Acceptability of Thermal Relief Vents on Hazardous Waste Incinerators


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Wasnngton OC 204b0
&EPA OSWER Directive Initiation Request I 9488.00
- 3,
Or’qin.tor Infovmai,
Name of Contact Person —
Robin Anderson
Mail Cod. — Branch I Tele rion ?ium sr
WH-563 1382-4498
Lead Oflice 0 c i
0 OERR 0 OWPE
0 5W 0 AA.OSWER
Approvid
Review
Signature of Office O’SCtOr Oat.
Title
Acceptability of Thermal Relief Vents on Hazardous Waste Incinerators
Summary of Dirsct. e
This memo is in response to a request regarding the
acceptability of thermal relief vents (dump stacks) on
hazardous waste incinerators. . ‘Although dump stacks have been
allowed on incinerators to protect the air pollution control
system during the failure of the ancillary power and water
cooling systems, their use needs to be severely limited Since
direct venting of stack emissions during system failure is expected
to result in violationsof the Subpart 0 of Part 264 performance
standards. The operation of the dump stack needs to be limited
either through the use of back—up power and water cooling or
through the use of use of emission control on the dump stack.
In all cases the permit should limit the frequency of dump stack
use.
Key Words:
mci neration
Typ. of Drr .evvs IM.rwaL Policy cf.ve. Announc.meni.
Policy
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This Re .j t Mets OSWER Directives Systoni Format
Sgrature of Lead Office Directives Officer
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5.griature of OSWER Directives Officer

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OSW Directive Number 9488.00 - 3
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
WASHINGTON. D.C. 20460

JJ3n,
OFFICE OF
SOLID WASTE AND EMERGENCY RESPONSE
MEMORANDUM
SUBJECT: AcceptabilitY of Thermal Relief VentS on
Hazardous Waste Incinerators
£
FROM: Bruce Weddle, Director
Permits and State Programs Division
TO: James H. s arbrough, Chief
Waste Management DiviSiOn, Region IV
Marcia Williams asked that I respond to your June 20, 1986,
memorandum in-which you reguested guidance on the acceptability
of using a thermal relief vent (dump stack) on a commercial
incinerator seeking a RCRA permit. As was discussed with
Beverly Spagg of your staff on June 26, dump stacks are allowed
on hazardous waste incinerators to protect the air pollution
control system (APCS) during failure of ancillary systems, such
as, power and water cooling systems. However, the use of dump
stacks during operation of the incinerator should be severely
limited since direct venting of stack emissions is expected to
result in violations of the Part 264, Subpart o, performance
standards.
The operation of a dump stack should be limited either
through the use of a back—up power and water cooling system, or
through adding an emiSSiOfl control system (e.g., fume incinerator
and an APCS if particulate or acid emissiOnS pose a risk) on the
dump stack. Also, a condition should be included in the permit
that limits the use of the dump stack. Discussions with
Don Oberacker of the Office of Research and Development, indicate
that back—up power and water systems are in common use in Europe
and Canada to avoid the necessity of venting emissions through
the dump stack. We believe, however, that there may be occasions
(e.g., back—up power system or water cooling system fails) when
emissions must still be vented through the dump stack to avoid
damage to the APCS and their inclusion in the design may be a
reasonable option.

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—2—
The use of dump stacks should be limited via the methods
discussed above or equivalent methods and the permit should
include a limit on the frequency of the dump stack use. The use
of these measures does not preclude the necessity of automatic
waste feed shut off during episodes of primary power or water
coolant failure. Please contact Robin Anderson at FTS—382—4498
if you have questions or comments on this issue.
cc: Susan Bromiri
Ken Shuster
Art Glazer
Robin Anderson
Hazardous Waste Branch Chiefs, Region 1—111 and V—X
Incinerator Permit Writer’s Workgroup

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