K iM(«nv sauDs STAND-ALONE ANAEROBIC DIGESTERS MICHIGAN STATE UNIVERSITY SOUTH CAMPUS ANAEROBIC DIGESTER, EAST LANSING, Ml SYSTEM DESIGN As part of Michigan State University (MSU)'s vision for campus sustainability and its campus energy transition plan, MSU and its partners constructed the South Campus Anaerobic Digester (SCAD). The single-tank complete mixed anaerobic digester will utilize approximately 17,000 tons of organic waste per year as feedstock to produce biogas. The feedstock includes dairy manure from the MSU Dairy Teaching and Research Center; fruit and vegetable waste from a local food processor; fats, oil and grease from local restaurants; and food waste from campus dining halls and sports/entertainment venues. The feedstock is pumped into a central mix tank where the dairy manure and the other materials will be homogenized. The blended material is then pumped through a heat exchanger before going into the digester, which is an aboveground steel tank that can hold more than 450,000 gallons of liquid. The tank is kept air-tight with a flexible membrane, which seals in the biogas. Feedstocks Processed Dairy manure, fruit and vegetable waste; fats, oils and grease; and campus food waste Digester Type Complete Mix Biogas Generation: 170,000 ft/day Biogas Use: Cogeneration Biogas Generating Capacity: 2.8 million kWh per year Population Feeding Digester: 180 milking head & 180 heifers PROJECT BENEFITS Michigan State University's digester project includes the following benefits: - Renewable energy production - Emissions reduction - Odor control - Landfill and wastewater diversion - Enhanced fertilizer Electricity generated from the biogas will be used to power 8 to 10 south campus buildings. The remaining digestate, a mix of solids and liquids wiil be pumped into a solid-liquid separator. Separated solids will be composted and the digestate will be land applied seasonally as carbon-rich fertilizer. Feedstocks Processed Manure, fruit and vegetable waste; fats, oils and grease; and campus food waste Digester Type Complete Mix Biogas Generation: 170,000 ft/day Biogas Use: Cogeneration Biogas Generating Capacity: 2.8 million kWh per year Population Feeding Digester: 180 milking head & 180 hpifprs Updated on May 12, 2016 ------- |