludge
to 2.5%
Flotation thickened WAS
to 5%
Dewater blended sludges

Thickened to 5% solids
Polymer conditioned

Thickened to 5% solids
Lime + FeCl3 conditioned

Thickened to 8-10% solids
Polymer conditioned

Thickened to 6-8% solids
Polymer conditioned

Thickened to 6-8% solids
      + lime conditioned
 Typical
 Loading   Percent   Percent
 Rates,     Solids     Solids
(psf/hr)    to VF    VF Cake
   8-10
   10
   4-5
   1.5
 2.5-3.5
 1.5-2.0
   7-8
 3.5-6
 2.5-3
10       25-38
 1.0-2.0     2.5
             15
15
3.5
6-8
6-8
         15-20
         32-35
28-32
         16-25
                        20
15-20
           15
           15
8-10     25-38
14-22
16-18
Diatomaceous earth
precoat
   0.4     0.6-0.8    15-20
                                    19

-------
                                 TABLE 8
              Typical Performance Data for Pressure Filters
Sludge Type

Primary


Primary + FeCl3

Primary + 2 stage
  high lime

Primary + WAS


Primary + (WAS + FeCl3)

(Primary + FeCl3) + WAS

WAS


WAS + FeCl3

Digested primary

Digested primary + WAS


Digested primary +
   (WAS + FeCl3)

Tertiary alum

Tertiary low lime

Sludge Conditioning
5% FeCl3, 10% Lime
100% Ash
10% Lime (200 Ib/ton)
None
5% FeCl3, 10% Lime
150% Ash
5% FeCl3, 10% Lime
10% Lime
7.5% FeCl3, 15% Lime
250% Ash
5% FeCl3, 10% Lime
6% FeCl3, 30% Lime
5% FeCl3, 10% Lime
100% Ash

Typical
Cycle
Length
(hrs)
2
1.5
4
1.5
2.5
2.0
3
4
2.5
2.0
3.5
2
2
1.5
Percent
Solids
to
Pressure
Filter
5
4*
7.5
8*
8*
3.5*
5*
5*
8
6-8*

Percent
Solids
Filter
Cake
45
50
40
50
45
50
45
40
45
50
45
40
45
50
5% FeCl3, 10% Lime
10% Lime

None
6

1.5
6-8*


 4*

 8*
40


35

55
*  Thickening used  to achieve  this solids concentration.
                                    20

-------
 Chemical Addition for Increased SS and BOD Removal

      The most favorable point  for addition of  chemical coagulants and floe-
 culants may be influenced by the form in which phosphorus is  present.  Raw
 sewage in primary tanks,  for example,  usually  contains polyphosphates which
.are later broken down to orthophosphate by biological treatment.   Polyphosphates
 in relatively high concentrations (more than 1 mg/1 of  P20s) are capable of
 interfering with coagulation and sedimentation.   Orthophosphate compounds
 produce no interference with normal coagulation and sedimentation.   If the
 amount of polyphosphate interference in the primary state is  great,  then
 chemical addition should follow conversion of  this  material to orthophosphate.

      Adding chemicals to the primary elarifier is an effective upgrading
 procedure for a secondary plant when:

      1.  Wastewater flow is intermittent or vari'es  greatly.

      2.  Space available for additional clarification facilities is  limited.

      3.  Industrial wastes that would interfere with biological treatment
          are present.

      4.  Plant is hydraulically and/or organically  overloaded.

      5.  Improvements in existing treatment performance are required as
          an interim measure before the addition of  new facilities.

 When considering the addition of chemicals to primary elarifiers, IT IS
 IMPORTANT TO BE AWARE OF THE EFFECT ON SUBSEQUENT TREATMENT UNITS.  The
 increased removal of SS and BOD from raw wastewater can affect the downstream
 biological process in a number of ways.  If the BOD load to the aeration
 basin falls below 0.25 to 0.35 Ib BOD/lb MLVSS/day for long periods of time,
 nitrification can develop in the aeration basin.  This can reduce the total
 oxygen demand of the effluent, but will cause an added oxygen demand on the
 aeration facility because the oxidation of one pound of ammonia nitrogen
 requires about 4.6 pounds of oxygen.

        A  lower aeration basin loading will usually require more careful sludge
 management to ensure stable operation of the aeration basin.   However, the
 quantity of excess activated sludge generated under these reduced loading
 conditions will be much less than that generated under normal loading
 conditions.  This may be considered an added advantage of adding chemicals
 to the primary elarifier, if the additional fines captured chemically do
 not seriously degrade the quality of the primary sludge.

      Whenever possible, some flexibility should be built into the plant
 design to allow for different  points of chemical addition, since this
 aspect may severely affect costs and process efficiencies.  There may be
 some question as to where coagulants such as alum or iron salts should be
 added to the treatment scheme, when improved BOD, suspended solids and
 phosphorus removal is the primary goal.  As a general rule, where no flash

                                      21

-------
mix tanks are provided, alum should be added at a point where turbulence is
present to insure rapid mixing.  Addition of alum directly to an aeration
tank will not adversely affect the biological process, but some build-up of
aluminum compounds in the recirculated sludge may occur.

     Some studies have indicated that the turbidity of the final plant
effluent may be increased when alum is added to the aeration system.
This may occur when the alum dosage is high enough that it reduces the pH
below the optimum pH for good alum flocculation, resulting in an increase
in pinfloc in the final effluent.

     LIME ADDITION MAY NOT BE FEASIBLE FOR UPGRADING ACTIVATED SLUDGE
SECONDARY CLARIFIERS BECAUSE OF THE POTENTIAL ADVERSE EFFECT OF RECIRCULATED
LIME SLUDGE ON MIXED LIQUOR MICROBIAL CHARACTERISTICS.  Lime addition to
either  trickling filter or activated sludge secondary clarifiers will require
pH adjustment of the effluent before discharge to the receiving waters.
Lime addition to primary clarifiers may be used, if consideration is given
to controlling the pH  within acceptable limits for the subsequent processes,
and to  changes in sludge characteristics and handling requirements.

     The chemical addition of lime or metallic salts at various points
in a wastewater treatment plant usually results in increased solids weight
and/or  sludge volume.  Therefore, sludge piping, pumping and process units
should  be large enough to handle the increased sludge quantities.  Sludge
considerations associated with the use of chemicals at various points in
the treatment process are covered in a later section of this chapter.

Chemical Addition for Phosphorus Removal

     As illustrated in Figure  1 -,. there are several points where lime can be
added to the treatment scheme  for phosphorus removal.  Lime may be added
before  the primary sedimentation tank in a biological treatment plant.
Because an excessively high pH would interfere with the biological process,
lime addition to the primary  sedimentation tank ahead of an activated sludge
system  is limited to a pH of  about 9.0.  However, it  is not unusual for
2-3 mg/1 of phosphorus to remain soluble at this limited pH.  Additional
phosphorus removal may be achieved by using aluminum  or iron addition in
the aeration tanks or  final sedimentation tank.  Another  advantage ;to  the
use of  lime in primary treatment is the increase in organic and suspended
solids  removal in the  primary sedimentation tank.  This,  in turn, decreases
the load on the aeration system.

     A  second alternative is  lime  treatment following biological  treatment.
Phosphorus removal from  the secondary effluent assures  that  there will  be
adequate phosphorus  to meet the needs of the biological floe under aeration.
In addition, the biological system breaks down many of  the complex phosphates
to a  form which is more  easily removed by chemical treatment.  However, pH
of the  returned sludge could  affect biological treatment  and should be
considered.
                                     22

-------
LIHE
RAU., .„ . 	 	 MIXING
WASTE- & 	 *•
WATER COAG


1 ... ,; '!•; - .• .< }....,' • • -• '- • • .--
"ซ" '._-:.._,. ,!^N COMPLETE •-•
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WATER ; ' TREATMENT '
i SLUDGE

POLYMER
^UHFN ' LIME
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f $
RAW 	 gป ""ING
WAS It- & .. . Bปa
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i i >
SLUDGE
RECIRCULATION
CHEMICAL
REUSE
EFFLUENT

SLUDGE: .--.-, - . -- • :•;••• : ; „ '••.-;•?
1 *:.•-•-. ' --••;•: •'••.• ••••
LIME
i- •• - • • - •-,..-...,
: .-•-•,•-. : ?.:•. 	 - - - ' : . '
MIXING ' - ' EFFL"ENT V
1 ' COAG- ' -; -•"-'•
nAdRAAlfl)AAlAfilM&inAi@^ฎAffill%^^d^6Affii^^AAAlAAAfai9^fi)idKAAiKti
... ALUM (WHEN NEEDED) . , ' . '
RETURN ACTIVATED .
SLUDGE
,,
-------
     Like lime, there are several points where alum may be added to the
treatment scheme for phosphorus removal.  Alum may be added before the primary
settling tank, in the aeration tank, or following aeration before final sedimen-
tation.  Alum addition before the primary settling tank removes not only
phosphorus, but also removes suspended solids and organics.  These removals,
however, require an increased alum dosage to make up for the added demand.

     Providing alum addition in the activated sludge aeration tank allows
the usage of the mixing already provided for that system.  The best point of
addition for alum in an activated sludge plant may be in the effluent channel
of the aeration basin which carries mixed liquor to the final settling basin.
The turbulence in this channel provides adequate mixing for the chemical.
By adding alum after the biological system, the wastewater is stabilized
and the complex phosphates are put into a form more easily removed by the
chemical."  .          	    •  '••  .-•-.-.- .-' -----	    .... ,...":.•..' il..-'. Ji':	

GUIDANCE ON CHEMICAL DOSAGES                   .      ,  ,   :i             ,..••,;  ,:;
                                                     ' r  "s  ,
     In order to plan adequately  for the addition of chemicals to any treatment
process, design considerations should  include an estimate of the chemical    -i
dosages required.  It is not always possible to  determine through theoretical
calculations and laboratory tests precise dosages for optimum operating
conditions at the plant. However, Table  9  provides a summary of testing
techniques commonly used for evaluating chemical dosages  for various applica-
tions.  The table identifies the  test  name, purpose of the test, and a
reference describing the test procedure.  These  tests along with the guidance
provided in this section of the manual will help the operator to determine
the general ranges for dosages of chemicals commonly used in wastewater
treatment.

Disinfectants                                                              "

     The chlorine dosage required for  disinfection depends primarily on  the
quality of the effluent to  be  treated.   Table  10 provides  typical dosages
of chlorine for various levels  of treated wastewater.  Each plant's precise
requirements, however, also depend  on  the effluent,  the  degree of mixing
provided,  the  detention time available in the  contact tank  or outfall, and
the most probable number  (MPN)  requirements of the regulatory agency.

     Chlorine dosage  normally  is  controlled by maintaining  a  chlorine
residual.  Regular analyses of bacterial  quality should  be  made  and  the
target residual  adjusted depending  on  the trend  of  the results.

     For ozone disinfection of secondary effluent, typical dosages range
from 5 to 15 mg/1 for an MPN of 100/100 ml.  The amount and characteristics
of suspended solids present in the secondary effluent can affect the
required ozone dosage.
                                     24

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                .,                  TABLE 9

               Techniques for Evaluation of Chemical Dosages
     Test Name
            Purpose of Test
Jar test
Buchner Funnel  ,,
  Test     , -  ;;

Filter Leaf
  Test
PH



Chlorine Residual

BOD


Turbidity

MPN Coliform
Proper choice of coagulant and optimum
  coagulant dosage

Optimum chemical dosage for
-•' sludge dewatering

Measure .effects of chemical dosages,
 ; fabrics, and drying time oil vacuum
 •. filter yield

Measure acidity or basicity of
  wastewater for proper neutralization
  and control of. chemical additions

Proper control of chlorine dosage

 Control of methanol dosage in
  denitrification

 Control of filter aid dosage

 Control of chemical addition for
  disinfection
 Reference  for
Test Procedures

Ref. 7-Page 256
Ref. 7-Page 258
Ref. 8-Page 109
Ref. 6-Page 460
Ref. 5-Page 512
Ref. 6-Page 318
Ref. 5-Page 520
Ref. 6-Page 543
Ref. 5-Page 518

Ref. 6-Page 132

Ref. 6-Page 875
Ref. 5-Page 524
                                     25

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                          TABLE 10
                  Chlorine Dosage Ranges
Wastewater To Be
  Disinfected

Raw sewage
Raw sewage (septic)
Settled sewage
Settled sewage (septic)
Chemical precipitation effluent
Trickling filter effluent
Activated sludge effluent
Sand filter effluent
Chlorine Dosage
     mg/1	

   6 to 12
  12 to 25
   5 to 10
  12 to 40
   3 to 10
   3 to 10
   2 to 8
   1 to 5
                               26

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Coagulants

     The quantity of chemical coagulant needed to obtain good coagulation
varies with time and from wastewater to wastewater.  Aluminum and iron salt
requirements for good phosphorus removal are generally proportional to the
phosphorus concentration, while lime requirements are determined largely by
the alkalinity of the wastewater.  Typical coagulant dosages are:
     Aluminum sulfate
     Ferric chloride
     Lime
     Sodium Aluminate
75 - 250 mg/1
45 - 90 mg/1
200 ;- 400 mg/1
75 - 150 mg/1
     The lime dosage required to achieve a given pH and turbidity and/or
phosphate removal is primarily a function of the wastewater alkalinity and is
relatively independent of the influent phosphorus concentration.  In general,
phosphate removal.increases with increasing pH.  Essentially all orthophos-
phate is converted to the insoluble form at pH greater than 9.5.  The actual
pH that will be required to precipitate a given amount of phosphate, and
the amount of lime addition that will be required to raise the pH .to the
desired level  will vary with the specific wastewater composition.  These
parameters should be determined by laboratory jar tests  (See Ref. 7,page 256).
Figure 2  illustrates the relationship between alkalinity and the lime dosage
required to achieve a pH of 11.  With high alkalinity wastewater, a pH of '9.5
to 10  can result in excellent phosphorus removal.  Unless a high pH is used,
waters with low alkalinity (150 mg/1 or less) form a poorly settieable floe.

     It should be noted, however, that lime precipitation of phosphorus
may require filtration to insure continuous compliance with effluent require-
ments.  Even at a process pH as high as 11.4,  high residual phosphorus
may appear in the effluent.  Although high pH values insure that virtually
all phosphorus is insolubilized, effluent total phosphorus is determined by
suspended solids removal efficiency.  Where the floe is difficult to settle,
filtration can be used to provide the necessary SS and phosphorus removal.

     The starting point for the determination of  chemical dosages for alum
and other mineral precipitants can be based on phosphorus removal efficiencies
and side reactions. Figure 3   illustrates typical phosphorus reductions with
varying dosages of alum.  Since the optimum dosages cannot be calculated readily
because of the complexity of the reactions involved, the laboratory jar test
should be used to determine actual chemical requirements.


     Dosage requirements for sodium aluminate are similar to alum.  In general,
dosages in the range of 75 to 150 mg/1 will be required.  In wastewater
treatment  sodium aluminate dosage more often is  determined by phosphorus re-
moval requirements than by suspended solids considerations.

      Because iron salts  react with the natural alkalinity of  the wastewater,
 the dosage requirements  for optimum coagulation using ferric  chloride or
                                    . 27

-------
   500
1  400
ii
™  300

I
H
J3


g


w
   200
                 I
                                             I
       0       100       200       300       400


            WASTEWATER ALKALINITY, mg/1 as
                                                      500
  Figure 2ป   Lime dosage as related to wastewater alkalinity.
                              28


-------
25 -.
                T	1—-T	T	1	r
          20    40    60    80    100   120    140
              ALUMINUM SULFATE DOSAGE,  mg/1
Figure 3.  Typical phosphorus reduction with  alum.    -
                            29

-------
ferric sulfate may be in excess of theoretical levels.  If natural alkalinity
is not sufficient it may be necessary to add alkalinity in forms such as lime
or soda ash to the wastewater.  In addition, the use of iron salts will
result in some pH depression in the wastewater.  This effect will vary with
coagulant dosage and wastewater characteristics.  As with the other coagulants
discussed in this section, optimum dosages are best determined by laboratory
jar tests.


Coagulant Aids

     Coagulant aids or flocculants are often used to enhance the efficiency
of coagulants.  Typical dosage ranges for various coagulant aids are shown
below; however, jar testing is recommended to determine optimum dosage.
     Bentonite
     Activated silica
     Polymer
3-20 mg/1
5-25 mg/1 (as (Si02)
0.1 - 0.25 mg/1
     Caution should be exercised in using coagulant aids, particularly
polymer, since overdosing can restabilize solids and make them very difficult
to settle out.

Filter Aids

     A major element in optimizing filter performance is the use of an
appropriate amount of filter aid (polymer and/or alum).


     The amount of  filter aid needed  increases with  lower water  temperature,
high flow  rates through  the  filters,  and higher applied water turbidities.
The optimum dosage  of filter aid is that which causes the maximum desired
filter  headless to  be reached just as turbidity breakthrough is  about to
occur.  Too much  filter  aid  shortens  the length of filter runs,  and too
little  will allow turbidity  breakthrough before the  maximum allowable
headless is reached.

     When  lime is the primary coagulant, it is usually desirable to use
some alum  (5  to 20  mg/1) as  a filter  aid even when a polymer is used.  When
used as a  filter  aid, typical polymer dosages may range from 0.01 to 0.1 mg/1
depending  on  turbidity tests of the effluent.

pH Adjustment

     One of the most common  types of  chemical treatment used in wastewater
treatment  plants  is pH adjustment.  Wastewaters that are highly acidic or
highly  alkaline are objectionable in  collection systems, treatment plants,
and natural streams.  pH adjustment is simply the raising or lowering of a
pH to a more  desirable value by the addition of chemicals.
                                     30

-------
     Alkaline reagents used to treat acidic wastes vary in the quantity of
acid they are capable of neutralizing.  For comparison each alkali can be
assigned a "basicity factor."  This factor is the weight of a specific alkali
equivalent in acid neutralizing power to a unit weight of calcium oxide (CaO) .
Basicity factors for the more common alkaline reagents are shown in Table 11.  : :
To use Table 11, the neutralizing capacity as well as solubility of the chemical
must be considered when comparing alkaline reagents.  Also, there is no direct
relation between pH and acidity.  In order to adjust the pH of an acidic
wastewater, a titration curve must be constructed. (See Ref. 6) The acidities,- as mg/1
CaCOs, are determined from the titration curve for any desired pH level.
Finally^ to determine the amount of base required to neutralize the wastewater
to a pH of 7.0, the acidity, as mg/1 CaCO^, at the pH 7.0 endpoint must be
known.  The concentration factors for the various alkaline reagents shown
in Table 11 can then be used to design the chemical feed system.
      In some cases, it may become necessary to adjust the pH of a wastewater
 stream downward.   Discharge of effluents with pH greater than 8.5 is generally
 undesirable and in many cases not allowed.  To lower the pH, carbon dioxide
 or acid, may be added to the wastewater.  As in the case of acid neutralization,
 a titration curve is necessary to determine the acid requirements for
 neutralizing alkalinity.  To neutralize 1.0 mg/1 of alkalinity the dosages
 of 100 percent acid required would be:

           Sulfuric Acid (I^SOij)       0.98 mg/1
           Hydrochloric Acid (HC1)     0.72 mg/1
           Nitric Acid (HN03)          0.63 mg/1
 Because these acids are available in different strengths, these figures
 would need to be adjusted by a dilution factor depending on acid strength.
 (Table 11).

 Sludge Conditioning                                                     ,  ,

      The most common chemical conditioning method for sludge is the use
 of inorganic chemicals such as ferric chloride, ferrous salts, lime, or
 aluminum salts.  More recently, organic polymers have been used.  Feed rates
 for chemical conditioning ot sludges are extremely variable depending on the
 process used, nature of the sludge, and type of chemical.  Typical ranges
 for dosages are shown in Table 12..

      Because of large variations in sludges and their properties, it is
 recommended that either a Buchner Funnel or filter leaf test be conducted
 to determine the best chemical and optimum dosage.  These tests are described
 in  Reference 7, page 258 and Reference 8, page 109, respectively.  Through the  use
 of these tests , various chemicals and combinations of chemicals can be tried
 in the laboratory to establish the full-scale chemical dosages.  Laboratory
 tests generally will define the chemical dosage and operating characteristics
 of a dewatering unit within 15 percent of the range established for the full-
 sized facility.
                                    31

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                               "TABLE 12
            Typical Chemical Dosages for Sludge Conditioning
    Sludge Type
                                     FeCl3,
                                     ib/fcpn
                                      dry-.  ;.
                                     Solids
             Lime,
           Ib CaO/ton
             Solids
             Polymer,
              Ib/ton
               dry
              Solids
Raw primary + waste
    activated sludge
40-50
110-300
15-20
Digested primary + waste
    activated sludge
80-100
160-370
30-40
                                    33

-------
 Chemicals for Other Uses

     There are many other  chemicals and uses for chemicals in addition to
 those already presented in this section of the manual.  Table 13 provides
 a summary of uses and average dosages of several chemicals which are
 commonly used by operators to solve plant problems.  As with other chemical
 uses, the operator must consider the effect of these chemicals on subsequent
 treatment units.


 SLUDGE CONSIDERATIONS

     Chemical addition can result in a noticeable difference in overall
 sludge characteristics.  For example, when lime or metallic salts are added
 to processes in a wastewater treatment plant, a new source of sludge is
 produced.  Depending on where the chemicals are added, increased quantities
 of primary or secondary sludges may occur.  Also, the ratio of primary to
 secondary sludge will be affected by the use of chemicals.  For example,
 if lime or a mineral salt  is added to the primary settling tank, floe
 production and solids capture will be increased.  Because of this increase
 in primary sludge, the ratio of primary to secondary will be increased.
 This can result in a noticeable difference in overall sludge characteristics
 at the treatment plant.  As will be explained in the following paragraphs,
 it is not only the quantity, but also the dewatering characteristics of
 the sludge that are important.

 Sludge Quantities

     In chemical precipitation,  the pounds of sludge produced per million
 gallons of wastewater treated can vary considerably.   Data on production of
 sludges for chemical treatment at various points in a secondary plant are
 summarized in Tables 14 through 16-  It is difficult to obtain a true
measurement of sludge quantities in laboratory tests because of solids loss
 during decanting and other procedures.   It is possible, however, to estimate
 the weight of sludge solids by calculating the sum of the expected solids
 removal and the precipitation products expected from the chemical dosage
applied.   Jar tests generally can be used to obtain the necessary information
 for this calculation.
                                   34

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                                 TABLE 13
                          Chemical Dosage Guide
     Chemical

Activated Carbon
Chlorine
Copper Sulfate
Hydrogen Peroxide

Methanol
Ozone
Polymer
 Sulfur dioxide
      Use

Organics Removal
TF flies and ponding
Bulking sludge
Breakpoint chlorina-
  tion (N-removal)
Odor control
Prechlorination
Lagoon algacide
Bulking sludge
Odor control
Denitrification
Odor control
Scale prevention
  (in stripping tower)
Improve  sand  drying
  bed
Dechlorination
  Average Dosage

250-1,800 Ib/mil gal
0.5-1.0 mg/1 residual
5-60 mg/1
10 mg/1

1 mg/1 residual
2-5 mg/1  '"'
5-10 Ib/mil gal
50-200 mg/1
1-1.5 mg/1 per 1 mg/1 H2S
3 methanol:   1 nitrate-N
1-2 mg/1  (by  volume of air treated)
0.5-5.0 mg/1

5-30 Ib/dry ton

 1 mg/1  SOo  per  1 mg/1  Cl2 residual
                                    35-

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                                  TABLE 15

  -,   Additional Sludge to be Handled with Chemical Treatment Systems:

       Mineral Addition to Aeration Basin for Removal of Phosphorus
Sludge Production
    Parameter
                          Alum Addition to
                           Aeration Basin*

                      Conventional   With Alum
                       Secondary      Addition
                                                     Fe3+Addition to
                                                      Aeration Basin
           Conventional
            Secondary
                                                                         3+
With Fe
Addition
Level of chemical
  addition (mg/1)
                            0
                           672
                        384-820
103-253


  1.12
                                                        0
Percent sludge solids
  Mean                     0.91          1.12         1.2
  Range                0.58-1.4       0.75-2.0      1.0-1.4

Ib/mil gal
  Mean
  Range

gal/mil gal
  Mean
  Range
  10-30
                                                                     1.3
                                                                   1.0-2.2
 1,180         1,059         1,705
744-1,462    218-1,200    1,100-2,035
                         9,100          13,477         10,650         18,650
                       7,250-12,300   7,360-20,000   10,300-11,000  6,000-24,000
 * MW of Alum:   A12(S04>3 •  14H20 = 594
                                     37

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                             TABLE 16
 Additional Sludge to be Handled with Chemical Treatment Systems:
Mineral Addition to Secondary Effluent for Removal of Phosphorus
                                                                +3
Sludge
Production Parameters
Level of chemical
addition (mg/1)
Percent sludge solids
Mean
Range
Ib/mil gal
Mean
Range
gal/mil gal
Mean
Range
Lime
Addition
268-450
1.1ฐ
0.6-1.72
4,650
3,100-6,800
53,400
50,000-63,000
Alum
Addition
200
1.0
568
6,810
Fe
Addition
10-30
1.0
507
175-781
6,080
2,100-9,400
                               38

-------
     There are several computation methods available  to  estimate sludge
quantities produced by chemical addition.  EPA Technology  Transfer Process
Design Manual for Phosphorus Removal Qtef. 4)describes several methods and
provides detailed procedures for estimating chemical  sludge  quantities.
Other procedures are outlined in EPA Technology Transfer Manual, Physical-
Chemical Wastewater Treatment Plant Design  (Ref.  10)  and are reproduced"
in Tables 17 through 19 in this manual for easy reference.   The basic
equations needed to perform the calculations  shown  in Tables 17 through 19
are as follows:   ;  '•'  >  -      ;    	,'  r •   -...'•.;-  -.:-  : ;.    :  ;"(1.=  -.,•.,•.•..'•:
              t3~ 4- 5Ca2+ + OH~  -> Ca5OH(POtt)34-                  (1)
              Mg2+ + 20H- .-*• Mg(OH)24-                           (2)
              Ca2+ + C032~ •ป• CaC03i                             (3)
          CaC03 18QฐฐF  CaO + C02t (incineration)               (4)
              CaO + H20  -> Ca(OH)2                              (5)
          t-   A13+ +'POt('3-. -> AlPO^^-        .                    (6)
              A13+ + 30H~ -> A1(OH)34-                           (7)

          2Al(OH)o ^QQ01*  A1203 + 3H20   (incineration)       '  (8)
              Fe3* + PO^3"  ->- FeP04-l-                            (9)
              Fe3+ + 30H~  -> Fe(OH)34-                          (10)
          2Fe(OH)3 —n	  Fe203  + 3H20   (incineration)       (11)
              Z coagulant in = ฃ coagulant out                 (12)
        Processabilitj
     In every case where chemical treatment is used, there are waste chemical
 sludges or mixtures of biological and chemical sludges requiring disposal.
 Many methods of disposal however, involve dewatering the sludge prior to
 final disposal.  The.ease with which sludge may be dewatered should be a
 consideration in chemical selection.

      There may be some benefits  in  the dewatering and drying of biological
 sludges containing alum.  In tertiary treatment, alum and iron coagulants
 generally produce gelatinous floe which  is difficult and expensive to dewater,
 On the other hand, lime coagulation produces a sludge which is much easier to
 thicken and dewater.  The quantity  and nature of organics present  in the
 chemical sludge may alter significantly  its dewatering characteristics..
 For example, the presence of large  quantities of activated  sludge  solids
 may make the dewatering of  lime  sludges  much more difficult than  lime sludge,
 alone.

      Methods and equipment  ordinarily used in handling and  processing
 biological  sludges are generally applicable to chemical  sludges  or chemical-
 biological  sludge mixtures.  Gravity or  flotation  thickening may be used,
 and dewatering may be achieved by use of drying beds,  lagoons,  centrifuges,
 vacuum filters,  filter presses,  or  horizontal belt  filters. The important
 points to be considered, however, are:
                                    39

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                                         TABLE 17

                        Estimate of  Lime  Sludge Quantities
Raw sewage suspended solids
Raw sewage volatile suspended solids
Raw sewage PO43~
Raw sewage total hardness
Raw sewage Ca2+
Raw sewage Wig2"1"
Effluent PO4
Effluent Ca2+
Effluent Mg2+
250 mg/l
150 mg/l
11.5 mg/l asP
170.5 mg/l as CaCO3
60 mg/l
5 mg/l
0.3 mg/l as P
80 mg/l
0
Lime dosage

  From equation 1
  From equation 2
  From equation 12
  From equation 3
400 mg/l as Ca(OH)2 or
216 mg/l as Ca2+
Ca5OH(PO4)3 formed is 1 mole per 3 moles P
 11.2
                                   30.97
                                        = 0.365 mole P removed
         n ^RR
Therefore -^—• or0.122 mole Ca5OH(PO4)3 are formed; fw is 502

Therefore weight is 0.122X 502 = 61 mg/l as Ca5OH{PO4)3
Mg(OH)2 formed is 1  mole per mole Mg2+
  5
Therefore 0.206 X 58.31 = 12 mg/l as Mg(OH)2
Ca2+ in = Ca2* out; Ca2+ in = 60 + 216 = 276
Ca2+ content of Ca5OH(PO4)3 formed = 5 X 40 X 0.122 = 24 mg/l
Ca2+ lost in effluent = 80 mg/l
Therefore Ca2"1" not accounted for = 276 - (80 + 24) = 172 mg/l
CaCO3 formed is 1 mole per mole Ca2+
          172
Therefore  -7^- = 4.3 moles CaC03; fw = 100

So weight of CaCO3 = 430 mg/l
                                      Sludge composition
Sludge species
Raw sewage solids
Ca5OH(P04)3
Mg(OH)2
CaCO3
Total
Total weight
250 mg/l = 2,080 pounds per million gallons
61 mg/l = 510 pounds per million gallons
12 mg/l =100 pounds per million gallons
430 mg/l = 3,600 pounds per million gallons
6,290 pounds per million gallons
Ash
Pounds per million gallons
832
510
100
2,020
3,462
                                          40

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                     Estimate  of Alum  Sludge Quantities
Raw sewage suspended solids
Raw sewage volatile suspended solids
Raw sewage PO43~
Raw sewage total hardness
Raw sewage Ca2+
Raw sewage Mg2+
Effluent P04
Effluent Ca2+
Effluent Mg2+
Effluent AI3+              :
250 mg/i
150mg/l
11.5mg/lasP
170.5 mg/l as CaCO3
60 mg/l
5 mg/l
0.3 mg/l as P
60 mg/l
5
0
Alum dosage
   From equation 6
   From equation 12
   From equation 7
200 mg/l as AI2(SO4)3-14H2O - fw = 594
AIPO4 formed is 1 mole per mole of P
 11.2
                                          30.97
                                                = 0.365 mole P removed
Therefore 0.365 mole of AIPO4 are formed; fw is 122
Therefore weight is 0.365 X 122 = 44 mg/l
AI3+ in = AI3+ out; AI3+ in = 18.1 mg/l
AI3+ content of AIPO4 = 0.365 X 27 = 9.9 mg/l
AI3+ not accounted for = 18.1 - 9.9 = 8.2 mg/l
AI(OH)3 formed is 1 mole per mole AI3+

Therefore || = 0.31 mole AI(OH)3; fw = 78

So weight of AI(OH)3 is 0.31 X 78 = 24 mg/l
                                Sludge composition
Sludge species
Raw sewage solids
AIPO4
AI(OH)3
Total
Total weight
250 mg/l = 2,080 pounds per million gallons
44 mg/l = 368 pounds per million gallons
24 mg/l = 200 pounds per million gallons
2,648 pounds per million gallons
Ash
Pounds per million gallons
832
368
133
1,333
                                         41

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                                       TABLE  19

                      Estimate  of Iron  Sludge Quantities
Raw sewage suspended solids
Raw sewage volatile suspended solids
Raw sewage P043~
Raw sewage total hardness
Raw sewage Ca2+
Raw sewage Mg2+
Effluent P04
Effluent Ca2+
Effluent Mg2+
Effluent Fe3+
250 mg/l
150mg/l
11.5 mg/l as P
170.5 mg/l as CaCO3
60 mg/l
5 mg/l
0.3 mg/l as P
60 mg/l
5
0
FeCI3 dosage
  From equation 9
  From equation 12


  From equation 10
80 mg/l
FePO4 formed is 1 mole per mole P

   '   = 0.365 mole P removed
30,9 /
Therefore 0.365 mole of FePO4 are formed; fw= 151
Therefore weight is 0.365 X 151 = 55 mg/l
Fe3+ in = Fe3+ out; Fe3+ in = 28 mg/l
Fe3+ content of FePO4 = 0.365 X 55.8 = 20.4 mg/l
Fe3+ not accounted for = 28 - 20.4 = 7.6 mg/l
Fe(OH)3 formed is 1 mole per mole Fe3+

Therefore  =^r = 0.136 mole Fe(OH),;fw= 107
          bb.o                   ฐ
So weight of Fe(OH)3 = 0.136 X 107 = 15 mg/l
                                 Sludge composition
Sludge species
Raw sewage solids
FeP04
Fe(OH)3
Total
Total weight
250 mg/l = 2,080 pounds per million gallons
55 mg/l = 460 pounds per million gallons
15 mg/l =122 pounds per million gallons
2,662 pounds per million gallons
Ash
Pounds per million gallons
832
460
105
1,397
                                      42

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                                ._ .-.A-fs-V       ---?
 e   Greater  solids  production results from chemical usage.

 ป   Greater  solids  production will have an impact on  sludge handling and/
     conditioning unit processes.

 .   Operation and maintenance difficulties may be significantly different
     with sludges containing  large  quantities  of  chemicals.

Finally, it is recommended that appropriate laboratory and pilot tests be
used in determining the most effective and economical methods of sludge
processing.                                                ,   ,

     Another consideration in chemical sludge handling is the possibility
of chemical recovery and reuse.   For example, lime sludges can be recalcmed
and reused, but  there is no method  currently available for recovery and
reuse of  iron salts.  In cases where sodium aluminate is a good coagulant,
the alkaline method for alum recovery may be used   If laboratory testing
shows sodium aluminate to be an unacceptable coagulant for the wastewater
under consideration,  then the  acid  method for  alum recovery may be used when
the  treatment goal  is  suspended solids  removal.   On the other hand,  the acxd
recovery  "Shot  is  not applicable  if one of the  treatment  goals is phosphorus
removal.               -  •

     In many cases, sludge handling techniques may be too  complex for  the
operator  alone to evaluate effectively.  The  services of a consulting
engineer  would be most valuable in  assessing  the situation, recommending a
solution,  and designing the  necessary components of the system.


 Sludge Disposal                                                       ^

      Sludge disposal  is perhaps the most important factor governing the
 choice of chemicals.  In locations where there  are available large, remote
 areas  of land,  almost any kind of  sludge, wet or  dry, stable or decomposing,
 can be,  and is,  disposed of by hauling or pumping to these land disposal
 sites.  In many places, however,  this  method  for  sludge disposal probably
 will not be allowed  indefinitely  and other alternatives will have to  be
 developed.

      Alum and iron sludges  usually can be  added to anaerobic digesters.  The
 higher digester loadings resulting from additional sludge production  usually
 will not upset  the operation unless an organic  overloading  condition  exists.
 Release of  soluble phosphorus from the sludge during digestion is minimal.
 Final  disposal  of  the digested sludge  can be on land, in  a landfill,  or by
 dewatering  and'incineration.

      Alum,  iron, and lime  sludges can  be  disposed of directly  onto  land, but
 at warm temperatures, alum and iron  sludges  may need lime treatment to
 prevent d.dors.
                                     43

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     In large systems, sludge thickening or dewatering prior to lagooning
or incineration should be considered.  Sludge incineration, particularly
for' large cities, has the advantage of converting organic solids to ash, thus
reducing the weight and volume of solids.  Alum, iron and lime sludges can
be effectively incinerated.

     The operator may find it useful to refer to EPA Technology Transfer
Manual, Process Design Manual for Sludge Treatment and Disposal, (Reference 9)
The manual presents a review of sludge processing techniques and procedures
for selecting optimum designs.
                                   44

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                    i.	t.i-i'kt-  31 --J
                   d.^ 3ac" f let;,?
          SECTION 3

SELECTING CHEMICAtiS FOR USE

-------

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                                  SECTION 3

                         SELECTING CHEMICALS FOR USE


     There are many different chemicals which can be used in practically
every phase of wastewater treatment.  As water quality and wastewater treatment
requirements continue to become more stringent, the role of chemicals in
improving or maximizing wastewater treatment plant performance becomes
increasingly important.  Often there is more than one chemical that can be used
for a particular problem.  In every case, there are advantages and disadvantages
associated with each chemical as well as other factors which will influence
the operator's choice of chemicals. .General factors to consider in selecting
chemicals include:

   ซ Effectiveness
   • Cost
   ซ Reliability of supply
   • Sludge considerations
   • Compatibility with other treatment processes
   ซ Environmental effects

     There are a number of references available to the operator which provide
detailed information on chemical use in relation to the above factors.
Principal references include the following:

     1.  Operation of Wastewater Treatment Plants, Manual of Practice No. 11,
         Water Pollution Control Federation, 1976.

         The manual describes techniques of  unit process  operations,  as
         well  as  corrective measures regarding process problems.   Improved
         performance and physical-chemical  treatment  techniques are  also
         covered  in the  text.

     2.  Wastewater Treatment Plant Design, Manual of Practice No. 8, Water
         Pollution Control Federation, 1977.

         The manual contains a chapter specifically on chemical treatment,
         including use in coagulation, phosphorus removal, and pH control.
         Mixing and chemical feed systems also are discussed.

     3.  Field Manual for Performance Evaluation and Troubleshooting at Municipal
         Wastewater Treatment Facilities, EPA-430/9-78-001, January  1978.
                                      45

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        This manual describes procedures for evaluating and troubleshooting
        various unit processes commonly used at wastewater facilities.   One
        chapter is devoted to chemical feeding and conditioning, and other
        chapters contain information on the use of chemicals in improving
        process operations.  Procedures for evaluating process efficiencies
        also are included.

    4.  Process Design Manual for Phosphorus Removal, EPA 625/1-76-OOla,
        April  1976.

        Phosphorus removal methods that have been found effective and
        practical are discussed in this manual.  The methods include
        chemical precipitation using aluminum and iron salts, and lime.
        Practical points  for chemical addition also are described and
        documented by case histories.

    5.  Process Design Manual for Suspended Solids Removal, EPA 625/l-75-003a,
        January 1975.

        This manual  describes specific processes and design considerations
        for removal  of suspended solids in municipal wastewater.  Detailed
        information  also  is provided concerning the handling and application
        of  coagulant chemicals.

    6.  Process Design Manual for Upgrading Existing Wastewater Treatment
        Plants, EPA  625/l-71-004a, October 1974.

        The capabilities, limitations and  interrelationships of various unit
        processes are examined in this manual with considerable emphasis  on
        the use of chemicals in upgrading  treatment facilities<

    7.  Process Design Manual for Sludge Treatment and Disposal, EPA 625/1-79
        -Oil,  September  1979.

        Emphasis  is  placed  on operational  considerations  and  interrelationships
        of  various  sludge treatment processes  including chemical conditioning
        of  sludges.


EFFECTIVENESS

     One of the first considerations in the selection of chemicals  is the
degree of effectiveness which can be expected from the chemical addition.
As an aid i'n predicting effectiveness,  it is very helpful  to obtain information
on experience and operating results from full-scale plants at other locations.
However, caution should be exercised in using such data from other plants;
the operator should not assume that a certain chemical used at one plant
will produce identical results at a different plant.   The operation of many
treatment plants often is unique and chemicals chosen for use must be able
to handle these variations in performance and still produce an effluent of
uniform quality.  The effectiveness of a particular chemical varies in
different applications and often depends on operating conditions.
                                     46

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     In order to have a better idea of the expected results of chemical
addition, laboratory and/or pilot tests using the proposed chemical should
be performed.  The. objectives of laboratory studies usually are:   (1) to
determine whether or not the wastewater or sludge may be successfully
treated by the proposed chemical, and (2) to obtain data for the design
and operation of pilot and full-scale facilities.  After eliminating
alternative chemicals which do not produce satisfactory results on the
           . ' •" .  . v"ป.,, " •• iป \' -'  i--^?ซ-  -1: ,. . • f L -. T,, ,   , , ,   „     .      - ,
basis of 'laboratory studies, aicost comparison should be performed to
select from the remaining chemicals.  It should be recognized, however,
that laboratory and pilot tests do not always adequately evaluate  sludge
problems orfproblems associated with recycled process streams -or return
solids.  It!isronly at plant-scale that many of the real operational
problems become completely evident.      '                     "•
     More detailed information on chemical effectiveness is provided  in
Section 2 of this manual.
                                            ''
COST    ^  ...  :..:,-.-,;,-*,,  -',.!..  -  -'--.-.   .-.- ,  -'            '

     Another factor  in chemical selection is  cost - both  capital and  oper-
ating.  Capital costs for handling and feeding various  chemicals can  vary
considerably depending on the  characteristics of the  chemical  to be fed,
the form  (liquid, powder, gas) in which the chemical  is purchased, and  the
form in which the chemical ultimately is  used in the  treatment process.
Costs will be higher for chemicals which  require special  handling materials
for storage, feeding, piping and accessories, and sophisticated pacing  and
control equipment.   The appendix of this  manual provides  a  ready reference
for information on each chemical, its available forms,  cost, storage,
feeders,  and acceptable handling materials.   The costs  quoted  in the  appen-
dix were  obtained from the November 5, 1979 issue of  the  Chemical Marketing
Reporter.  These costs are presented only for guidance  and  are subject  to
significant variations due to  local market conditions.  Transportation  is
a  significant cost for some locations.  Cost  quotations for the chemicals
being considered should be obtained from  the  manufacturer or supplier
prior to  final chemical selection.

     The  cost at point of origin usually  is quoted by the manufacturer  in
cents or  dollars per pound, per 100 pounds, or per ton, and varies according
to the  size of the order.  It  may be a price  "f.o.b.  cars"  at  the point of
manufacture or at a  regional stock point. When small lots  are purchased,
the f.o.b. point is  important  since the manufacturer  ships  to  the regional
stock point in bulk  at lower rates in order to give the customer the  benefit
of this savings.  The point of shipment origin should always be clearly stated
since transportation costs on  low-priced  materials may  actually be in excess
of the  cost of the material, especially if long hauls are involved.   The
manufacturer should  supply this information,  if it is requested by the
customer.

     Many manufacturers quote  prices "f.o.b." from a  distribution point but
also will give the customer information on the expected cost of transportation

                                    47

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by rail or truck  to the point of usage.  Sometimes, manufacturers will
also quote "freight allowed," which means that they will assume the freight
charge on the shipment.  In small shipments, it is important to compare
the cost of shipment by truck to the cost of shipment by rail.  While the
truck rate may be higher than the rail rate, the material will be taken
from the manufacturer's plant and delivered to the door of the plant at no
extra cost.  On the other hand, by rail, even though the price given is as
"f.o.b. your nearest freight station," there will be extra costs for
handling and hauling of the material from the freight station to the plant.
Therefore, the overall delivered cost may be less by truck.  These factors
should be considered in determining chemical costs.

     In comparing the economics of various  chemicals, one must not only
consider the relative quantities of chemicals needed, but also the rela-
tive cost of handling the resulting sludges.  For example, the cost per
pound of lime is typically lower than that  of alum, but larger dosages of
lime generally are needed to achieve the same results as alum for waste-
water coagulation.  Clearly, a complete cost analysis including all of the
system variables is necessary to determine  which of the two chemicals is
most economical.

     Table 20 shows an example of a typical cost evaluation for two differ-
ent chemical disinfection systems for a 5-mgd plant.  The cost comparison
shows both capital and annual costs for disinfection using chlorine and
ozone.  In this analysis the predominant factors responsible for the higher
cost of ozonation are the capital cost and  energy usage.  Unit costs
assumed in this analysis include labor at $9.00/hr, and energy at $0.03/kwh.
In other situations the cost analysis may show nearly equal capital costs
for several alternative chemicals.  For example, in comparing various
coagulants, the capital costs may be very close, but operation and maintenance
costs may vary significantly depending on chemical  dosages, unit chemical
costs, sludge effects, and chemical handling costs.

     Cost considerations also should include the possibility of using a
single chemical for more than one purpose.  For example, it may be more
economical to use a single chemical such as chlorine for odor control,
control of bulking sludge, and disinfection, rather than to use a different
chemical for each of the three operations.  The possible cost savings for
such multiple usage can only be determined  through  a detailed cost analysis
of the various alternatives.


RELIABILITY  OF SUPPLY

      Reliability  of supply  is  perhaps  as  important  as  effectiveness  in
selecting  chemicals.   There  is  little  advantage  in  selecting  a  chemical
which satisfies  all the requirements  in a  treatment process if  the chemical
is not readily available.

      Regardless  of  the chemical  used,  there must be a  sufficient  supply  on
hand  at  all  times to  cover  the treatment plant needs  for daily operation
                                    48

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                                   TABLE 20

                        ..... Example Cost Comparison of
                           Disinfection Alternatives

                             .  for a 5-mgd Plant
Capital Costs

Annual Costs
     Labor
     Energy
     Maint. & Material

     Amortized Capital

TOTAL ANNUAL
                                  Chlprination
                   $235,000
                     12,000
                      2,000
                     27,000

                     21,970
                   $ 62,970
                                           Ozonation
$510,000
   8,200
  56,000
   7,800

  47,680

$119,680
ASSUMPTIONS:
Chlorine dosage, 5 mg/1
Chlorine contact time, 30 minutes
Liquid chlorine cost, $250/ton
Ozone generation from air
Ozone dosage, 10 mg/1
Ozone contact time, 15 minutes
Amortization rate, 20 yrs @ 6-7/8%
                                    49

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plus enough to cover the time between order placement and receipt of the
material.  It is best to allow a reasonable factor of safety to overcome
delays in shipment or transportation, especially if the chemical is to be
transported long distances.

     Another important consideration is the length of time a chemical
will retain its full potency.  This factor has a definite effect on the
amount of chemical to be purchased and delivered at any one time.  If the
manufacturer states that the raw material will retain its full potency six
months, then it would not be economical to purchase it in quantities which
would last much longer.   If potency will last for a year,  it may
be more economical to purchase the chemical in quantities sufficient to last
for that period.  In most cases there is a differential in price for purchases
in large lots, particularly for higher priced items.  But when large quan-
tities are ordered to last over long periods, adequate provision must be
made for proper storage facilities.  Depending on the characteristics of
the selected chemical, the cost of such storage facilities may add
considerably to the overall cosฃ of the item.

     To avoid or minimize potential problems in obtaining chemicals,
suppliers of the specific chemical should be contacted for details on
chemical availability before the chemical is selected for use in the
treatment plant.  The Appendix can be used to identify major manufacturers
and suppliers of various chemicals, and to provide information on typical
shipping containers and quantities.

     It is also advisable to consider market trends for wastewater treatment
chemicals to anticipate possible chemical shortages or large cost increases.
The market for wastewater treatment chemicals has expanded during the last
decade and will probably continue  to grow in future years.  Both municipal-
ities and industries will continue to improve and expand their treatment
facilities to meet the more stringent effluent standards now in existence.
This will result in increasing demands  for wastewater treatment chemicals.
 SLUDGE CONSIDERATIONS

      Selection of  a treatment chemical  and point  of  application  should  take
 into  account  the relative sludge mass,  and the  ability  to  process and
 dispose of  the additional solids.

      The increase  in sludge production  depends  primarily on  the  chemical
 used  and the  point at which it is  applied in the  treatment process.  The
 resulting sludge can be handled by several conventional methods, but
 sludge characteristics  such as dewatering and digestion characteristics
 may change.   Section 2  of this manual contains  more  detailed information
 on sludge quantities, processability and disposal.
                                   50

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COMPATIBILITY WITH OTHER TREATMENT PROCESSES

     Another consideration in chemical selection is compatibility with other
processes used in the overall treatment scheme.  The possible effects on
waste  streams or recycled solids also are very important.


     Due to variations in wastewater characteristics and treatment plant  design
and operation,  the choice of chemical and point of chemical addition will have
varying effects on other plant processes.   These effects are best determined
in two steps:  a laboratory feasibility study followed by pilot tests or  by
full-scale plant tests,  if possible.  The laboratory study should provide a
preliminary evaluation of various chemicals to determine their general
effectiveness and estimated dosage.   Pilot or full-scale plant tests then
should provide more detailed information on overall compatibility with other
plant processesr  Additional guidance on chemical dosages is provided in
Section 2 of this manual.


ENVIRONMENTAL EFFECTS

     As more stringent discharge requirements are initiated and  enforced,
additional  consideration should be given to choosing chemicals which will
be  environmentally safe upon final disposal.  For example, the most econo-
mical  and widely accepted disinfectant for wastewaters  is  chlorine.  How-
ever,  because chlorine has been implicated in the formation of cancer-
causing substances, there may be situations where ozone becomes  a preferred
disinfectant.  But because of costs, high energy requirements, and the
fact that ozone provides no residual protection, the use of ozone normally
is  not recommended unless unusual environmental concerns exist.

     There  are a number  of other groups of chemicals in which  selection
may be influenced by  environmental effects.  Table  21 provides examples
of  such chemicals and the reasons why they may be considered environmentally
undesirable.

      In  order  to  minimize  problems  of  this nature  it  is best  to  consult  with
 the appropriate local regulatory agency before making firm plans to  use  a
 chemical  which may have undesirable impacts  on the  environment.


 LABOR REQUIREMENTS

      In selecting chemicals and chemical feeders,  consideration  should be
 given to  labor requirements with respect to  feeding and handling of  chemicals
 and equipment  operation and maintenance.   It is important to  recognize  that
 labor associated with various chemicals  depends not only on the  particular
 chemical,  but  also  on the characteristics of the chemical and the form in
 which it is purchased,  stored,  and  fed.   For example,  less labor generally
 will be required to  use a chemical  which is  both purchased and fed in the
 same form  than a chemical which is purchased in dry form, dissolved for
                                    51

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                           TABLE 21
        Environmental Effects of Chemical Discharges
Chemical
Ammonia
Alum or
Iron salts

Chlorine
Chlorine
Potential Use

Control  of pH or
alkalinity
Coagulation
Disinfection
 Breakpoint
 chlorination  for
    removal
Methanol
 Carbon  or  food
 source  for bacteria
Environmental Effect

Upon discharge, high ammonia
concentrations can be toxic
to fish, deplete oxygen in
receiving waters and en-
courage algae growth.

Increases effluent TDS.
Increases sludge.

Increases effluent TDS,
high residuals can be
toxic to fish..

May produce acidic effect
on effluent, requiring
addition of another chemi-
cal for neutralization.
Increases chlorides in
effluent.

If overdosed, methanol
could be discharged in
plant effluent, resulting
in higher BOD.
                               52

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storage and later  diluted for feeding.  Table 22 illustrates the wide
variation in operation and maintenance labor for several commonly used
chemicals for sludge conditioning.  These figures show typical labor require-
ments for unloading, storing and feeding operations.  The primary components
which cause high labor requirements for unslaked lime are operation and
maintenance related to the slaking and feeding equipment.  As Table  22
illustrates, there can be considerable difference in staffing requirements
for various chemicals, and these differences should be considered in
selecting chemicals.
                                     53

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                              TABLE 22

             Chemical Treatment Labor Requirements
      Chemical
Ferric chloride
Lime (slaked)
Lime (unslaked)
Polymer (dry)
Polymer  (liquid)
Capacity,
  Ib/hr

     10
     50
    100
    500

    100
    500
  1,000

    100
    .500
  1,000

     .5
    1.0
    5.0
   10.0

     .5
    1.0
    5.0
   10,0
Operation & Maintenance
     Labor, hr/yr	

           150
           210
           300
           800

         1,800
         1,850
         2,100

         2,400
         2,400
         2,900

           500
           580
           750
           850

           390
           400
           420
           440
   Labor for operation and maintenance of unloading, storing and
   feeding facilities.
                                 54

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          SECTION 4




FEEDING AND HANDLING SYSTEMS

-------

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                                  SECTION 4

                        FEEDING AND HANDLING SYSTEMS
     Feeding systems are necessary for the controlled addition of chemicals
to wastewater, whether the chemicals are solid, liquid or gas.  The design
of a chemical feed system must consider the form of each chemical desired
for feeding, the physical and chemical characteristics of the chemical,
maximum and minimum waste flows, and the reliability of the feeding devices.

     The facilities for chemical feeding are relatively simple and consist of
equipment to store the chemical(s), feed the chemical(s) at controlled dosages,
place the chemical(s) in solution or slurry, arid feed the solution to the
process as shown in Figure 4.
     SUPPLIER
    TRANSPORT
STORAGE +-
CHEMICAL
MIXING
WITH
WATER

i SOLUTION !
~~M FED TO '
| PROCESS j
                Figure 4.  Chemical feeding system schematic.

     In suspended and colloidal solids removal from wastewaters the chemicals
used are generally in liquid or solid form.  Those in solid form are usually
converted to solution or slurry form prior to introduction to the wastewater
stream; however, some chemicals are fed in a dry form." In either case, some
type of solids  feeder is usually required.  This type of feeder has numerous
different forms due  to wide ranges in chemical characteristics, feed rates,
and degree of accuracy required.  Liquid feeding is somewhat more restrictive,
depending mainly on  liquid volume and viscosity.

     The capacity of a chemical feed system is important to consider in both
storage and  feeding.  Storage  capacity design must take into account^the
advantage of quantity purchase versus the  disadvantages of construction cost
and chemical deterioration with time.  Potential delivery delays and chemical
use rates are important  factors which must be considered.  Storage  tanks  or
bins for solid  chemicals must  be designed with proper  consideration of the
angle  of repose of  the chemical and  its necessary  environmental requirements,
such as temperature  and  humidity.  Size and slope  of feeding lines  are
important along with their materials of construction,  since some chemicals
are corrosive  to  certain materials.
                                      55

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     Chemical feeders must accommodate the minimum and maximum feeding rates
required.  Manually controlled feeders have a common range of 10:1, but this
range can be increased to about 20:1 or 30:1 with dual control systems.
Chemical feeder control can be manual, automatically proportioned to flow,
dependent on some form of process feedback, or a combination of any two of
these.  More sophisticated control systems are feasible if proper sensors
are available.  If manual control systems are specified with the possibility
of future automation, the feeders selected should be able to be converted
with a minimum of expense.  An example would be a feeder with an external
motor which could easily be replaced with a variable speed motor or drive
when automation is installed.  Standby or backup units should be included
for each type of feeder used.  Points of chemical addition and piping to
them should be capable of handling all possible changes in dosing patterns
in order to have proper flexibility of operation.  Designed flexibility in
hoppers, tanks, chemical feeders and solution lines is the key to maximum
benefits at least cost.

     Solids characteristics vary considerably and the selection of a feeder
must be made carefully, particularly in a smaller-sized facility where a
single feeder may be used for more than one chemical.  In general, provisions
should be made to keep all dry chemicals cool and dry.  Dryness is very
important, as hygroscopic (water- absorbing) chemicals may become lumpy,
viscous or even rock hard; other chemicals which absorb water less readily
may become sticky from moisture on the particulate surfaces, causing, increased
arching in hoppers.  In either case, moisture will affect the density of the
chemical which may result in under-feed.  Also, the effectiveness of dry
chemicals, particularly polymers, may be reduced.  Dust removal equipment
should be used at shoveling locations, bucket elevators, hoppers, and feeders
for neatness, corrosion prevention and safety reasons.  Collected chemical
dust may often be used along with stored chemicals.  In general, only limited
quantities of chemical solutions should be made from dry chemicals, since the
shelf life of mixed chemicals (especially polymers) may be short.

DRY CHEMICAL FEEDERS

     The simplest method of feeding dry or solid chemicals is by hand.  Solid
chemicals may be preweighed and added or poured by the bagful into a dissolving
tank.  This method is generally limited to very small operations, however,
and dry chemical feed equipment is usually required.

     A dry feed installation (Figure 5) consists basically of a storage bin
and/or hopper, a feeder, and a dissolver tank.  Dry feeders are either of the
volumetric or gravimetric type.  Volumetric feeders usually are used only
where low initial cost and low feed rates are required.  These feeders
deliver a constant, preset amount of chemical and do not recognize changes in
material density.  This type of feeder must be calibrated by trial and error
at the outset, and then readjusted periodically if the material changes in
density.

     Most types of volumetric feeders generally fall into the positive
displacement category.  All designs of this type use some form of moving
                                      56

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          _DUST COLLECTOR
            X2-FILL PIPE (PNEUMATIC)
      BULK  STORAGE
          BIN
DAY HOPPER
FOR DRY CHEMICAL
FROM BAGS OR DRUMS^
                  .BIN.GATE
                  -FLEXIBLE
                   COKHECTION
                      ALTERNATE SUPPLIES DEPENDING
                               ON STORAGE	
                                                           DUST COLLECTOR
                                XBAG FILL
                                                                   -SCREEN
                                                                   WITH BREAKER
DUST AND VAPOR REMOVER
WATER
SUPPLY
FEEDER
                        SCALE OR SAMPLE CHUTE
             DRAIN
       SOLENOID VALVE'
      CONTROL
       VALVE -^ROTAMETER
     PRESSURE REDUCING
           VALVE
                  WATER SUPPLY
                                                 -MIXER
/
-/
DISSOLVER
/,
r
L


^-BAFFLE





                    .LEVEL

1
HOLDING
TANK


PROBES


c
                                       GRAVITY  TO
                                       APPLICATION
                                                                   	_ PUMP
                                                                    TO APPLICATION
                     Figure 5.   Typical dry  feed system.
                                       57

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 cavity of a specific or variable size.   In operation,  the chemical falls by
 gravity into the cavity and is almost fully enclosed and separated from the
 hopper's feed.   The rate at which the cavity moves and is discharged,  together
 with the cavity size, govern the amount of chemical fed.   Positive displacement
 feeders often use air injection to enhance flowability of the material.

 Rotary Paddle Feeder

      An example of a positive displacement rotary feeder is  illustrated  in
 Figure 6.   This rotary paddle feeder is especially effective for  fine  materials
 that tend to flood.   The paddle or vane is located beneath the hopper  discharge,
 with the feed being varied by means of  a sliding  gate  and/or variable  speed
 drive.   The feed rate can be varied easily by adjusting the  variable speed
 drive on the vane shaft.   A variant of  the rotary paddle feeder is the pocket
 feeder,  also called the star or revolving door feeder,  in which the paddle
 is  tightly housed to permit delivery against vacuum or  pressure.

 Oscillating Hopper Feeder

      Another type of volumetric feeder  is the oscillating hopper,  or oscillating
 throat  feeder.   This feeder (Figure 7)  consists of a main hopper  and an
 oscillating hopper which  swivels on the end of the main hopper.   The material
 completely fills both hoppers and rests on the tray beneath.   As  the oscillating
 hopper moves back and forth,  the scraper,  which rests on the fixed tray  below,
 is  moved first  to the left and then to  the right.   As it  moves, it pushes a
 ribbon-like layer of dry  chemical off the tray.   The capacity  is  fixed by the
 length of  the stroke,  which may be varied by means of a micrometer screw.
 Further  adjustment is possible by changing the clearance  between  the hopper
 and the  fixed tray,  which may be raised or lowered.  This type  of  feeder is
 one of the most  widely used in small water and wastewater plants.

 Oscillating Plate Feeder

      In  the oscillating plate feeder a  plate is mounted below  the  bottom
 spout in the storage hopper so that  the chemical  spills out  onto the plate
 as  it comes out  of the  storage hopper.   A leveling bar  is  mounted  above the
 plate on each of the two  ends.   The  plate  is  mechanically linked to the
 drive motor so that  the plate slowly oscillates from side  to side  as the
 feeder operates.   The magnitude of oscillation can be adjusted with the
 mechanical linkage.   This  provides a dosage  adjustment.   Each time  the plate
 oscillates  from  one  side  to  the other a measured amount of chemical drops
 off the  plate into the  solution, tank.   The rake bar  above  each end of the
 plate helps  to regulate the repeatability  of  the feed rate.

 Grooved  Disc  Feeder

     This  feeder  consists  of  a  grooved horizontal  disc which meters the
 chemical addition.   The disc  rotates and the  grooves are  filled as they pass
under the  storage hopper,  are  struck off level, and  then a stationary plow
removes  the material from  the  groove for metering.  The feed rate is varied
by  changing  the  speed of disc rotation or by changing the groove size.   Typically,
 these feeders are used  for applications requiring  small feed rates of dry materials.
                                     58

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        PRESSURE
          PLATE
          ROTOR
         SCRAPER
                                            VARIABLE SPEED
                                            TRANSMISSION
                                    MOTOR
                                  INSPECTION AND
                                  SAMPLING. CHUTE
Figure 6.  Positive displacement rotary feeder.
                      59

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                                    OSCILLATING HOPPER
                                       SCRAPER
Figure 7.   Oscillating hopper or universal volumetric feeder.
                           60

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Vibrating Feeder

     The vibrating feeder is another volumetric feeder.  With this feeder,
motion is obtained by means of an electromagnet anchored to the feeding
trough, which in turn is mounted on flexible leaf springs.  The magnet,    x
energized by pulsating current, pulls the trough sharply down and back -
then the leaf- springs return it up and forward to its original position.
This action is repeated 3600 times per minute (when operating on 60-cycle,
a.c.), producing a smooth, steady flow of material.

Volumetric Belt Feeder

     The volumetric belt feeder uses a continuous belt of specific width
moving from under the hopper to the dissolving tank.  The material falls on
the feed belt from the hopper and passes beneath a vertical gate.  For a
given belt speed, the position of the gate determines the volume of material
passing through the feeder.  An example of a volumetric belt-type feeder is
shown in Figure 8.                             .,

Screw-Type Feeder       .

     The volumetric screw-type  feeder employs a screw  or  helix  at the
bottom of  the hopper  to  transfer dry chemical to  the solution chamber.
A typical  screw-type  volumetric feeder  is'shown in Figure 9.

     The basic  drawback  of the volumetric  feeder  is that  it  cannot  compensate
 for changes  in  the  density of  materials and  is therefore  not as accurate
 as two  other types  of dry feeders:   the gravimetric and  loss-in-weight
 feeders.   For these feeders,  the volumetric  design is  modified  to  include
 a gravimetric or  loss-in-weight controller,  which allows  for weighing of
 the material as it  is fed. "Both  gravimetric and  volumetric  feeders can be
 used to feed in proportion to  the  flow of  wastewater.

 Belt-Type Gravimetric Feeder

      Belt-type gravimetric feeders have a wide capacity range and usually can
 be sized for any use in a wastewater treatment plant.   Belt-type gravimetric
 feeders use a basic belt feeder with a weighing and control system.  Feed
 rates can be changed by adjusting the weight per foot of belt,  the belt
 speed, or both.  There are two types of gravimetric belt-type feeders, the
 pivoted belt type and the rigid belt type.

      The pivoted belt feeder consists of a feed hopper, an endless traveling
 belt mounted on a pivoted frame,  an .adjustable weight which counterbalances
 the load on the belt, and a means of continuously and automatically adjusting
 the feed of material to the belt.  Dry chemical flow to the feeder can be
 controlled by a gate placed between the feed hopper and the belt (as shown
 in Figure 10) or by controlling the amplitude of vibration in a vibrating
 deck placed between  the feed hopper and the belt.
                                      61

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     FEED SECTION
                                     GATE
STATIONARY DECK
          J
                                                       FEED BELT
         Figure 8.  Volumetric belt  type  feeder
                           62

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               MOTOR
         GEAR REDUCER
FEED RATE  REGISTER AND
   FEED ADJUSTING KNOB
      SOLUTION CHAMBER
                                                                      HOPPER
ROTATING AND
RECIPROCATING
FEED SCREW
                                                                      JET MIXER
  Figure 9.   Typical  helix or screw-type volumetric feeder  (courtesy of
              Wallace  & Tiernan,  division of Pennwalt Corporation).
                                        63

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                    HOPPER
COUNTERWEIGHT
           FULCRUM
                                GATE
ENDLESS BELT

      Figure 10,  Pivoted belt gravimetric  feeder.
                        64

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     The rigid belt feeder is similar to the pivoted belt feeder except for
one main difference.  With the pivoted belt filter, adjustment is accomplished
through action of the belt tilting up and down, while with the rigid belt,
adiusting occurs through action of the scale beam dependent only on the
weight of the belt.  An example of a rigid belt gravimetric feeder is given
in Figure 11 •

     Good housekeeping and the need for accurate feed rates dictate that the
gravimetric feeder be shut down and thoroughly cleaned on a regular basis.
Chemical build-up can affect accuracy and can even jam the equipment in
some cases.

Loss-In-Weight Feeder

     The loss-in-weight feeder should be used where  the  greatest-accuracy  or
more economical use of chemical is important.  This  feeder only works  for  feed
rates up to a rate  of 4,000  Ib/hour.  The loss-in-weight feeder lias a
material hopper and feeder set on enclosed  scales.   The  feed  rate  controller
is used to deliver  the dry chemical at  the  desired rate.

Dissolvers

     Dissolvers are also  important to  dry  feed systems since  any metered
chemical must be wetted and  mixed with water to  provide  a chemical solution
free of lumps and  undissolved particles.  Most feeders,  regardless of  type,
discharge  their material  to  a small  dissolving tank which is  equipped  with
a nozzle  system and/or mechanical  agitator depending on  the  solubility of
 the  chemical  being fed.   It  is important that the surface of  each  particle
become completely  wetted  before entering the feed tank to ensure accurate
 dispersal and to avoid  clumping,  settling or floating.

      A dissolver for a  dry chemical feeder is unlike a chemical feeder, which
 by simple adjustment and change of speed can vary its output tenfold.   The
 dissolver must be designed for the job to be done.,  A dissolver suitable
 for a rate of 10 Ib/hour may :not be suitable for dissolving at a rate of
 100 Ib/hour.

      The  capacity of a dissolver is based on detention time, which is directly
 related to the wettability or rate of solution of the chemical.  Therefore,
 the dissolver must be large enough to provide the necessary detention for
 both the  chemical and the water at the maximum rate of  feed.

 SOLUTION  FEEDERS

      A typical solution  feed system (Figure 12) consists of a storage  tank,
 transfer  pump, day tank  (for dilution), and liquid  feeder.   Some  liquid
 chemicals can be  fed directly without  dilution and  the  day tank would not
 be needed.   Dilution water  is usually  still added to the solution feed pump
 discharge line after the chemical is metered  to prevent plugging,  reduce
 delivery  time, and to help  mix the chemical with  the water being  treated.
                                      65

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             SCALE BEAM    HOPPER
   CONTROL WEDGE
           ^—•
            O
VIBRATOR' *
       VARISPEED TRANSMISSION    ENDLESS BELT
      Figure 11.  Rigid belt gravimetric feeder.
                        66

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                              TRUCK FILL LINE
DILUTION
 WATER
                       SOLUTION
                     STORAGE TANK
                                           •VENT, OVERFLOW
                                           AND DRAIN
      DILUTION WATER
                                  TRANSFER
                                  PUMP
 VENT,  OVERFLOW
 AND DRAIN

•MIXER
                                      SAMPLE TAP
                                     SOLUTION
                                      FEEDER
                       POINT OF
                      APPLICATION

       Figure 12.  Typical solution feed system.
                         67

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     Liquid feed systems are generally recommended for use:

        •  When low chemical quantities are required.

        •  With less stable chemicals.

        •  With chemicals which are fed more  easily as a liquid,

        •  Where handling of dusty chemicals or dangerous chemicals
            is undesirable.

        •  With materials only available as liquids.

Liquid  feeders usually are metering pumps or orifices.  These metering pumps
usually are of the positive displacement variety, plunger or diaphragm type.
Examples of plunger and diaphragm pumps are given in Figure 13.  Positive
displacement pumps can be set to feed over a wide range by adjusting the pump
stroke  length.  In some cases, control valves and rotameters may be all that
is needed, while in other cases the rotating dipper type feeder may be
satisfactory.  For uses like lime slurry feeding, however, centrifugal pumps
with open impellers are used.  The type of liquid feeder used depends on the
viscosity, corrosivity, solubility, suction and discharge heads, and internal
pressure relief requirements.

GAS FEEDERS

     Gas feeders can be classifed as solution feed or direct feed.  Solution
feed vacuum type feeders are most commonly used in chlorination and in
dechlorination with sulfur dioxide.  In chlorination, chlorine gas is
metered under vacuum and is mixed with water or plant effluent in an injector
to produce a chlorine solution.  The flow of chlorine gas is automatically
shut off on loss of vacuum, stoppage of the solution discharge line, or
loss of operating water pressure.

     Direct feed or "dry feed" equipment is infrequently used, only when
either water or electricity or both is unavailable at a site.  This type of
equipment is nearly the same as the solution feed type except that there is
no device for making and injecting an aqueous solution.   The gas itself is
piped directly into the water to be treated.

     More information about the uses and limitations of the general type of
chemical feeders is given in Table 23.

FEED SYSTEM REQUIREMENTS FOR SPECIFIC CHEMICALS

Alum

     To prepare dry alum for feeding, dissolving tanks should be made of a
non-corrosive material.  Dissolvers should be the right size to get the
desired solution strength.  Most solution strengths are 0.5 Ib of alum to
1 gallon of water, or a 6% solution.  The dissolving tank should be designed
                                     68

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                                 SUCTION VALVE
          DIAPHRAGM PUMP
Figure 13.  Positive  displacement pumps.
                   69

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                                             TABLE 23




                                 Types of  Chemical  Feeders
                                                                            Limitations
Type of Feeder
Dry feeder:
Volumetric:
Oscillating throat (universal)

Rotating cylinder (star) ....


Belt 	
Gravimetric:
Continuous— belt and scale
Loss in weight 	
Solution feeder:
Nonpositive displacement:
Decanter (lowering pipe) . . .
Orifice 	
Rotameter (calibrated valve)
Loss in weight (tank with
control valve).
Positive displacement:
Rotating dipper 	
Proportioning pump:

Piston 	
Gas feeders:
Solution feed 	



Direct feed 	


Use

Any material, granules or
powder.
Any material, any particle
size.
Most materials including NaF,
granules or powder.
Any material, granules or
powder.
Dry, free flowing material,
powder 'or granular.
Dry, free flowing material,
powder, granular, or lumps.
Dry free flowing material up
to 1%-inch size, powder or
granular.
Dry, free flowing, granular
material, or flood able
material.
Most materials, powder,
granular or lumps.
Most solutions or light slurries
Most solutions .
Gear solutions 	
Most solutions '. 	
Most solutions or slurries ....
Most solutions. Special unit
for 5% slurries.1 	
Most solutions, light slurries

Chlorine 	

Sulfur dioxide 	
Carbon dioxide 	 ป 	
Chlorine ...
Ammonia 	
Carbon dioxide 	
General



Use disc un-
loader for
arching.



Use hopper
agitator to
maintain
. constant
density.






.










Capacity
cu ft/hr
001 to 35
0.02 to 100 .; . . .
001 to 1 0
8 to 2 000
or
7.2 to 300
0 OS to 18
0002 toO 16
0 1 to 3 000
0.02 to 2 	
0 02 to 80

0.01 to 10 ... .
016 to 5
0005 toO 16
or
0.01 to 20
0 002 to 0 20
0 1 to 30
0 004 to 0 1 5

001 to 170

' 8000 Ib/day max
2000 Ib/day max
7600 Ib/day max
6000 Ib/day max

1 20 Ib/day max
1 0.000 Ib/dav max
Range

40 to 1
40 to 1
20 to 1
10 to 1
or
100 to 1
20 to 1
10 to 1
10 to 1
or
100 to 1
100 to 1
100 to 1

100 to 1
10 to 1
10 to 1
30 to 1
100 to 1
10 to 1

10 to 1

20 to
20 to
20 to
20 to
10 to
7 to
20 to
1 Use special heads and valves for slurries.
                                               70

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for a minimum detention time of 5 minutes at the maximum feed rate.
Dissolvers should have water meters and mixers so that the water/alum
mixture can be. controlled.  Most liquid alum is fed as it is delivered,
in a standard 50 percent solution.

     Alum is usually fed by positive displacement metering pumps.  Dilution
water usually is added to an alum feed pump discharge line to prevent line
plugging, to reduce delivery time to the point of application, and to.help
mix the alum with the water being treated.  The output of the pumps can be
controlled automatically in proportion to plant flow.  This is done by
setting the alum dosage for the maximum flow rate.  The controls are then
set to automatically Adjust the off-on cycle and the amount of alum pumped
to the actual flow.

Carbon Dioxide

     Feeding systems for  the stack gas source of carbon dioxide  consist of
simple valving arrangements, for  admitting varying quantities of make-up air
to the suction side of the  constant volume compressors, or-for venting excess
gas on the compressor discharge.

     Pressure generators  and submerged burners  are regulated by  valving
arrangements on  the fuel  and air  supply.  Generation of carbon dioxide by
combustion is usually difficult  to control, requires frequent operator
attention and demands considerable maintenance  over  the life  of  the  equipment,
when  compared to liquid C02 systems.

    ^Commercial  liquid carbon  dioxide is more generally used because  of its
high purity, the  simplicity and range of  feeding equipment, ease of control,
and smaller, less expensive piping systems.  After vaporization, carbon
dioxide with suitable metering and pressure reduction may be  fed directly
to the point of  application as a  gas.  Metering of directly fed  pressurized
gas is difficult  due to the high  adiabatic expansion characteristics  of the gas.
Also, direct feed requires  extremely fine bubbles  to insure that the  gas goes
into  solution;  this, in turn,  can lead  to scaling  problems.   Because  of this,
vacuum operated,  solution type gas feeders  are  preferred.   Such  feeders
generally include safety  devices  and operating  controls  in a  compact  panel
housing,  with materials of construction suitable  for carbon dioxide  service.
Absorption of .carbon dioxide in the  injector  water supply approaches 100%
when  a ratio of 1.0 Ib  of gas  to 60  gallons of  water is maintained.

Chlorine

      Elemental  chlorine is a poisonous yellow-green gas  at ordinary  temperature
and  pressure.   The/gas  is stored as  a  moisture-free liquid under pressure in
 specially constructed steel containers from which it is  vaporized either
 directly or  with heated vaporizers.   Chlorine gas feeders may be classified
 into two types, direct  feed or solution feed.

      Direct;feed or dry feed gas feeders deliver chlorine gas under  pressure
 directly to the point of application.   Direct feed gas chlorinators  are less
                                      71

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safe than solution feed chlorinators and are used when there is no adequate
water supply available for ejector operation.  In solution feed vacuum type
feeders, chlorine gas is maintained under a vacuum throughout the apparatus.
Vacuum is created by water flow through an injector to move the chlorine
from the supply system through the chlorine gas metering devices to the
injector.  Chlorine gas is mixed with water in the injector and the chlorine
solution is moved to the point of application.  In this feeder, the vacuum
controls the operation of the chlorine inlet valve such that the chlorine
will not feed unless sufficient vacuum is induced through the apparatus.
This type of feeder is most common because safe operation is assured.  It
employs a direct indicating meter, and the flow of chlorine is automatically
shut off on•loss of vacuum, stoppage of discharge line, or loss of operating
water pressure.

     In some cases it may be necessary to provide more than one point of
injection from a single injector, and this requires manifolding.  Valves
for manifolding generally are either the ball type or diaphragm type.

     There are two basic types of chlorine diffusers:  one for discharging
chlorine solution into a pipe flowing full; and the other for discharging
into an open channel or open body of water.

     A full discussion of chlorination is beyond the scope of this manual.
More information concerning chlorination systems is available in
References 3, 9 and 10.

Chlorine Dioxide

     Chlorine dioxide  is an intense greenish-yellow gas that  is quite
unstable, and, under certain conditions, is  explosive.  It cannot be shipped
in containers as is chlorine gas because of  its explosive nature, and  it must
be generated at the point of use and applied immediately.

     Although readily  soluble in water, it does not react with water as does
chlorine.  Chlorine dioxide is easily expelled from solution  in water  by
blowing  a small amount of air through the solution.  Aqueous  solutions  of
C1C-2 are also subject  to some photodecomposition.

     Chlorine dioxide  is generated by oxidizing sodium chlorite with chlorine
 (either  chlorine gas or hypochlorite) at a pH of 4 or  less.   This means
that the injector system of the chlorination assembly  must be such  that the
chlorine solution strength is never less than about 500 mg/1.  Since the upper
limit of this solution strength should not exceed 3,500 mg/1  to prevent
break-out of molecular chlorine at the point of application,  the effective
range of chlorine dioxide production is about 7:1.  Chemical  feed devices can
handle ranges up to 20:1 on a flow proportional basis  and 200:1 on  a compound
loop control system.
                                     72

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Ferric Chloride

     Since ferric chloride is always fed as a liquid, it is normally obtained
in liquid form containing 20 to 45 percent FeCl3.  When iron salts such as
ferric chloride are used for wastewater coagulation in soft waters, a small
amount of base (such as sodium hydroxide or lime) is needed to neutralize the
acidity of these strong acid salts.
                                 ft                    '
     Because of hydrolysis, it may not be a good idea to dilute ferric
chloride solution from its shipping concentration to a weaker feed solution.
Ferric chloride solutions may be transferred from underground storage to day
tanks with rubber-lined self-priming centrifugal pumps having teflon rotary
and stationary seals.  Because liquid ferric chloride can stain or deposit,
glass-tube rotameters are not used for metering.  Instead, rotodip feeders
and diaphragm metering pumps made of rubber-lined steel and plastic often
are used for feeding ferric chloride.

Ferric Sulfate

     Feed solutions are usually made up at a water~to^chemical ratio of 2:1
to 8:1 (on a weight basis) with the usual ratio being 4:1 with a 20-minute
detention time.  Care must be taken not to dilute ferric sulfate solutions
'to less than 1 percent in order to prevent hydrolysis and deposition.of ferric
hydroxide.                                                        •

     Dry feeding requirements are similar to those for dry alum except that
belt type feeders are rarely used because of their open type of construction.
Closed construction, as found in the volumetric and loss-in-weight type
feeders, generally exposes a minimum of operating components to the vapor,
and thereby minimizes maintenance.  A water jet vapor remover should be
provided at the dissolver to protect both the machinery and operator.

Ferrous Sulfate                                          •

     The granular form of ferrous sulfate has the best feeding characteristics
and gravimetric or volumetric feeding equipment may be used.  The optimum
chemical-to-^water ratio for continuous dissolving is 0.5 Ib/gallon or 6"percent
with a detention time of 5 minutes  in the dissolvers.  Mechanical agitation
should be provided in the dissolver to assure complete solution.
                                       1            '                      •
Lime                                                                    •

     Although  lime comes in many  forms, quicklime and hydrated lime are used
most often  for wastewater  coagulation.  Quicklime is almost all calcium oxide
 (70  to 96 percent CaO).  High-calcium quicklime  contains more than 88 percent
CaO  and less than 5  percent magnesium oxide  (MgO) and is  generally preferred,
for wastewater treatment.  Dolomitic lime may contain up  to 40 percent MgO,
which is not desirable for wastewater coagulation and which adversely affects
sludge thickening and dewatering.
                                      73

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     Quicklime (unslaked lime) is almost all CaO and first must be converted
to the hydrated form (Ca(OH)2)ซ  Hydrated or slaked lime is a powder obtained
by adding enough water to quicklime to satisfy its affinity for water.
Hydrated lime needs only enough water to form milk of lime.  Wetting or
dissolving tanks usually are designed for 5 minutes detention with 0.5 lb/
gallon of water or 6 percent slurry at the highest feed rate.  Hydrated lime
often is useTd where maximum feed rates are less than 250 Ib/hour.

     Dilution is not too important in lime fee'ding; therefore, it is not
necessary to control the amount of water used in feeding.  Hydraulic jets
may be used for mixing in the wetting chamber of the feeder, but the jets
should be the right size for the water supply pressure.

     Lime is never fed as a solution because of its low solubility in water.
Also, quicklime and hydrated lime usually are not applied dry directly to
the wastewater for the following reasons:

      •  they are transported more easily as a slurry;

      •  a lime slurry mixes better'with the wastewater than dry lime;

      •  pre-wetting the lime in the feeder with rapid mixing helps to make
         sure that all particles are wet and that none settles out in the
         treatment basin.

     Major components of a lime feed system  (illustrated in Figure 14) include
a storage bin, dry lime feeder, lime slaker, slurry holding tank, and lime
slurry feeder.  The slurry holding  tank is usually needed only when the point
of application is at a remote location.  Quicklime feeders usually must be  the
belt or loss-in-weight gravimetric  types because bulk density changes so much.
Feed equipment usually has an adjustable feed range of at least  20:1  to
match the operating range of the slaker.  The main parts of a lime slaker for
wastewater treatment usually include one or more slaking bins, a dilution
bin, a grit separation bin, and a continuous grit remover.

     There are two basic types of lime slakers, the  "paste"  or  "pug mill"
type slaker and the "detention" type slaker.  The paste-type slaker (Figure 15)
admits water as required to maintain a desired mixing viscosity.  The viscosity
therefore sets the operating retention time  of the slaker.  The  detention-type
slaker (Figure 16) admits water to  maintain  a desired ratio with the  lime,  and
therefore the retention  time  is set by the lime feed rate.  The  detention
slaker produces a lime slurry of about 10 percent  Ca(OH)2 while  the paste
type produces a paste of about 36 percent.   Other  differences between the
two slakers are that the detention  type slaker operates with a higher water
to lime ratio, a lower temperature, and a longer retention time.  For either
slaker type, vapor removers are required for feeder protection,  since lime
slaking produces heat in hydrating  the CaO to Ca(OH)2-
                                      74

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           LIME
         STORAGE
           BIN
           GATE
                          FLOW RECORDER
                           WITH PACING
                           TRANSMITTER
                              pH RECORDER
                               CONTROLLER
        FLEXIBLE
       \CONNECTOfy
        QUICKLIME
          FEEDER
                    _
                    U
                        1
       LIMESLAKER
  L
       Solenoid valve —^j ' \

Slaking water.—.         '—r^
      Rotameters
• Dilution water

 I       Dosage      I
 |       adjuster -p   L.

J
                                   Mixer
           Variable speed*
               meter —
        Level
        control?
                                                                 LIME
                                                                SLURRY
                                                                FEEDER
                                                                   pump
                              I  ^s- Flow-transmitter
                            X
                                                       DH Sensor
                                                                           Jl
                             i
                              Prlmary
                              Device
                                                                              Treated
                                                                              waste
Figure  14.  Illustrative  lime feed system for wastewater coagulation.
                                       75

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SLAKING
WATER
                                             TORQUE CONTROLLED
                                               WATER -VALVE
        DUST SHIELD

WATER SPRAY
       SLAKING COMPARTMENT
                     SLURRY DISCHARGE
                         SECTION
                                                                 GRIT DISCHARGE

                                                                 LIQUID LEVEL
                                   WATER FOR GRIT
                                      WASHING

                                GRIT ELEVATOR
                              CLASSIFIER

              Figure  15.    Typical  paste-type  slaker.
                                      76

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QUICKLIME
                    MIXER
                                                             GRIT DISCHARGE
                                                                     MILK
                                                                     OF LIME
                                                                     OUTLET
                                                        GRIT WASH JETS
                                                    GRIT CONVEYER
             Figure 16.   Typical  detention-type slake.r.
                                     77

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     The required slaking time varies with the source of lime.  Fast slaking
limes will complete the reaction in 3 to 5 minutes, but poor quality limes
may require up to 60 minutes and an external source of heat, such as hot
water or steam.  Before selecting a slaker, it is advisable to determine
the slaking time, best initial water temperature, and optimum water:lime
ratio for the lime to be used, according to procedures for slaking tests
recommended by the American Water Works Association.  More information about
lime storage, handling, and use can be found in Reference 8.


Methanol

     Methanol is a colorless liquid, and non-corrosive (except to aluminum
and lead) at normal atmospheric temperature.  Transfer pumps should always
have positive suction pressure and should be protected by a strainer.
There are three basic pumping arrangements which can be.used:  (1) diaphragm
chemical feed pumps using an adjustable stroke for volume control;
(2) positive displacement pumps with variable speed drives controlled by
either a flow meter or by counting Yevolutions; (3) centrifugal or regenera-
tive turbine pumps with variable speed drives controlled by a flow meter.

Ozone

     Ozone is produced commercially by the reaction of an oxygen-containing
feed gas in an electrical discharge.  The feed gas, which may be air, pure
oxygen, or oxygen enriched air, is passed between electrodes separated by
an insulating material.  A high voltage of up to 20,000 V is applied to
the high tension electrode.  The ozone molecule, made up of three oxygen
atoms, is highly unstable, and is one of the most powerful oxidizing
agents known.

     Ozone is a pale blue gas having a distinct pungent odor.  In concentra-
tions usually employed, the odor is detectable but the color is not visible.
It is both toxic and corrosive.  Because of its unstable nature, it must be
generated at the point of use.  Consequently, safety aspects of transporta-
tion and storage are eliminated.

     There are three basic ways to generate and use ozone in wastewater
treatment:  (1) generation from air, (2) generation from oxygen and recycle
oxygen to the ozone generation system, and (3) generation from oxygen used
for oxygen activated sludge system and recycle oxygen to the activated
sludge system.  Figure 17 shows these different methods.

     The once-through air approach uses conventional air drying techniques
such as compression and refrigeration, followed by desiccant drying.  Ozone
generated from air is usually 0.5 to 2.0 percent by weight, but is usually
produced at 1.0 weight percent.  Ozone is typically mixed with wastewater
in a contact basin as shown in Figure 18.  Fine bubble diffusers are used
to feed the ozone into the basin.  Packed beds have also been used as
contactors.  Following treatment in the covered ozone contactor, the gas
is decomposed to prevent high concentrations of ozone from being released
to the atmosphere.

                                     78

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                       ONCE-THROUGH  AIR PROCESS
  AIR
                  CHILLED
                   WATER
                                                          CLEAN AIR
                                                          DISCHARGE
                                                               WASTEWATER
   COMPRESSOR
                         WATER














^














CONTACTOR


1







                                                            1
                                                                       OZONE
                                                                       DECOMP '
                                                                       DEVICE
                              DRYER
                                                                TREATED
                                                                WATER
                       OXYGEN RECYCLE PROCESS
*ซ•••*••••••ป•*•*
                       ONCE-THROUGH OXYGEN PROCESS
r
i
i
L.
                            COMPRESSOR
                               OZONE
                               GENERATOR
                                 OZONE DECOMPOSITION
                                    DEVICE

    WATER
    HAIhR
          SLUOIit
          REACTOR
                                                                      EFFLUENT
                                                                      WASTE
                                                                |      WATER
                                                                1
                                                              OZONE
                                                              CONTACTOR
                                                       !_ET~j'
L
                Figure 17.  Alternative ozonation systems.
                                     79

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                                       To ozone
                                       destruct
   Influent
      6
Upward velocity
  ฃ 0.5 fps
X X
                    Entrance
                     baffle
                     TTTTT
                                        /
              TTTTTTTTTT
                                                         t
ILL
                                      /
                                     r
                  Downward
                  velocity
                   < 0.5 fps
                                                          Exit baffle
 Figure 18.   Typical ozone contact  basin using porous  diffusers,
                                  80

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     The oxygen recycle approach may be used to recover valuable oxygen-rich
off-gas from the contactor when very pure oxygen is fed to the ozone
generator.  High-purity oxygen gas sometimes is used since it enables the
generator to produce two to three times as much ozone per unit time, and uses
only about half as much generator power per pound compared to ozone produced
from air.

     Once-through oxygen is the simplest method of ozone wastewater disin-
fection.  Dry oxygen is produced on-site by a cryogenic air separation process
or by pressure-swing adsorption and then fed to the ozone generator.
Wastewater is next treated by ozonation in the contactor and, after
4estruction of the unreacted ozone, the off-gas is used elsewhere in the
plant.  It may, for example, be used in a biological reactor or fed into
incinerators for sludge disposal.

     There are three basic types of commercially available ozone generators:
the Otto plate, the tube and the Lowther plate.  More information about the
types of ozone generators available can be found in References 1 and 11.

Polymers

     When dry polymers are used, the polymer and water must be'blended and
mixed to obtain the desired solution.  Initially, complete wetting of the
polymer is necessary using a funnel-type aspirator.  After wetting, warm
water must be added and gently mixed for about 1 hour.  Polymer feed solution
strengths are usually in the range of 0.1 to 0.75 percent.  Stronger solutions
.are often too viscous to feed.  Metered solution is usually diluted just prior
to injection to the process to obtain better dispersion at the point of
application.

     The solution preparation system can include either a manual or an
automatic blending system with the polymer dispensed by hand or by a dry
feeder to a wetting jet and then to a mixing-aging tank at a controlled
rate.  The aged polymer solution is transported to a holding tank where
metering pumps or rotodip feeders feed the polymer to the process.  A
schematic of a manual dry polymer feed system is shown in .Figure 19.

     The solution preparation system may be an automatic batching system,
as shown in Figure 20, that fills the holding tank with aged polymer as
required by level probes.  Such a system is usually provided only at large
plants.

     Polymer solutions above 1 percent in strength should normally not be
used because they are very viscous and difficult to handle.  Most powdered
polymers are very stable when dry, but even in cool, dry conditions, they
should not be stored as powders in unopened  bags for more than 1 year.
Once polymers are dissolved, they may become, unstable within 2 or 3 days.

     Liquid polymers need no aging and simple dilution is the only requirement
for feeding.  The dosage of.liquid polymers may be accurately controlled
by metering pumps or rotodip feeders.

                                      81

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WATER SUPPLY-
                       r-N-
                              POINT OF
                             APPLICATION
 FEEDER


DISPERSER



MIXER
                                            DISSOLVING-AGING
                                                 TANK
                                           -HOLDING TANK
                                          -SOLUTION FEEDER
      Figure 19.  Manual dry polymer  feed system.
                            82

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        tor.
       WATER
             SOLENOID   ,SCALE
             / VACVE    /
DISPERSER
 BLENDER
KOTE:  CONTROL t  INSTRUMENTATION

      WIRING IS  NOT SHOWt
  POINT OF APPLICATION
*
SOLUTI ON
FEEDERS.^^^
ION *f \ \

1

i T
1

HOLDING TANK
K-



                                                     TRANSFER PUMP
                                                          LEVEL PROBE
             Figure  20.   Automatic dry polymer  feed  system.
                                         83

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     Because polymers can cause very slippery conditions in a treatment
plant, spills should be cleaned up immediately.  Other safety precautions
as specified by the manufacturer should also be observed.


 Powdered Carbon

      When powdered activated carbon is  used,  it  is mixed directly with the
 wastewater,  fed as slurry,  and removed  by coagulation and settling.   The
 carbon slurry is transported by pumping the mixture  at a high velocity to
 keep the particles from settling and collecting  along the bottom of  the pipe.
 The velocity of the slurry  should be kept between 3  and 5 ft/second.   At
 velocities less than 3 ft/second, carbon will settle out in the pipeline;
 and at velocities greater than 10 ft/second,  excessive carbon abrasion and
 pipe erosion will occur. At most plants, carbon slurries are fed at a
 concentration around 10.7 percent or 1  Ib carbon/gallon water;  typically,
 at this concentration, either centrifugal pumps  or a combination of
 centrifugal pumps and eductors are used to transport the carbon slurry.
 Diaphragm slurry pumps or double-acting positive displacement pumps  are
 used for transporting higher concentrations.   Another transport method
 used is a pressure pot system in which  carbon is loaded into a  pressure
 tank and forced out by pressurizing the vessel.   The carbon slurry may be
 fed using a rotodip feeder.

      Activated carbon is a  dusty respiratory irritant which smolders if
 ignited.  Activated carbon  should be isolated from flammable materials
 such as rags, chlorine compounds and all oxidizing agents.

 Soda Ash

     Dense soda ash  is generally used in municipal applications because of
 superior handling  characteristics.   It has  little dust, good flow character-
 istics, and will not arch in  the bin or flood the feeder.  It is relatively
 hard to dissolve and ample  dissolver capacity must be provided.   Normal
 practice calls for Qฃ5, Ib of  dense soda ash per gallon of water or a 6 percent
 solution retained  fot^ZO minutes in  the dissolver.  Dissolving of soda ash
 may be hastened by the use  of warm dissolving water.   Mechanical or hydraulic
 jet mixing should be provided  in the dissolver.

 Sodium Aluminate

     Dry sodium aluminate is not available  in bulk quantities; therefore,
 small day-type hoppers with manual filling  arrangements are used.  Dissolvers
 for the free-flowing grade  of  sodium aluminate are normally sized for 0.5
 Ib per gallon or 6 percent  solution  strength with a dissolver detention time
 of 5 minutes at the maximum feed rate.  After dissolving, agitation should
 be minimized or eliminated  to  prevent deterioration of the solution.  Solution
 tanks should be covered  to  prevent carbonation of the solution.

     Liquid sodium aluminate may be  fed at  shipping strength or diluted
 to a stable 5 to 10 percent solution.  Stable solutions are prepared by
 direct addition of low-hardness water and mild agitation.  Air agitation is
 not recommended.

                                     84

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Sodium Chlorite

     Sodium chlorite (NaCl02) for the generation of chlorine dioxide is
available as an orange powder or as a solution.

     The sodium chlorite pump is sized so as not.to exceed a solution strength
of 20 percent by weight (0.20 kg/i (1.66 lb/gal)).  Diaphragm pumps rather.
than piston pumps normally are used for"handling .the .solutions.  .The solution
container for sodium chlorite is sized for at least one day's operation.
     Sodium chฃorij-e"will withstand considerable rough handling  if  it  is  free
from qrganic matter.  However, in contactwith organic materials (clothing,
sawdust, brooms), it may ignite.  It is sensitive  to heat,  friction, and
impact.. These problems' are minimized with  sodium  chlorite  solutions.
             *                "                             '              " ,
Sodium Hydroxide              ,  .,      " v  .  ..     .........               ,

     Liquid sodium hydroxide, or caustic;soda, is  usually delivered in bulk
shipments and must then be transferred to., storage.  The  caustic  soda is often'
heated and fed by metering pumps as a concentrated solution.   Dilution water
is usually added after feeding to the pump  discharge line.   Feeding systems
for caustic soda are about the same as for  liquid  alum except for materials
of construction. ..._....,             ,                      ...._..,,

     Caustic soda is poisonous and dangerous  if handled  improperly.  To
avoid accidental spills, all pumps, valves  and lines should be checked
regularly for leaks.  Operators should be properly Instructed in the
precautions related to the safe handling of this chemical.
 STORAGE  '.  .    ..  .       :      .  "          .. .  '"...       ,     '  ;'",";" '.  '". ."_'

      The equipment used for storing and handling chemicals  varies with
 the type of chemical used,  liquid or dry form of the chemical, quantity of
 chemical, used,  and planl: size.   Storage requirements vary,'but typically
 may be 15 to 30 days of use or  150 percent of the bulk transport capacity,
 whichever is greater.

      It is  also important to recognize that there may be special precautions
 necessary for the  safe  unloading  and storage  of  certain chemicals.   Because
 it  is not practical to  provide  a  complete discussion of these  precautions
 in  this manual,  it. is recommended that the operator obtain  such.information
 directly from the  chemical  manufacturer before implementing a.chemical
 storage and handling system.


 Unloading

      Chemicals  can be delivered to a wastewater treatment plant in dry,
 liquid or gaseous form.  Dry chemicals are generally available  in either
 bagged or bulk form.  Where daily requirements are small; bagged'chemicals
                                      85

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are preferred and the handling and storage operations are relatively simple,
usually involving either manual labor or mechanical aids.  Bagged chemicals
are delivered in loose bags or palletized in trucks or box cars and are
generally transferred by hand truck or fork lift to storage.  Unloading
conveyors may be preferred for loose bags, especially if there is a long
distance between the unloading point and storage area.  Palletized bag ship-
ments, with fork lift trucks moving the loaded pallets to storage and then to
the point of use, eliminate much manual labor.

     Bulk quantities of dry or liquid chemicals are delivered in trucks or
by rail in box cars -.and hopper cars.  Bulk unloading facilities usually must
be provided at the treatment plant.  Rail cars are constructed for top
unloading and therefore require an air supply system and flexible connectors
to pneumatically displace the chemical from the car.  The United States
Department of Transportation regulations concerning chemical tank car
unloading should be observed.  A typical pneumatic conveying system for dry
chemicals is shown in Figure 21.  Unloading of liquid chemicals from a tank
truck is usually accomplished by gravity or by a truck-mounted pump.

     Chlorine (as well as ammonia and sulfur dioxide), classified by the
U.S. Department of Transportation and the U.S. Coast Guard as a nonflammable
compressed gas, must be packaged in containers that comply with DOT and/or
Coast Guard regulations regarding loading, handling, and labeling when
shipped in the United States by rail, water or highway.  Chlorine gas is
commonly available in 100 Ib and 150 Ib steel cylinders, in ton containers,
and also in large quantities in tank cars (rail), tank trucks, and barges.

     Various mechanical devices, such as  skids, troughs, and up-ending
cradles  facilitate handling of chlorine  cylinders.  When unloading from
trucks or platforms, cylinders must not be dropped  to ground level.  If
cylinders must be lifted and an elevator  is not available,  specially
designed cradles or carrying platforms in combination with  a crane or
derrick are recommended; chains, lifting  magnets, and rope  slings that
encircle the cylinders are unsafe and should not be used.   For lateral
movements a properly balanced handtruck is useful.  Cylinders being moved
should always have valve protection hoods in place; these hoods are not
designed to hold the weight of cylinders  and their  contents, and cylinders
should never be lifted by this means.

     Ton containers may be moved by various methods, such as by specially
fitted trucks and dollies, a monorail system, or rolling.   Where it is
necessary to lift them, as from a TMU car or truck, a suitable lift clamp
in combination with a hoist or crane of at least 2-ton capacity should be
used.  Valve protection hoods should always be in place when ton containers
are being moved.

     Receiving and unloading areas and safety precautions applicable to
handling single-unit railroad tank cars,  tank trucks, and other shipping
containers are subject to strict regulations.
                                     86

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87

-------
Bulk Storage

     A typical bulk storage tank or bin for dry chemicals is shown in
Figure 22.  Dust collectors should be provided on manually and pneumatically
filled bins.  The material of construction and. the required slope on the bin
outlet vary with the type of chemical stored; in addition, some dry chemicals
such as lime  must be stored in air-tight bins to keep moisture out.

     Bulk storage bins should have a discharge bin gate so feeding equipment
can be isolated for servicing.  The bin gate should be followed by a flexible
connection and a transition chute or hopper which acts as a conditioning
chamber over the feeder (shown previously in Figure 5).

     Liquid storage tanks should be sized according to maximum feed rate,
shipping time required, and quantity of shipment.  The total storage
capacity should be 1^ times the largest anticipated shipment, and should
provide at least a 10-day to 2-week supply of the chemical at the design
average dose.  Storage tanks for most liquid chemicals may be located
inside or outside; however, outdoor tanks must usually be insulated and/or
heated to prevent crystallization.  Storage tanks for 'some liquids, such as
liquid caustic soda, should be provided with an air vent for gravity flow.

     Liquid storage tanks can be located either at ground level or above
ground level, depending upon whether gravity feed or pressure feed is
desired at the point of application.  Figures 23 and 24 show two common
liquid feed systems, one with overhead storage and one with ground storage.
The rotodip-type feeder or rotameter often is used for gravity feed and the
metering pump  for .pressure feed systems.  Overhead storage can be used to
gravity feed the rotodip as shown in Figure 23.  A centrifugal transfer pump
may also be used, but needs an excess flow recirculation line to the
storage tank, as shown in Figure 24.

Bag and Drum Storage

     In general, bags or drums should be stored in a dry, cool, low humidity
area and used  in proper rotation, i.e., first in, first out.  Bag or drum
loaded hoppers should have storage capacity for eight hours at the nominal
maximum feed rate so personnel are not required to fill or charge the
hopper more than once per shift.

Cylinder and Ton Container Storage

     Whether in storage or in use, cylinders should not be permitted to
stand unsupported.  They should be chained to a fixed wall or support, and
in such a manner as to permit ready access and removal.  Ton containers
should be stored horizontally, slightly elevated from ground or floor level,
and blocked to prevent rolling: a convenient storage rack is obtained by
supporting both ends of containers on rails of I-beams.  Ton containers should
not be stacked or racked more than one high unless special provision is made
for easy access and removal.  Chlorine cylinders and containers should be
protected from impact, and handling should be kept to a minimum.  Full and
empty cylinders and ton containers should be stored separately.

                                     88

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90* BEND
4' Min. Rod.
                                       DUST COLLECTOR
                                          SAFETY VALVE
                                           HIGH LEVEL
                                           INDICATOR
                                           LOW LEVEL
                                           INDICATOR
                                            VIBRATOR
 4" PIPE
 60ฐ CONE
 QUICK
COUPLING
\UU ป ^*" i
F
G— - 	
.•
\;

                              • *
                     To Feeder
                                           (OR AIR PADS)
                               •ffgj^f
             Figure  22,  Typical bulk storage tank.
                          89

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                                  OVERHEAD
                                   STORAGE
                                     TANK
                               Control
                               valve-j
          -Rotodlp—type
           feeder
                                                                Relief
                                                                valve
                                                                        /Back pressure
                                                                        V valve
                                       Rotameter

                                                                 Metering pump
 Gravity feed
                             Gravity feed
                                                                           Gravity feed
 Figure 23.   Alternative  liquid feed systems  for  overhead  storage.
                           Pressure feed
       f Rotodlp—type feeder
Control valve

      Rotameter
                               Reclrculatlon
Gravity feed
            Transfer pump
                                   GROUND
                                   STORAGE
                                    TANK
                          Relief
                          valve
                 Centrifugal
                 feed pump
 ,1.1
g
                            Pressure
                             feed
                                                        Metering


Figure  24.   Alternative liquid  feed  systems for ground  storage.
                                                                         -Back pressure
                                                                             valve
                                         90

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     Storage areas should be clean,"cool, wel^Ventilated, and protected
from corrosive vapors and continuous dampness.  Cylinders and ton containers
stored indoors should be in a fire-resistant building, away from heat sources
(such as radiators, steam pipes, etc.), flammable substances, and other
compressed gases.  Subsurface storage areas should; be avoided, especially
for chlorine and sulfur dioxide.  If natural ventilation is inadequate,
as would be the case for chlorine, storage and use areas should be equipped
with suitable mechanical ventilators,  Cylinders and ton containers stored
outdoors should be shielded from direct sunlight and protected from
accumulations of rain, ice and snow.     ;

     All storage, handling, and use areas should be of such design that,
personnel can quickly escape in emergencies.  It is generally desirable
to provide at "least two ways to exit.  Doors'  should open out and lead to
outside galleries or platforms, fire escapes, or other unobstructed areas.

PIPING AND HANDLING MATERIALS                    .                               •'.

     Piping and accessories for transporting  and feeding various chemicals
should be provided qnly after specific chemicals have, been selected for
use in the treatment plant.  Care must be taken to use only materials      ^     -
which are compatible with  each  chemical.  For example, many chemical handling
systems require special materials  of construction and special  types of:

      •  Piping and Transport Channels

      •  Pumps

      •  Valves

      •  Gaskets     ป                       '              ' ''  ""••*"'

     Table 24 shows a summary of acceptable materials for piping and  ...
accessories for several commonly  used  chemicals.  This table is .not all-  .
inclusive, but will provide the operator with a quick reference on material
compatibility for most common chemicals.  Because sodium hydroxide  (caustic
soda) is .particularly dangerous to handle  and requires special considera-
tion, more detailed  information on feeding and handling equipment  for  this
chemical.is listed  in Table  25. The operator .also is  referred  to  the Appendix
of this manual for  a more  general'listing of  acceptable handling materials
for each  chemical.                ,     '

MANUAL  AND FLOW PACING "CONTROL  .FOR,,CHEMICAL FEED  SYSTEMS

      There  are three frequently encountered chemical feed systems:   (1)  dry
 feeders,  (2)  solution feeders,  and (3) gas  feeders.   Each type of feeder
 should  have  one or more means  to  adjust the  chemical feed rate (dosage)
 easily.   The adjustment(s) may  be manual or  flow pacing and must  be accurate,
 repeatable,  and easy to change.  They should  also provide the broadest
 possible adjustment span from minimum to maximum feed rate.   Typical ranges
 are 10:1 to , 20.: 3Ubut, greater .ranges are. possible,  as shown previously,.in,.Table 23.

                                      91   •

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                                 TABLE 24
Compatible Materials for Piping and Accessories of Commonly Used Chemicals
CHEMICAL
ALUM
PIPES
VALVES
SODIUM ALUMINATE
PIPES
FERRIC CHLORIDE
PIPES
VALVES
FERRIC SULFATE
PIPES
LIME
PIPES & CHANNELS
PUMP IMPELLER LINING
SODIUM CARBONITE
PIPING
SODIUM HYDROXIDE
PIPING
CARBON DIOXIDE
(COOL & DRY)
CARBON DIOXIDE
(HOT & MOIST GAS)
CARBON DIOXIDE
(SOLUTION)
POLYMER (DRY)
PIPING

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 * FRP-Fiber reinforced plastic
                                    92

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                            TABLE 25

           Materials Suitable for Caustic Soda Systems
         Components
Rigid Pipe

Flexible Connections



Diluting Tees

Fittings

Permanent Joints

Unions

Valves - Non-leaking (Plug)
   Body
   Plug

Pumps (Centrifugal)
   Body
   Impeller
   Packing

Storage Tanks
Recommended Materials for Use With
       50% NaOH Up to 140ฐF

Standard weight black iron

Rigid pipe with ells or swing
joints, stainless steel or
rubber hose

Type 304 stainless steel

Steel

Welded or screwed fittings

Screwed steel
Steel
Type 304 stainless steel
Steel
Ni-Resist
Blue asbestos

Steel
                                93

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Dry Feeders

     Most dry feeders are of the belt, grooved disc, screw, or oscillating
plate type.  The feeding device (belt, screw, disc, etc.) is usually driven
by an electric motor.  Many belt feeders, particularly gravimetric type
feeders, also contain a material flow control device such as a movable gate
or rotary inlet device for metering or controlling the flow of chemical to
the feed belt.

Volumetric Dry Feeders—
     Most volumetric dry feeders are of the rotating screw or disc type,
but the belt and rotary star valve types are also used.  Generally, the
screw or disc type is driven by an electric motor through a gear reducer
drive.  In some cases the drive assembly (excluding the motor) contains
a variable speed or a linkage adjustment which allows feed rate changes.
Otherwise, the feed rate adjustment must be made directly to the motor
drive.

     Manual Feed—Manual dosage adjustment of volumetric dry feeders is
accomplished by one or more of the following means:
     1.
Drive motor for feed screw, belt, disc, or rotary valve.
a.  Manual variable speed.
b.  Percentage timer control motor which operates on a run-stop
    repeat cycle with run time set by percentage timer and adjust-
    able from zero to 100 percent of the total cycle.  Typical
    total run-stop cycle times are 15, 30, 60 seconds.  For a
    system set up on a 60-second basis the following is typical
    operation:
                 Percentage
                timer setting

                    100
                     75
                     50
                     25
                    ,  0
                            Run time,
                             seconds

                               60
                               45
                               30
                               15
                                0
Off time,
 seconds

     0
    15
    30
    45
    60
         c.  Manually adjustable speed reducer or adjustable linkage
             on drive assembly.

     2.  Control gate for belt feeder.
         a.  Manual setting of gate position to allow more or less material
             on belt.

     Flow Pacing—Automatic proportioning of volumetric dry feeders to flow
(commonly called flow pacing) is readily accomplished for a variety of flow
signals.  The more common flow and control signals are:

     a.  Pulse duration  (on-off), with frequently used cycle times of 15,
         30, and 60 cycles.
                                    94

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     b.   3 - 15 psi pneumatic

     c.   4 - 20 or, 10 - 50 milliampere

     d.   1 - 5 'volt d.c.             ,           ,        ......     ,

     Most modern feeders can accept one or more of the flow and control
signals.  If the feeder will, not accept the particular signal available,
signal converters are readily available to convert the signal to one that
the feeder will accept.  For example, a 3 - 15 psi pneumatic signal can
be converted to a 4- 20 mA signal.  Signal converters are relatively
inexpensive and"are reliable.

     If a^volumetric feeder is automatically flow-proportioned, a means
still must be available for setting the feed dosage.  Typically, this is
accomplished In one of two ways.
     1.
     2.
A "manual feed rate control" built into the feeder which modifies
the automatic proportioning signal within the feeder control system.

A separate.manual adjustment such as a mechanical linkage or feed
gate adjustment, or a manual speed adjustment on the gear reducer
drive system.
 Gravimetric Dry Feeders—

     Manual Feed— A gravimetric  dry  feeder has  a built-in  control  system
 to maintain a  constant  feed weight  rather  than volume  for any  given dosage
 setting.   For  manual feed  systems,  an operator dosage  adjustment  is provided
 as part of this gravimetric control system.   The feed  belt  is  weighed
 continuously,  establishing automatic  internal control  of gate  position (or
 rotary inlet valve speed)  to  maintain a constant belt  weight for  a  given
 dosage setting.                     . •

      Flow Pacing—The simplest method to obtain  automatic proportioning
 control is to  provide a variable  speed drive  for the belt.  The automatic
 proportioning  control can  be  used to  vary  the belt-drive motor speed.

      If the  feeders  are to be shut down automatically, for  instance when
 incoming wastewater  flows  are low and not  all feeders  are required, provisions
 should be made for shut-down  and  start-up  of  system components such as:

      a.  The  feeder      .                                 ,

      b.  Storage  bin vibrators       '

      c.  Water supply to dissolvers
                           -^          - • •              .       -        -.

      d.  Mixers

      e.  Solution transfer pumps

                                .95

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     Dissolver water supply and mixer should operate for an adjustable time
delay after the feeder is stopped to prevent chemicals from settling in
the dissolver.

Solution Feeders

     The most common solution feeders are motor-driven diaphragm and plunger
type feed pumps.  Generally, these pumps have a built-in stroke adjustment
mechanism which permits variation of the output feed rate.

Manual Feed—
     For manual dosage control, the motor would operate at a constant speed
and the operator could adjust the dosage with the stroke adjustment.

Flow Pacing—
     Automatic proportioning control can be accomplished readily in one of
the following ways:

     1.  Modification of drive motor to provide variable speed or on-off
         propert ioning.

     2.  Installation of an automatic stroke adjuster.

     The drive motor can be set up to operate at variable speeds proportional
to pneumatic or electric signals.  On-off pulse duration signals can be applied
directly to the motor starter so that the motor operates on and off in
proportion to the signal.  This involves many start-stop cycles for the motor
and it is recommended that only three phase motors be used for this type of
duty.  When the automatic proportioning is accomplished with the drive motor,
the manual stroke adjustment is still available for operator-adjusted manual
dosage changes.

     Automatic stroke adjusters can be installed in place of the manual
adjuster on most feeders.  The automatic adjusters will accept various analog
control signals, including pneumatic and electric.  Obviously, these automatic
stroke adjusters can be used for automatic proportioning, but in most cases
there are not manual settings available for manual dosage adjustments.  In
some cases, a manual dosage adjustment can be incorporated into the automatic
stroke adjustment mechanism or a manual variable speed motor drive can be
provided for operator manual dosage adjustment.  Probably the most satisfac-
tory arrangement is to proportion automatically with a variable speed or pulse-
duration motor drive, and to leave the manual stroke adjuster for operator
dosage adjustments.

     If the solution feed system is to be started and stopped with plant
operation or on some other basis, consideration must be given to starting
and stopping auxiliary systems such as the solution feeder, dilution water,
transfer pumps, mixers, and similar equipment.

     There are a number of solution batching and feed systems now on the
market, particularly for polymers.   These systems automatically produce a

                                    96

-------
feedable polymer solution from dry polymer.  Typical systems include a dry
polymer storage hopper, dry feed, wetting, a dissolver tank with mixing,
a feed tank, and solution feeders.  Most of these systems are sold as a pre-
engineered package and can be supplied for manual control, automatic propor-
tioning and for automatic start and stop operation.  Generally, these systems
use solution feed pumps for metering and the previous comments concerning
solution feeders are applicable.

Gas Feeders

     Most modern gas feeders are vacuum operated.  The gas is accurately
metered through an orifice with a fixed pressure drop across the orifice.
For adjustment of gas feed rate the orifice size can be changed manually or
automatically.

Manual Feed—
     Most small, inexpensive gas feeders have provisions  for.manual adjustment
of the orifice size to change the gas-flow rate  (dosage).  This adjustment
is made with a knob on the front of the feeder.  Normally the gas flow rate
is indicated by a visual flow indicator calibrated in pounds per day.

Flow Pacing—                   ,                                .    -         .
     Gas feeders may be automatically proportioned in a number of ways.  Two
common methods are variable vacuum control and automatic  positioning  of  the
orifice control.                                          .

     Variable Vacuum Control—Variable  vacuum control  systems  are  an  economical
method of  automatically  proportioning gas feeders.   The  vacuum control  system
 consists .basically, of.-a  vacuums-producing-device, such  as the gas  injector,  a
 restricting orifice and  an intermediate vacuum transmitter.   The primary flow
 signal is  converted to a proportional vacuum signal which is applied  to the
 vacuum-regulating valve  on the. downstream side of the  gas feeder  orifice.
 The pressure ahead of the orifice is maintained at a constant value by the
 inlet gas  pressure regulating valve. The gas feed rate  is  varied  automatically
 as this proportioning vacuum signal changes with the flow.

      Changes in the control vacuum signal cause  comparable  changes  in the
 pressure downstream of the orifice and, therefore, in the differential
 across the orifice.  Since the gas flow squared is proportional to the
 differential pressure across the orifice, the gas-feed rate will vary in
 accordance with the control-vacuum signal.

      Automatic Positioning—Automatic positioning of the gas-flow control
 orifice is accomplished with a power positioner which can be selected to
 operate from a number of input signals such as:

      a.  3-15 psi pneumatic

      b.  4 - 20 or 1 - 50 milliampere electric

      c.   1-5 volt d.c. electric
                                      97

-------
     d.  Potentiometer position

     e.  Pulse duration

     f.  Ptijse frequency

     g.  Others by special application

     When an automatic proportioning positioner is used, a manual dosage
control knob is provided on the chlorinator so the operator can make manual
adjustments of dosage.  This adjustment modifies the automatic proportioning
over a wide range.

     Almost all gas-feeder control schemes are based on the use of variable
vacuum or the use of an orifice-proportioning positioner.  In most cases,
the manual dosage adjustment is retained for operator use.

     Gas feeders can be started and stopped simply by starting or stopping
water flow through the injector.  Usually this is all that is necessary to
start or stop a typical gas-feed system such as a chlorinator or sulforator.


AUTOMATIC CONTROL FOR CHEMICAL FEED SYSTEMS

     Various automatic control schemes are possible for chemical feed systems
beyond the automatic flow proportioning discussed for each type of feeder.
For example, automatic pH control is possible using a pH sensor, controller,
and pH adjustment chemical feeder for sodium hydroxide with an automatic
stroke positioner.  Automatic chlorine residual control is possible using a
chlorine residual analyzer, controller, and chlorinator with an automatic
orifice positioner.  These are "feed back" systems where the final control
parameter, such as pH, is controlled by a previous feed of chemical.  "Feed
forward" systems are also possible where a parameter concentration prior to
chemical feed is determined and related to the chemical feed for automatic
control.  An example is ammonia removal by breakpoint chlorination.  Approx-
imately 8 to 10 parts of chlorine are required to remove one part of ammonia.
Therefore, if the ammonia concentration prior to chlorine feed is measured,
the chlorine feed can be proportioned to 8 or 10 times the ammonia
concentration.

     Various types of "feed forward" or "feed back" systems or combinations
can be devised in theory.  The problem is that there are substantial delay
times in such systems which most analog controllers are not designed to
handle.  The delays are mostly hydraulic in the time to change a chemical
feeder setting, get the change to the injection point, process delays to the
sample point, delay in the sample lines and delay in the analyzer.  The
total delay from the time a feed rate is changed until it is read out by an
analyzer can be 5 minutes or longer.  The control results can be unstable
and can lead to wide cycles of the controlled variable.  There are ways of
overcoming these problems with proper design and equipment selection, but
design of such systems is a very specialized art.
                                    98

-------
                                ri.ซ. i+gl       = -"rK^"''1 ' '
     Automatically controlled systems must "be arranged so that auxiliary
systems such as mixers, dilution water, and slakers are started and stopped
as needed.  The point to be emphasized, therefore, is that such systems can
be designed and applied where needed and that chemical feeders are available
for use in such systems.  These systems are complex enough and the analyzers
require maintenance to the point that such systems should not be used  except
where they provide a benefit sufficient to overcome the operational
disadvantages.
                                      99
             _Q

-------
                                    SECTION 4

                                    References
 1.  "Field Manual for Performance Evaluation and Troubleshooting at Municipal
     Wastewater Treatment Facilities," EPA 430/9-78-001, January 1978.

 2.  WPCF, Manual of Practice No. 11, "Operation of Wastewater Treatment
     Plants," 1976.

 3.  AWWA, Manual M20, "Water Chlorination Principles and Practices," 1973.

 4.  "Manual of Instruction for Water Treatment Plant Operators," New York
     State Department of Health.

 5.  "Process Design Manual for Phosphorus Removal," EPA^ Technology Transfer,
     EPA 625/1-76-OOla, April 1976.

 6.  WPCF, Manual of Practice No. 8, "Wastewater Treatment Plant Design,"
     1977.

 7.  "Sludge Handling and Conditioning," EPA 430/9-78-002, February 1978.

 8.  "Lime Handling, Application and Storage," Bulletin 213, National Lime
     Association, Second Edition, May 1971.

 9.  White, G. C., "Handbook of Chlorination," Van Nostrand Reinhold Company,
     1972

10.  "Chlorine Manual," 4th Edition, The Chlorine Institute, 1969.

11.  White, G.C., "Disinfection of Wastewater and Water for Reuse," Van
     Nostrand Reinhold Company, 1978.
                                    100

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                    SECTION 5
PROBLEMS TffilCH CAN BE AIDED BY CHEMICAL ADDITION

-------

-------
                                SECTION 5
            PROBLEMS WHICH CAN BE AIDED BY CHEMICAL ADDITION
     This section of the manual serves primarily as a troubleshooting
guide to help identify problems which can be aided by the addition of
chemicals.  Problems are identified by the treatment process where the
problem would most likely occur.  A possible solution is provided for
each problem, along with a list of possible chemicals for aiding the
problem, advantages and disadvantages of each chemical, and potential
application points.

     While chemical addition may be helpful in many wastewater treatment
processes, it must be recognized that there may be operational alternatives
which are less expensive and more desirable.  OPERATIONAL ALTERNATIVES
SHOULD BE INVESTIGATED THOROUGHLY BEFORE CHOOSING A CHEMICAL ALTERNATIVE
DESCRIBED IN THIS SECTION.  In some cases, short-term correction using
chemicals may be necessary, but the condition causing the problem also
must be identified and corrected.  This is particularly true when the
problem is associated with an industrial discharge, lack of enforcement
of pretreatment requirements, or an overloaded plant. CHEMICALS SHOULD
NOT BE USED AS A SUBSTITUTE FOR GOOD PLANT OPERATING PROCEDURES.

     For more information on troubleshooting and process control, the
operator should refer to "Field Manual for Performance Evaluation and
Troubleshooting at Municipal Wastewater Treatment Facilities," EPA-430/9-
78-001, January 1978.  This manual describes procedures for evaluating
and troubleshooting various unit processes commonly used at wastewater
facilities.  One chapter is devoted to chemical feeding and conditioning,
and other chapters contain information on the use of chemicals in improving
process operations.  Procedures for evaluating process efficiencies also
are included!                       :
                                   101

-------
A.
B.
                             INDEX

                               TO

         PROBLEMS WHICH CAN BE SOLVED BY CHEMICAL ADDITION


          Treatment Processes

Collection Systems

    Pump Stations and Pipelines

Conventional Wastewater Treatment
                                                              Page Number
                                                                  106
        Preaeration	    109
        Grit Removal	    110
        Microscreening 	    Ill
        Primary Clarification  	    112
        Trickling Filter 	    116
        Activated Sludge 	    118
        Rotating Biological Contactors 	    120
        Lagoons	    121
        Secondary Clarification  	    122
        Disinfection	 .    124
        Dechlorination	 .    125

C.  Advanced Waste Treatment

        Tertiary Chemical Clarification  	    127
        Nitrogen Removal	    129
        Filtration	    130
        Activated Carbon Adsorption  	    131

D.  Sludge Treatment and Conditioning

        Anaerobic Digestion  	    133
        Aerobic Digestion  	    135
        Gravity Thickening 	    136
        Flotation Thickening 	    137
        Centrifugation 	    138
        Sludge Drying Beds	    139
        Vacuum Filtration  	 .....  	    140
        Filter Press 	  .....    141
        Land Application of Sludge	    142
                                  102

-------
COLLECTION SYSTEMS
       103

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139

-------
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         a

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                                                 140

-------
                                   SECTION.5

                                  References
1.  "Field Manual for Performance Evaluation and Troubleshooting at
    Municipal Wastewater Treatment Facilities," EPA 430/9-78-001,
    January 1978.                                    ,

2.  "Process Design Manual for Upgrading Existing Wastewater Treatment
    Plants," EPA, Technology Transfer, 625/l-71-004a, 1974.

3.  "Process Design Manual for Phosphorus Removal," EPA, Technology
    Transfer, EPA 625/1-76-OOla, April 19.76.          .   ,        ,     ,

4.  "Process Design Manual for Suspended Solids Removal," EPA, Technology
    Transfer, EPA 625/1-75-003a, January 1975.

5.  "Process Design Manual for Nitrogen Control," EPA, Technology
    Transfer, October 1975.

6.  "Process Control Manual for Aerobic Biological Wastewater Treatment
    Facilities," EPA 430/9-77-006,- March 1977.         .,-.

7.  "Process Design Manual for Sludge Treatment and Disposal," EPA,
    Technology Transfer, 625/1-79-011, September  1979.
                                      141

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        APPENDIX




INFORMATION ON CHEMICALS

-------

-------
                                APPENDIX

                        INFORMATION ON CHEMICALS
     General information on various chemicals is provided in this
section,including uses of the chemical, trade  and common names,
available forms, commercial strength, feeders, storage, safety
considerations, approximate 1979 cost, acceptable handling materials,
and major chemical manufacturers.  For easy reference, the chemicals
are arranged in alphabetical order.

     The information provided in this Appendix is intended to provide,
the operator with basic guidance on the use and handling of different
chemicals.  There is much useful information in the Appendix, but the
operator must be aware of certain limitations.  Most chemicals are
shipped in a variety of forms, quantities, and commercial strengths
which may differ with each manufacturer or supplier.  Consequently,
the Appendix describes the most commonly available form for each
chemical.  Storage and safety information described in the Appendix is
not intended to be complete or absolute.  Sufficient general information
is provided to aid the operator in deciding whether or not to use a
certain chemical; however, detailed information on specific chemicals
should be obtained directly from the supplier before purchasing or using
the chemical in question.

     The cost quotations in this section are approximate 1979 costs
obtained from,the "Chemical Marketing Reporter," November 5, 1979.
The costs reflect the list prices of merchant producers prevailing on
November 2, 1979 for large lots, f.o.b., New York.  The values do not
represent bid and asked prices.  Differences between high and low costs
may be accounted for by differences in quantity, quality or locality.

     Because it is not possible or practical to identify all manufacturers
or suppliers of each chemical, the operator is strongly encouraged to add
his own local supplier to the list wherever possible.  A partial list of
manufacturers is provided in the Appendix only as guidance for locating
a possible source for chemicals which may otherwise be difficult to
obtain.
                                   A-l

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                             APPENDIX INDEX
     Chemical                                                        Paee

Activated Carbon 	   A-3
Aluminum Sulfate	i	   A-4
Anhydrous Ammonia	   A-5
Bentonite	   A-6
Calcium Carbonate	•	   A-7
Calcium Hydroxide	   A-8
Calcium Hypochlorite	   A-9
Calcium Oxide  	   A-10
Carbon Dioxide 	   A-ll
Caustic Soda	   A-12
Chlorine	   A-13
Copper Sulfate	•  •   A-14
Defoamer	   A-15
Diatomaceous Earth 	   A-16
Ferric Chloride  	   A-17
Ferric Sulfate	•  •   A-18
Ferrous Chloride	•   A-19
Ferrous Sulfate	•   A-20
Hydrochloric Acid  .	. . . .	   A-21
Hydrogen Peroxide	   A-22
Lime	   A-23
Magnesium Hydroxide	•	   A-24
Methanol	   A-25
Oxygen (Liquid)  	  .......   A-26
Ozone	   A-27
Polymer	•	   A-28
Potassium Permanganate  	   A-29
Soda Ash	   A-30
Sodium Aluminate	   A-31
Sodium Bicarbonate 	   A-32
Sodium Bisulfite	   A-33
Sodium Carbonate	.  •	   A-34
Sodium Hydroxide	   A-35
Sodium Hypochlorite  	   A-36
Sodium Metabisulf ite	   A-37
Sodium Sulfite  	   A-38
Sodium Thiosulfate	   A-39
Sulfur Dioxide	   A-40
Sulfuric Acid	   A-41
                                   A-2

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                             ACTIVATED  CARBON
TRADE NAMES
  Aqua Nuchar, Norit, Darco, Carbodur
AVAILABLE FORMS
  Bags.r  35 Ib.
  Drums - 5, 25 Ib.
  Bulk -  Carloads  ,
STORAGE
  Bags, bins
APPROX. 1979  COST
  $0.61-$0.65/lb
USES
 Taste, odor,  color and  organics
 removal, dechlorination, sludge
 stabilization,  denitrification.
                                        COMMERCIAL STRENGTH
 10% C (bone char)  to  90% C  (wood
   charcoal)
                                        FEEDERS
 Gravimetric - L-I-W
 Volumetric - helix (Fig. 9)
 Slurry ^ rotodip or diaphragm pump
    '     (Fig. 13)
                                        SAFETY CONSIDERATIONS
'Dusty, smolders  if  ignited.  Isolate
   from flammable materials such as
   rags, chlorine compounds, and all
   oxidizing agents.
HANDLING MATERIALS
  Dry -  iron, steel
  Wet' -  rubber, iron, steel
MAJOR  MANUFACTURERS
  American Norit Company, Inc., 6301 Gli'dden Way, Jacksonville, Florida  32208
  Westvaco Corporation, Chemical Division,  Covington, Virginia  24426,.
  Whitco  Chemical Corporation, 277 Park Avenue, New York, New York  10017
  ICI United  States, Ihc". , Wilmington,  Delaware  19897
  Calgori  Corporation, P.O. Box 1346, Pittsburg, Pennsylvania  15230
                                     A-.3

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                            ALUMINUM SULFATE
TRADE NAMES
Alum, filter alum

AVAILABLE FORMS
Dry
Bags - 100, 200 Ibs
Bbls - 300, 400 Ibs
Drums - 25 100 250 Ibs
Bulk - carloads , tank trucks
Liquid
Rail or truck - 4000 gal (min)

STORAGE
Dry Alum - 30 days max, in dry loca-
tion with dust collectors. Use 60ฐ
min hopper wall slope to prevent
arching.
Liquid - corrosive, store without
dilution above 25ฐF to prevent
crystalization

APFROX. 1979 COST
$146-$165/ton




USES
Coagulation, sludge conditioning,
precipitate P04, remove metals, oil,
organics, BOD/SS.

COMMERCIAL STRENGTH
Powder - 17% Al2 03
Minimum Liquid - 8.3% as Al2 03 or
49% as A12 (804)3.14 H20

FEEDERS
Gravimetric - belt, (Fig. 10,11'), L-l-W
Volumetric - helix (Fig. 9),
universal (Fig. 7)
Solution — rotodip, plunger or
diaphragm pump, (Figure 13 )

SAFETY CONSIDERATIONS
Dry alum is dusty, irritating to
mucous membranes, can cause serious
eye injury.

HANDLING MATERIALS
Solution - Stoneware, lead, rubber, acid-resisting tile, Duriron, plastics,
stainless 316, asphalt, cypress, PVC, Fiberglass
Dry - concrete, steel, iron
MAJOR  MANUFACTURERS
 American Cyanamid, Berdan Avenue,  Wayne, New Jersey  07470
 Allied Chemical Corporation, P.O.  Box 1139R, Morristown, New Jersey  07960
 Ashland Chemical Company, P.O.  Box 2219, Columbus, Ohio  43216
 Dixie Chemical Company, 3635 W. Dallas Street, Houston, Texas  77019
 Cities Service Company, 3445 Peachtree Road, Atlanta, Georgia  30302
 Stauffer Chemical Company, New York,  New York
                                    'A-4

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                          ANHYDROJJS AMMONIA
 TRADE NAMES
 Ammonia
USES
Chlorine-ammonia  treatment, anaerobic
digestion, nutrient for aerobic
bacteria
AVAILABLE FORMS
 Cylinders - 50, 100, 150 lb.

 Tank  Cars - 50,000 lb.
                                        COMMERCIAL STRENGTH
99% to 100% NH3
STORAGE
 Pressure cylinders
                                        FEEDERS
                                        Gas  Feed
APPROX. 1979 COST
 $120-$140/ton
                                        SAFETY CONSIDERATIONS
Pungent,  irritating odor, liquid causes
burns.  Prevent contact with chlorine
compounds, mercury, iodine, and bromine
HANDLING MATERIALS
 Iron,steel, glass,  nickel, Monel, neoprene, Penton
MAJOR MANUFACTURERS
PPG Industries,  Inc., Chemical Div.,  One  Gateway Center, Pittsburgh, PA  15222
                                   A-5

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                                BENTONITE
TRADE NAMES
Colloidal clay,  WLlkinite, Volclay
USES
Coagulation aid as  a weighting agent.
AVAILABLE FORMS
Bags - 50,  100 Ib
Bulk - carloads, railcars
                                        COMMERCIAL STRENGTH
      Not Applicable
 STORAGE
 Dry powder  or granules.  Provide
  hopper agitation.
                                        FEEDERS
Gravimetric - L-I-W, belt (Fig.  10,11)
Solution - diaphragm pump, plunger
  pump (Fig.  13)
Volumetric -helix  (Fig. 9),  universal
               (Fig. 7)
 APPROX. 1979  COST
 $28-$30/ton
                                        SAFETY CONSIDERATIONS
     No significant hazards
 HANDLING  MATERIALS
Iron, steel, Hypalon, Tyril
 MAJOR MANUFACTURERS
Dow Chemical Corp.,  2030 Dow Center, Midland, MI48840
                                     A-6

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                            CALCIUM CARBONATE
TRADE NAMES
Calcite,  limestone, whiting,  chalk
USES
Neutralizing agent, corrosion control
AVAILABLE FORMS
Bags - 50 Ib
Drums ~
Bulk - carloads
                                        COMMERCIAL STRENGTH
96 to 99%
STORAGE
 Noncorrosive;  store in concrete or
 steel bins.
 Provide hopper agitation.
                                        FEEDERS
                                        Gravimetric -  L-I-W,belt (Fig. 10,11)
                                        Volumetric -  helix (Fig. 9)       "
                                        Slurry -.diaphragm pump (Fig. 13')
APPROX. 1979  COST
$54/ton
                                        SAFETY CONSIDERATIONS
 Slight dust hazard.~
 Use protective clothing and devices
 to avoid contact.
 HANDLING MATERIALS
Iron,  steel, rubber
MAJOR  MANUFACTURERS
Clark Corp., P.O. Box 500,  Windsor, WI  53598
                                     A-7

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CALCIUM HYDROXIDE
TRADE NAMES
Hydrated lime, slaked lime

AVAILABLE FORMS
Bags - 50 Ib ,
Bbls - 100 Ib.
Bulk - carloads


STORAGE
Same as CaO but bin agitation must
be provided . Hopper should slope 65 .

APPROX. 1979 COST
$33-$43/ton


USES
Coagulation, pH adjustment, acid
neutralization, sludge conditioning,
precipitate POi^

COMMERCIAL STRENGTH
Ca (OH) 2 - 82-95%
CaO - 62-72%

FEEDERS
Gravimetric - L-I-W, belt (Fig. 10,11)
Volumetric - helix (Fig. 9), universal
(Fig.TJ
Slurry - rotodip, diaphragm or plunger
pump (Fig. 13 )

SAFETY CONSIDERATIONS
Caustic, irritant, dusty. Avoid eyes,
nose and respiratory system.

HANDLING MATERIALS
Rubber, iron, steel, cement, Hypalon, Penton, PVC, asphalt (no lead)

MAJOR MANUFACTURERS
Bethlehem Mines Corp., Annville, PA 17003
Mississippi Lime Co., 7 Alby Street, Alton, IL 62002
Ashland Chemical Co., P.O. Box 2219, Columbus, OH 43216
Flintkote Co., 1650 S. Alameda Street, Los Angeles, CA 90021
          A-8

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                           CALCIUM.HYPOCHLORITE
 TRADE NAMES
 HTH,  perchloron, Pittchlor
                                          USES
Disinfection, slime control,
deodorization
 AVAILABLE FORMS
 Cans  -  5  Ib
 Drums  -  100, 300, 800 Ib,
 Bbls - 415 Ib.
COMMERCIAL STRENGTH
 65% available Chlorine
Must be stored dry and cool;  avoid
contact with organic matter
 STORAGE
                                         FEEDERS
                                         LIQUID:
                                               Rotodip, diaphragm pump (Fig.  13;
 APPROX.  1979 COST
$0.70/lb
                                         SAFETY CONSIDERATIONS
Corrosive

  Avoid contact with organic matter.
 HANDLING  MATERIAL!
Ceramic, glass,  rubber, PVC, Penton, Tyril, Hypalon,  vinyl,  stoneware, wood
(no tin)
MAJOR MANUFACTURERS
Ashland Chemical Co., P.O. Box 2219, Columbus,  OH  43216         ~~''—	
Dixie Chemical Co., 3635 W. Dallas St., Houston,  TX 77019
PPG Industries,  Inc., Chemical Div., One Gateway  Center, Pittsburgh, PA  15222
Penwalt Corp.,  Inorganic Chemicals Div., Three  Parkway, Philadelphia, PA  19102
                                     A-9

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                               CALCIUM OXIDE
TRADE NAMES
 Quicklime, unslaked lime, burnt lime
USES
Coagulation, pH adjustment,  acid
neutralization, sludge conditioning,
precipitate
AVAILABLE FORMS
 Bags - 50,  100 Ib.
 Bbls - 100  Ib.
 Bulk - carload
                                        COMMERCIAL STRENGTH
 70-96%  CaO (can be poor quality
  .below 85%)
STORAGE
 Keep dry with container closed.
 Store bags on pallets,  60 'flays maxi-
 mum.  Provide dust collectors for bin
 storage and slope bin outlet 60  .
                                        FEEDERS
 Gravimetric^ - belt (Fig. 10,11)  or
              L-I-W
 Volumetric - universal (Fig. 7), helix
                (Fig. 9)

 Also  see Fig- 15 and 16 for lime
   slakers.
 APPROX.  1979  COST
  $31-$33/ton
                                         SAFETY  CONSIDERATIONS
Unstable,  caustic,  irritant, dusty.
Lime dust and hot slurry  can cause
severe burns.
 HANDLING  MATERIALS
 Rubber, iron, steel,  concrete, Hypalon, Penton, PVC, asphalt
 MAJOR MANUFACTURERS
 Pfizer Inc., MPM Div.,  235 E.  42nd  Street, New York, NY  10017
 Bethlehem Mines Corp.,  Annville,  PA  17003
 Mississippi Lime Co., 7 Alby Street,  Alton, IL  62002
 Martin Marietta Cement, Southern  Div.,  18th Floor, Daniel Bldg, Birmingham, AL
    35233
 Ohio Lime Co., Woodville, OH  43469
 Flintkote Co., 1650 S.  Alameda Street,  Los Angeles, CA  90021
 U.S. Gypsum Co., Chemicals Division,  101 S. Wacker Dr., Chicago, IL 60606
                                     A-10

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                              CARBON  DIOXIDfe
TRADE NAMES
 Dry ice,  carbonic acid gas
USES	
Recarbonation,  coagulation/floe aid,
pH adjustment
AVAILABLE FORMS
 Cylinders - 20, 50 Ib.
 Trucks - 10, 20 tons
 Railcar - 30, 50 tons
                                         COMMERCIALS TREN 6 TH
99.5%
STORAGE
 Pressure cylinders
 Liquid systems usually require
 on-site bulk  storage.
                                         FEEDERS
                                         Gas  feeder
APPROX. 1979  COST
  $40-$80/ton  (1974)
                                         SAFETY CONSIDERATIONS
  Colorless,  odorless, nonflammable
  gas.   Solutions  of CC>2 in water are
  very reactive and, form carbonic acid.
HANDLING MATERIALS
 As  dry gas;  iron, steel

 As  moist gas;  316SS, plastic
MAJOR  MANUFACTURERS
 Airco,  Inc., Hopewell, VA; Lawrence,  KS
 Air Products & Chemicals, Inc., Pensacola,  FL
 Allied  Chemical Corp.,_Geismar, LA;  South Point, OH; Omaha, NB
 American  Cyanamid Co.,"New Orleans,  LA
 Chemetron Corp., Delaware City, DE;  Morris,  IL; Toledo, OH; Woodstock, TN;  other
 Chevron Chemical Co., Richmond, CA;  Fort  Madison, IA
 Church  &  Dwight Co., Inc., Green River, WY
                                   Ar-11

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                           CAUSTIC SODA
TRADE NAMES
 See Sodium Hydroxide
AVAILABLE FORMS
STORAGE
 APPROX.  1979  COST
                                    USES
                                    COMMERCIAL STRENGTH
                                    FEEDERS
                                     SAFETY CONSIDERATIONS
 HANDLING  MATERIALS
 MAJOR  MANUFACTURERS
                                 A-12

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                                 CHLORINE
 TRADE NAMES
Chlorine gas, liquid  chlorine
USES
Disinfection,  slime  control, taste and
odor control.
AVAILABLE FORMS
Cylinders - 100,  150, 200, 2,000 Ib.
Tank cars - 16,  30,  55 tons
                                         COMMERCIAL STRENGTH
99.8% C12
 STORAGE
Pressure cylinders
                                         FEEDERS
                                             Gas chlorinator
 APPROX. 1979  COST
$195 - $230/ton
                                         SAFETY CONSIDERATIONS
Pungent,  noxious,  corrosive gas,
health hazard.   Prevent contact with
ammonia, acetylene,   all petroleum
gases, hydrogen, turpentine, arid
benzene.
 HANDLING MATERIALS
Gas - Copper,  iron,  steel
Liquid - glass,  rubber, lead, silver
MAJOR MANUFACTURERS
Allied Chemical  Corp., P.O. Box 1139R, Morristown,  NJ  07960
Ashland Chemical Co., P.O. Box 2219, Columbus,  Ohio  43216
Pennwalt Corp.,  Organic Chemicals Div.  Three Parkway,  Philadelphia, PA  19102
PPG Industries,  Inc., Chemical Div., One Gateway Center, Pittsburgh, PA  15222
Dixie Chemical Co., 3635 W. Dallas St., Houston, TX  77019
                                    A-13

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                             COPPER SULFATE
TRADE  NAMES
Blue vitriol,  blue stone, cupric
sulfate
                                        USES
 Algae control,  root control in sewers
AVAILABLE FORMS
 Bags - 100  Ib.
 Bbls - 450  Ib.
 Drums -
 Bulk - carloads
                                        COMMERCIAL STRENGTH
                                        99% CuSO,
STORAGE
 Store as received; chemical and its
 solution are corrosive.
                                        FEEDERS
                                        Gravimetric - L—I-W
Volumetric -  helix  (Fig. 9)
             universal  (Fig. 7)
Solution - rotodip, diaphragm or
           plunger  pump  (Fig. 13)
 APPROX. 1979  COST
 $42/100 Ib.
                                        SAFETY CONSIDERATIONS
                                        Poisonous in large amounts
 HANDLING  MATERIALS
 Rubber,  ceramic, 316SS, vinyl,  Hypalon, PVC, Viton, epoxy,  Tyril, asphalt
 MAJOR MANUFACTURERS
 Easton R.S. Corp., 4907 Farragut Rd.,  Brooklyn, NY  11203
 Cities Service Co., Chemical Group Marketing, 3445 Peachtree Rd., N.E.
   Atlanta, Georgia  30326
 The Anaconda  Co., Great Falls, MT
 Southern California Chemical Co., Inc.,  Bayonne, NJJ Garland, TXJ
   Santa Fe Springs, CAJ Union, IL
                                    A-14

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DEFOAMER
TRADE NAMES
Exfoam 440, Wyandotte defoamer

AVAILABLE FORMS
Liquid - 5 and 55 gaL drums, bulk
Paste - 2 Ib., bulk , ' '
Dry - 2 Ib. bricks, bulk

STORAGE
Store in tight containers in cool,
shaded areas.
(Check with manufacturer for specific
defoamer)

APPROX. 1979 COST
$0.47-$0.66/lb.
USES
Foam removal in lagoons and
sludge
activated •

COMMERCIAL STRENGTH
Not applicable

FEEDERS
Solution - diaphragm pump (Fig. 13)


SAFETY CONSIDERATIONS
Avoid excessive handling, contact
with eyes, and ingestipn. Some ,
hydrocarbon base def darners may be
flammable.

HANDLING MATERIALS
Most common materials are acceptable. ••.•„••• •
Check with manufacturer for specific defoamer.
• •- 	 - 	
MAJOR MANUFACTURERS
Drew Chemical Corp., 701 Jefferson Rd. , Parsippany, NJ 07054
Hercules Inc. , Industrial Systems Dept., Wilmington, Delaware 19899
Dearborn Chemical Div. , Chemed Corp., 300 Genessee St., Lake Zurich
BASF Wyandotte. Corp, Wyandotte, Michigan 48192
, IL 60047
  A-.15

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                           DIATOMACEOUS  EARTH
TRADE  NAMES
 Diatoms, celite, dicalite,  celatom,
 supercel, speedex, speed flow
USES
Filter aid, sludge dewatering with
pressure and vacuum.filters
AVAILABLE FORMS
 Bags  -  50 Ib.
 Bulk
                                        COMMERCIAL STRENGTH
                                             Not applicable
STORAGE
  Store dry as received
                                        FEEDERS
                                        Volumetric- helix (Fig. 9)
                                        Gravimetric^, belt (Fig. 10,11), L-I-W
                                        Slurry - diaphragm pump (Fig.13)
 APPROX. 1979  COST
  Variable, check with supplier.
                                        SAFETY CONSIDERATIONS
                                         Do not breathe excessive amounts of
                                                 dust.
 HANDLING MATERIALS
  Iron, steel, rubber,  Tyril, Hypalon
 MAJOR MANUFACTURERS
  Johns-Manville, Filtration &  Industrial Minerals Div., P.O. Box 5108,
    Denver, Colorado  80217
  Dicalite Div., GREFCO, Inc.,  3450 Wilshire Blvd., Los Angeles, CA  90010
                                     A-16

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FERRIC CHLORIDE
TRADE NAMES
Ferrichlor-j chloride of iron
.. • , ,../ ...
AVAILABLE FORMS
Solution
Car boys - 5, 13 gal. ..
Crystal
Kegs - 100, 300, 450 Ib.
Drums - 150, 350, 650 Ib.
" *

STORAGE
Store in tight containers as shipped
with free vent, coirosive in liquid
form

APPROX. 1979 COST
$100-$120/ton


USES
Coagulation at pH 4-11, :sludge
conditioning, precipitate PO,

COMMERCIAL STRENGTH
Solution - 35-45% FeCl^, 12-17% Fe
Crystal - 60% FeCl , 20% Fe
Anhydrous - 98% FeCl3, 34% Fe

FEEDERS
Solution - Diaphragm pump (Fig. 13.),
rotodip
No dry feed.

SAFETY CONSIDERATIONS
Corrosive in liquid form, avoid
contact with skin and -eyes. Induce
vomiting if ingested. . .

HANDLING MATERIALS
'Epoxy, rubber, ceramic, Hypalon, PVC, Penton, vinyl, stoneware, synthetic resin

MAJOR MANUFACTURERS
Ashland Chemical Co. , P.O. Box .2219, Columbus, ; Ohio 43216
Engineering Chemical Services, Inc., 40 Fulton St., New Brunswick, NJ 08902
Gulf Chemical & Metallurgical Co., P.O. Box 2130, Highway 519,
Texas City, Texas 77590 ' .
Dow Chemical Co., 2020 Dow Center, Midland, Michigan 48640
Pennwalt Corp., Inorganic Chemicals Div. , Three Parkway, PA 19102
Imperial West Chemicals, Antioch, California
/ . '
     A-17

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FERRIC SULFATE
TRADE NAMES
Ferrifloc, ferriclear, iron sulfate,
ferrisul

AVAILABLE FORMS
Bags - 50, 100, 175 Ib.
Drums -200, 400, 425 Ib.
Bulk - car loads and truck loads of
50, 100 Ib. bags.



STORAGE

Store dry in tight containers of steel
or concrete and avoid moisture . Hopper
walls should slope 36% min. Do not
mix with quicklime in conveying or
dust vent systems.


APPROX. 1979 COST
$60-$74/ton

HANDLING MATERIALS
316SS, glass, rubber, plastic^ ceramic,
epoxy, Tyril, synthetic resin

MAJOR MANUFACTURERS
Cities Service Co., I.C.D., 3445 Peach
Gulf Chemical & Metallurgical Co., P.C




















P^


tr<
. ]
USES
Coagulation at pH 4-6 and 8.8-9.2,
precipitate PO,

COMMERCIAL STRENGTH
68-94% Fe (S04)3
18.5-26% Fe

FEEDERS
Gravimetric - L-I-W
Volumetric - helix (Fig. 9),
universal (Fig. 7)
Solution — rotodip, diaphragm or
plunger pump (Fig. 13.)

SAFETY CONSIDERATIONS
• J 1 4- • 4 ,1 l>sN/4*
Corrosive in solution, avoid, oouy
contact




7C, Hypalon, lead, . vinyl, Penton,


se'Rd., N.E., Atlanta, GA 30326
3ox 2130, Hwy 519, Texas City, TX 77590
      A-18

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                              FERROUS CHLORIDE
TRADE NAMES
Waste pickle liquor
USES
PC>4 removal,  sludge conditioning
AVAILABLE FORMS
Bulk - tank trucks, car loads at
  2,000 gal.
Drums - 50 gal.
                                        COMMERCIAL STRENGTH
                                        20-25% FeCl2 or  10% available iron
 STORAGE
Since ferrous chloride may not always
be available, provide for storage and
handling of ferric  chloride.
                                        FEEDERS
                                        Solution -
                                          Diaphragm pump  (Fig. 13),
                                          Rotodip
 APPROX. 1979  COST
 $95-$103/ton
                                        SAFETY CONSIDERATIONS
                                         Slightly less corrosive  than ferric
                                         chloride
 HANDLING  MATERIALS
 MAJOR MANUFACTURERS
 By-Products Management Inc.,  5220 East Avenue,  Countryside, IL  60525
                                    A-19

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FERROUS SULFATE
TRADE NAMES
Green vitriol, copperas, iron sulfate

AVAILABLE FORMS
Bags - 50, 100 Ib.
Bbls - 400 Ib.
Bulk - Carloads and truckloads

STORAGE
Oxidizes in moist air, cakes in
storage at temperatures above 68ฐF.

APPROX. 1979 COST
$80/ton


USES
Odor control, precipitate P04,
coagulation at pH 8.8-9.2, sludge
conditioning

COMMERCIAL STRENGTH
55-58% Fe S04 (20-2 IX Fe) .

FEEDERS
Gravimetric - L-I-W
Volumetric - helix (Fig. 9) , universal
(Fig. 7)
Solution - diaphragm or plunger
pump (Fig. 13)

SAFETY CONSIDERATIONS
Solution is acidic, mixing with
quicklime may cause fire, avoid body
contact

HANDLING MATERIALS
Asphalt,, concrete, lead, tin, wood, rubber, PVC, vinyl, Penton, epoxy,
Hypalon, ceramic, Tyril
Solutions - Lead, rubber, iron, plastics, 304SS


MAJOR MANUFACTURERS
Ashland Chemical Co., P.O. Box 2219, Columbus, Ohio 43216
By-Products Management Inc., 5200 East Ave., Countryside, IL 60525
American Cyanamid Co., Berdan Ave., Wayne, NJ 07410
National Lead, St. Louis, Missouri
Gulf Chemical, P.O. Box 2130, Hwy 519, Texas' City, Texas 77590
      A-2Q

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HYDROCHLORIC ACID
  •
TRADE NAMES
Muriatic acid

AVAILABLE FORMS
Glass bottles
Carboys
Drums
Tank cars

STORAGE
Store as received; highly corrosive
to metals. ,

APPROX. 1979 COST
$35 - $63/ton
USES
Neutralization of alkaline waste,
pH adjustment

COMMERCIAL STRENGTH
Concentrated: 37%- 38% HC1
18ฐBe - 27.9% HC1, 20ฐBe - 31.5%
22ฐBe - 35.2% HC1
HC1

FEEDERS
Solution - diaphragm pump (Fig.

13)

SAFETY CONSIDERATIONS
Fuming , pungent, toxic liquid;
avoid skin contact, use rubber
and safety glasses.
gloves

HANDLING MATERIALS
Penton, rubber, polyethylene, vinyl, Hypalon, Viton, Tyril .

MAJOR MANUFACTURERS
Allied Chemical Corp., Baton Rouge, LA; Danville, IL, Elizabeth, NJ;
Mounds ville, WV; Syracuse, NY
American Chemical Corp., Long Beach, CA .'..-•.
BASF Wyandotte Corp., Wyandotte, MI - ,
Continental Oil Co., Baltimore, MD
Dow Chemical USA, Freeport, TX; Midland, MI; Plaquemine, LA
E.I. du Pont Inc., LaPort, TX; Cleveland, OH; Linden, NJ
Hercules, Inc., Hopewell, VA; Parlin, NJ; Brunswick, GA
Monsanto Co., Everett, MAJ Sauget, IL
Pennwalt Corp, Calvert City, KY; Portland, OR; Tacoma, WA; Wyandotte, MI
Stauffer Chemical Co., Cold Creek, AL; Mt. Pleasant, TN; Dominguez, CA
      A-21

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HYDROGEN PEROXIDE
TRADE NAMES
Hydrogen peroxide

AVAILABLE FORMS
Liquid
Drums - 50 gal. (minimum)
Tankcars

STORAGE
Bulk storage should be vented, with
tank constructed of 5254 aluminum
alloy. Decomposes rapidly if contam-
inated. Do not use stainless steel
except for very short term storage
(24 hrs) .

APPROX. 1979 COST
$0.16-$0.32/lb.


USES
Sulfide destruction, corrosion control,
control of bulking, supplemental D.O.

COMMERCIAL STRENGTH
35%, 50%, 70%

FEEDERS
Solution
Diaphragm or plunger pump (Fig. 13)

SAFETY CONSIDERATIONS
Prevent contact with most metals and
their salts, alcohols, acetone, organic
materials, aniline, nitrome thane,
flammable liquids, and combustible
materials. Dilute spills with water.

HANDLING MATERIALS
Polyethylene plastic, aluminum.

MAJOR MANUFACTURERS
Ashland Chemical Co., P.O. Box 2219, Columbus, Ohio 43218
FMC Corp., Industrial Chemical Div. , 2000 Market St., Philadelphia, PA 19103
       A-22

-------






w




















TRADE NAMES
( See calcium hydroxide and calcium
oxide)

: 	 ' 	

AVAILABLE FORMS






STORAGE





APPROX. 1979 COST


HANDLING MATERIALS


MAJOR MANUFACTURERS

t
\ - • -


























Sr-2
USES




PnMMPDPIAl CTDC'M/2TU
irwiviivic.rtvsiMi_ o i rvdixu in , ....


FEEDERS





SAFETY CONSIDERATIONS










3
V I




























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MAGNESIUM HYDROXIDE
TRADE NAMES
Magnesium hydroxide


AVAII ARI F POPUQ
MVMIl_HDl_C rV/r\MO

Wooden barrel or drums, glass bottles,
carboys






STORAGE
Absorbs CC>2 in presence of t^O




APPROX. 1979 COST
$0.54-$0.58/lb.

HANDLING MATERIALS
Steel, rubber, iron, Penton, Hypalon

MAJOR MANUFACTURERS
Basic Chemicals, 845 Hanna Bldg. , Clevc



























;la
USES
Acid neutralization



S^f^MMPDfM Al OTmtKI/^TU
v/UMMtKt/IAL STRENGTH
Not applicable

FEEDERS
Gravimetric - L-I-W, belt (Fig. 10,11)

volumetric - helix (Fig. 9)
Slurry — diaphragm pump (Fig. 13)



SAFETY CONSIDERATIONS


No significant hazards






nd, OH 44115
       A-24

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                                 METHANOL
TRADE  NAMES
 Methanol
AVAILABLE FORMS
 Tank Trucks
 Tank cars
 Drums
 Bbls.
" Cans
STORAGE
 Usually  stored as received or in
 conventional fuel tanks.
APPROX. 1979  COST
  $0.56 - $0.63/gal.
USES
Denitrification
                                        COMMERCIAL STRENGTH
99.9% CH3 OH
                                        FEEDERS
                                        Solution feed only
                                        SAFETY CONSIDERATIONS
Vapors and liquid toxic and flammable.
Skin irritant.   Liquid is colorless,
and noncorrpsive except to aluminum
and lead.  Poisonous.
 HANDLING MATERIALS
 Steel
MAJOR  MANUFACTURERS
 E.I.  du Pont de Nemours & Co.,  Beaumont, Tx; Orange, Tx.
 Monsanto Co., Texas City, Tx.;  plus others
 Hercules,  Inc., Plaquemine,  La.
 Air Products & Chemicals, Inc.,  Pensacola, Fla.
 Tenneco Inc., Houston, Tx.
                                    A-25

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                              OXYGEN  (LIQUID)
TRADE NAMES
 Oxygen
AVAILABLE FORMS
 Cylinders
 Tank cars
 Gas bottles
 Can also be  generated on-site.
STORAGE
 Cylinders or spheres of double-walled
 construction,  outer shell of carbon
 steel, inner pressure vessel of
 aluminum, SS,  high nickel steel.
APPROX. 1979  COST
 $35-$40/ton
USES
Odor control, oxidizing agent,
ammonia and BOD removal
                                        COMMERCIAL STRENGTH
99.0-99.99%
                                        FEEDERS
                                         Liquid is vaporized and fed as a gas.
                                        SAFETY CONSIDERATIONS
 Colorless, odorless, tasteless  gas.
 Hazardous in contact with oxidizable
 materials.  Do not smoke near any
 oxygen source.
HANDLING MATERIALS
 Cast iron, stainless  steel, bronze, monel
MAJOR  MANUFACTURERS
Air Product & Chemicals,  Inc., Box 538, Allentown, PA  18105
Air Co. Inc., Albany,  NY; Huron, Ohio; New Orleans, La;  Richmond, Cal;
              Vancouver, Wash; plus others.
Chemetron Corp., Bartonville, 111; Chattanooga, Tenn; Richmond, Va;
              Oklahoma City, Okla; plus others.
Union Carbide Corp.,  Cape Kennedy, Fla.; E. Chicago, Ind.;  Fontana, Calif.;
              Huntsville, Ala.; Kansas City, Mo.; Keasbey,  NJ; plus others.
                                    A-26

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                                   OZONE
TRADE NAMES
Ozone
USES
Taste and odor control, disinfection,
oxidizing agent
AVAILABLE FORMS
Generated on-site by electrical
discharge through dry air
                                        COMMERCIAL STRENGTH
  1-2%
STORAGE
None,
Generated on-site
                                        FEEDERS
                                        Ozonator (Fig,  17)
 APPROX. 1979  COST
Generated on-site
                                        SAFETY CONSIDERATIONS
 Toxic - do not breathe,  explosive; fire
 hazard; keep from oil or readily
 combustible materials
 HANDLING MATERIALS
  Glass, 316SS,  ceramic, aluminum,  Teflon
 MAJOR MANUFACTURERS
  Purification Sciences Inc., P.O.  Box 311, Geneva, NY  14456
                                    A-27

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                                  POLYMER
TRADE NAMES
 Cat-floe, Drewfloc, Hereofloc,
 Aquafloc, Superfloc, Magnifloc,
 Purifloc
USES
Coagulant, filter aid,  separates  oily
wastes, removes SS, sludge condition-
ing, sludge dewatering  aid	
AVAILABLE FORMS
Available in many container  and
package sizes — check with
manufacturer.
                                         COMMERCIAL STRENGTH
Check with manufacturer.
STORAGE
 Store in-dry, cool, low humidity area,
Use bags in proper rotation.   Store
solutions 1 to 3 days or less to
prevent deterioration.
                                         FEEDERS
                                         Dry - See Figures 19 and 20

                                         Solution - metering pump,  rotodip
 APPROX. 8979  COST
$0.60-$2.00/lb.
                                         SAFETY CONSIDERATIONS
Polymer spills are slippery,  clean up
promptly.  Polymers are generally low
in toxicity and are nonirritating.
Check with manufacturer for other
safety information.
 HANDLING  MATERIALS
Depends on polymer type;  however, 316SS,  plastics  generally are acceptable.
 MAJOR MANUFACTURERS
 Calgon  Corp., P.O. Box 1346, Pittsburgh, PA  15230
 Petrolite Corp., Tretolite Div., 369 Marshall Ave.,  St. Louis,MO  63119
 American Cyanamid, Wayne, NJ 07470
 Hercules Inc., Industrial Systems Dept., Wilmington,  DE   19899
 Philadelphia Quarts Systems Co., Inc., P.O. Box 840,  Valley Forge, PA  19482
 Rohm &  Haas Co., Independence Mall West, Philadelphia, PA 19105
 Drew Chemical Corp., 701 Jefferson Rd., Parsippany,  NJ  07054
 Dow- Chemical Co., Midland, MD 48640
 Zimmlte Corp., 810 Sharon Dr., Cleveland, OH  44145
 Garratt-Callahan Co., Ill Rollins Rd., Millbrae,  CA   94030
 Dearborn Chemical Div., Chemed Corp., 300 Genessee St., Lake Zurich, IL  60047
                                     A-28

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                        POTASS IWERHANGANATE
TRADE NAMES
Cairox,  purple salt
USES
Taste and odor control, removes Fe, Mn,
and Phenol,  source of oxygen
 AVAILABLE FORMS
USP
  Steel Kegs  -  25, 110, 125-Ibs
Tech
  Steel drums  -  25, 110, 600 Ibs
                                        COMMERCIAL STRENGTH
Tech - 97% minimum
Reagent - 99% minimum
 STORAGE
Can cake in high humidity, strong
oxidant
                                        FEEDERS
                                         Gravimetric - L-I-W
                                         Volumetric - helix (Fig.  9)
                                         Solution - diaphragm or  plunger pump
   (Fig, 13)
 APPROX. 1979  COST
 $1.29-$1.66/lb
                                         SAFETY CONSIDERATIONS
 Toxic, keep from organics,  glycerine,
 ethylene glycol, benzaldehyde,  and
 sulfuric acid
 HANDLING MATERIALS
  Steel,  iron, PVC, 316SS, synthetic resins, Hypalon,  Penton, Lucite, rubber
 MAJOR MANUFACTURERS
  Ashland Chemical Co., P.O. Box 2219,  Columbus, Ohio  43216
  Carus Chemical  Co.,  1500 8th St.,  La  Salle, IL  61301
  International Chemicals, Inc. 209  W.  Central St., Natick, MA 01760
                                      A-29
                (J

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SODA ASH
TRADE NAMES
See sodium carbonate

AVAILABLE FORMS


STORAGE


APPROX. 1979 COST



USES


COMMERCIAL STRENGTH


FEEDERS


SAFETY CONSIDERATIONS


HANDLING MATERIALS


MAJOR MANUFACTURERS

   A-30

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                            SODIUM ALUMINATE
TRADE NAMES
Soda alum
AVAILABLE FORMS
Dry
  Bags - (ground) - 50,  iCiO,  150  Ib.

Liquid
  Drums - 380. Ib. ( 30 gaL)
  Bulk .- tank car, tank truck
 STORAGE
Dry_ - Store as received for  6 month
  maximum at 60-90ฐF.   Deteriorates on
  exposure to atmosphere.  Hopper
  agitation may be required.
Liquid - Store as received for  2-3
  months maximum.    r
 APPROX.  1979 COST
USES
Coagulation,  phosphorus removal
                                         COMMERCIAL STRENGTH
Dry - 41-46% Al2C-3
Liquid - 4.9 - 26.7% A1203
FEEDERS
 Gravimetric - belt (Fig. 10,11),  L-I-W
 Volumetric - helix (Fig. 9),
             universal  (Fig. 7)
 Solution - rotodip, 'diaphragm pump or
           plunger pump (Fig. 13)
SAFETY CONSIDERATIONS
Exotheric heat of solution.  Dust or
solution spray" should not be breathed.
Safety measures similar to caustic  soda,
Avoid contact with eyes, skin and
clothing.
 HANDLING MATERIALS
 Iron, plastic, 316SS, 304SS," Penton,  concrete, Hypalon
 Avoid the use of copper, copper alloys,  rubber, aluminum.
 MAJOR  MANUFACTURERS
 Nalco  Chemical Co., 2901 Butterfield Road,  Oak Brook, IL
 Reynolds  Chemical Co., Bauxite, Arkansas
 Vinings Chemical Co., Vinings, Georgia  -
 Conservation  Chemical Co., Kansas City,  Missouri
                 60521
                                      A-31

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                            SODIUM BICARBONATE
TRADE NAMES
Baking soda
USES
pH adjustment, acid neutralization
AVAILABLE FORMS
   :s_ - 100  Ib.
Drums - 25  Ib. kegs
Bbls - 112,  400 Ib.
Bulk - carloads
                                        COMMERCIAL STRENGTH
99% NaHC03
 STORAGE
Unstable in solution,  (decomposes
into (X>2 & Na2  003)  Decomposes at
100ฐF
                                        FEEDERS
                                        Gravimetric - belt  (Fig. 10,11), L-I-W
                                        Volumetric - helix  (Fig. 9)
Solution - rotodip, diaphragm pump
           (Fig.  13
 APPROX.  1979  COST
    $11 - $12/100 Ib.
                                        SAFETY CONSIDERATIONS
                                          No significant hazards
 HANDLING  MATERIALS
Iron, steel, rubber,  saran, Hypalon, Tyril
 MAJOR MANUFACTURERS
 Church & Dwight Co.,  Inc., Two Pennsylvania Plaza, New York, New York  10001
 BASF Wyandotte Corp.,  Wyandotte, Michigan 48192
                                    A-32

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                            SODIUM BISULFITE
TRADE NAMES
Sodium metabifulfite, sodium
pyrosulfite, ABS   . ..     .   -
USES
Dechlorination,  reducing  agent in
chromium treatment,  pH control,
;bacteriocide
AVAILABLE FORMS
Bags - 100 Ib.
Drums - 100,  400 Ib.
                                         COMMERCIAL STRENGTH
93-99% Na2S205
62-65.8% S02
 STORAGE
 Store cool and dry in tight container
 (up  to 6 mo.), vent solution tanks
 (storage difficult)
                                         FEEDERS
                                         Gravimetric - L-I-W
Volumetric - helix (Fig. 9), universal
  -(Fig. 7)
 Solution - rotpdip, plunger or
  diaphragm pump (Fig. 13)
 APPROX.  1979  COST
   $16 - $18/100  Ib.
                                         SAFETY CONSIDERATIONS
 Irritating to eyes, skin and
 respiratory, system.  Use protective
 clothing and devices.'
 HANDLING  MATERIALS
Ceramic, chrome,  glass,  lead, 316SS, nickel, rubber,  PVC,  Pen ton, Tyril,
Hypalon, synthetic resin                            >:...-
 MAJOR MANUFACTURERS
Ashland Chemical Co.. ,  P.'O.  Box  2219,. Columbus, Ohio  43216
Virginia Chemicals, Inc.,  3340  W. Norfolk Road, /Portsmouth,  Virginia  23703
Allied Chemical Co.,  P.O.  Box 1139R, Morristown, New Jersey   07960
                                     A-33

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                             SODIUM CARBONATE
 TRADE NAMES
Soda ash
                                         USES
                                         pH adjustment, acid neutralization
AVAILABLE FORMS
Bags - 100 Ib.
Bbls - 100 Ib.
Drums - 25,  100  Ib.
Bulk - carloads, box car, truck
                                         COMMERCIAL STRENGTH
                                         98-99% Na2C03, 58% Na20
 STORAGE
Store in steel bins with dust
collectors.   In bulk  and bagged form,
absorbs C02  and t^O.  "May cake in
storage.
                                         FEEDERS
                                         Gravimetric - L-I-W, belt  (Fig. 10, 11)
                                         Volumetric - helix,  (Fig.  9)
                                         Solution - rotodip,  diaphragm or
                                                    plunger pump  (Fig. 13)
 APPROX.  1979 COST
$57-$87/ton
                                         SAFETY CONSIDERATIONS
                                         Dust and solution  are irritating to
                                         eyes, nose,  lungs  and skin
 HANDLING MATERIALS
Iron, steel, rubber, Hypalon,  Tyril
 MAJOR MANUFACTURERS
 Allied Chemical, P.O. Box 1139R,  Morristown, New Jersey  07960
 Dixie Chemical Co., 3635 W.  Dallas  Street, Houston, Texas  77019
 PPG Industries, Inc., Chemical Div. ,  One Gateway Center, Pittsburgh,  PA
 FMC Corporation, Green River, Wyoming
 Stauffer Chemical, Westend,  California
 Wyandotte  Chemicals Corp., Wyandotte, Michigan  48192
                                                                        15222

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                              SODIUFI  HYDROXIDE
 TRADE NAMES
Caustic soda,  Soda  lye
USES
pH control,  filter  cleaning,
neutralization
Bags - . 100 lb-.    .       :
Drums -  25,  50,  350, 400,700 lb.
Bulk -
 AVAILABLE FORMS
  Truckloads - 1,000  to 4,000 gal.
  Carloads - 8,000,  10,000,  16,000 gaL
                                         COMMERCIAL STRENGTH
Solid - 99.9% NaOH,  74-76% Na20
Solution - 50,  73% NaOH
 STORAGE
Often stored at  20% concentration.
 Crystallizes at 53ฐF for 50%
concentration, and 165ฐF for 73%
solution.
                                         FEEDERS
                                         Solution - plunger  or
                                           diaphragm pump  (Fig. 13), rotodip
 APPROX. 1979  COST
Liquid - $140-$175/ton
Solid - $350/ton
                                         SAFETY CONSIDERATIONS
Caustic poison,  dangerous to handle.
Prevent all body contact  and protect
eyes.
 HANDLING  MATERIALS
Cast iron,  rubber, steel, Penton, PVC, 316SS,  Hypalon, nickel
MAJOR MANUFACTURERS
Allied Chemical  Corp., P.O." Box 1139R, Morristown, New Jersey  07960
Ashland Chemical Co., P.O. Box 2219, Columbus,  Ohio   43216
PPG Industries,  Inc., Chemical Div., One Gateway Center, Pittsburgh, PA  15222
Dow Chemical,  2020 Dow Center, Midland, Michigan 48640
                                    A-35

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                            SODIUM HYPOCHLORITE
TRADE NAMES
Javelle water, chlorine bleach
USES
Disinfection,  slime control, odor
control,  cyanide distribution
 AVAILABLE FORMS
 iarboys - 5,  13 gal.
Drums - 30 gal.
Bulk - 1,300,  1,800, 2,000 gal tank
  trucks
                                        COMMERCIAL STRENGTH
12-15% Available  Clo
 STORAGE
Store in cool place, away from light
and vent containers at intervals.
Can be stored about 60 days.
                                        FEEDERS
                                         Solution - diaphragm pump  (Fig. 13 )
                                           rotodip
 APPROX. 1979 COST
  $0.40 - $0.90/gal
   depending on quantity
                                         SAFETY CONSIDERATIONS
 Corrosive.  Avoid eye -and skin contact;
 use protective clothing and devices.
 HANDLING MATERIALS
 Rubber, ceramic, glass,  Tyril, saran, PVC, vinyl,  Hypalon, plastic
 MAJOR  MANUFACTURERS
 Brenco  Corp., 704 N. First Street, St. Louis, Missouri  63102
 Ashland Chemical Co., P.O. Box 2219, Columbus, Ohio  43216
 Dixie Chemical Co., 3635 W. Dallas Street, Houston, Texas   77019
                                     A-36

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SODIUM METABISULFITE
TRADE NAMES
See Sodium Bisulfite
-

A\/AII A Qt IT ftf*\mAC* " "'
AVAILABLE FORMS






STORAGE



... _ t, . .
.™ ...... , ,„.. . : _ ......
APPROX. 1979 COST


HANDLING MATERIALS

,,.,,.
MAJOR MANUFACTURERS





























USES


•••••> •-.. - -• - * -. — .-, :,'.,,.. . _ .. .; ... .--......

PnMMtTD^IAI C-TDCTKI /2 TLJ
v/UmMtK ulAL OIKcNuIrl


FEEDERS



-

SAFETY CONSIDERATIONS










" ' 	 ' ' *
         A-37

-------
SODIUM SULFITE
TRADE NAMES
Sulfite

AVAILABLE FORMS
Bags, Bbls, Drums, Kegs

STORAGE
Store as received in cool, dry,
well-ventilated area

APPROX. 1979 COST
$0.04-$0.14/lb.


USES
Dechloririation, reducing agent

COMMERCIAL STRENGTH
93-99%

FEEDERS
Solution - plunger or
diaphragm pump (Fig. 13 ), rotodip
/
SAFETY CONSIDERATIONS
Solution gives off S02. Avoid eye
contact and prolonged or repeated
skin contact. Use protective clothing
and devices.

HANDLING MATERIALS
Cast iron, steel, 316SS, PVC, saran, vinyl, synthetic resin, Hypalon, Tyril

MAJOR MANUFACTURERS
Ashland Chemical Co., P.O. Box 2219, Columbus, Ohio 43216
      A-38

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                            SODIUIiTHIOSULFATE
TRADE NAMES
 Hypo,  sodium hyposulfite
AVAILABLE FORMS
Bags,  Bbls, Drums, Kegs
 STORAGE
  Store in cool, dry place
 APPROX.  1979  COST
  $12 - $17/100 lib.
USES
Dechlorination, reducing agent for
                                        COMMERCIAL STRENGTH
                                        98-99%
                                        FEEDERS
                                        Solution - plunger  or
                                          diaphragm pump  (Fig. 13), rotodip
                                        SAFETY CONSIDERATIONS
Avoid eye and skin'contact.
Use dust mask for excessive handling.
 HANDLING  MATERIALS
Cast iron, steel,  stoneware-:
For no contamination:  316SS, PVC,  saran, vinyl, synthetic resin, Hypalon, Tyril.
 MAJOR MANUFACTURERS
Allied Chemical Corporation, N. Claymont, Del; Chicago, 111.,* El Segundo, Calif.
Stauffer Chemical Company, South Gate,  Calif.
Ashland Chemical Company, P.O. Box 2219,  Columbus, Ohio 43216
                                    A-39

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SULFUR DIOXIDE
TRADE NAMES
Sulfur dioxide

AVAILABLE FORMS
Cylinders - 100, 150, 200 Ib,
Bulk - tanks

STORAGE
Pressure cylinders

APPROX. 1979 COST
$168 - $210/ton


USES
Dechlorination, filter cleaning,
Cr+6 reduction, pH control,
bacteriocide

COMMERCIAL STRENGTH
100% S02

FEEDERS
Gas - Rotameter , S02 feeder


SAFETY CONSIDERATIONS
Colorless, suffocating odor, corrosive,
-poisonous

HANDLING MATERIALS
Glass, PVC, ceramic,
Penton, Viton, Hypalon

MAJOR MANUFACTURERS
Cities Service Co.,
Virginia Chemicals,
3445 Peachtree Road, Atlanta, Georgia 30326
Inc., 3340 W. Norfolk Road, Portsmouth, Virginia 23703
     A~40

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SULFURIC ACID
TRADE NAMES
Vitriol, oil of vitriol

-
AVAILABLE FORMS rซ
Bottles . " ':v- 	 " :
Carboys - 5,: 13 gal.
Drums - 55,110 gal .
Bulk - tankcars, trucks

'•
s ;...*-" "

STORAGE
Very corrosive, store dry. and cool in
tight containers
a : : ::.:•• 	 ' ' •. '"
APPROX. 1979 COST
$30 - $61/ton
depending on quantity and strength.


USES
pH adjustment, neutralize alkaline
wastes

COMMERCIAL STRENGTH
66ฐBe - 93.2% H2S04
60ฐBe - 77.7% H7SOA
50ฐBe - 62.2% H0SO/.


FEEDERS
Liquid - plunger pr
diaphragm pump (Fig t 13^, rotodip

SAFETY CONSIDERATIONS
Always add acid to water, never add
water to acid. Avoid , contact with
potassium chlorate, potassium
perchlorate, potassium permanganate, &
other light metals: sodium & lithium

HANDLING MATERIALS
Concentrated - iron, steel, PVC, Penton, Viton
Dilute - Glass, lead, porcelain, rubber


MAJOR MANUFACTURERS
Allied Chemical Corp., P.O. Box 1139R, Morristown New Jersey 07960
Cities Services Co., 3445 Peachtree Road, Atlanta, Georgia 30302
American Cyanamid Co., Hamilton, Ohio; Joliet, Ill.j Kalamazoo, Mi; Savannah, Ga;
plus others
Bethlehem Steel Corp., Sparrows Pt., Md.
E.I. du Pont Nemours & Co. , Burnside, La; Newport, Ind; Richmond, Va; Wurtland,
Ky; Linden, NJ; plus others
Monsanto Co., El Dorado, Ark; Avon. Calif; Everett, Mass.
Rohm & Haas Company, Philadelphia, Pa; Deer Park, Tx.
      A—41 *   U. S. GOVERNMENT, PRINTING OFFICE - 1981 - 777-000/1108 Reg. 8

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                                                                       Postage and
                                                                       Fees paid
                                                                       Environmental
                                                                       Protection
                                                                       Agency
                                                                       EPA 335
                                                                                     Fourth-Class
United States
Environmental Protection
Agency
Washington DC 20460
Official Business
Penalty for Private Use $300

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