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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Maintenance History: Daily O&M requirements are minimal, requiring about 10-15 minutes on average. They follow a consistent data collection protocol to monitor system performance. Parameters include checking condensate, digester and engine temperatures, engine oil levels, engine oil pressure, and recording biogas production. Major system overhauls are scheduled annually; one for the engine, as well as removing built-up solids from the digester. The basic overhaul requires 2-3 days, and the recovery of the digester system might add 3-4 more days. This procedure enables the system to consistently maintain a 95% availability factor. A concrete stave silo digester with a fiberglass roof, and a Fiat TOTEM engine/generator that required a biogas scrubber and gas compressor was initially used. Standard design now consists of a poured epoxy-coated concrete silo, 4 inches of urethane foam, and a special sealant inside the urethane to provide a gas- and liquid- tight interior surface. This allows for higher pressures inside the digester that directly feeds the engine/generator without the need for a compressor. The biogas is no longer scrubbed to remove hydrogen sulfide; instead, frequent oil changes and keeping the engine hot by running it 24 hr/d has become the best method to reduce corrosion. An insulated housing area reduces the frozen manure problem in the winter and allows for greater winter biogas production. The system was converted to separate solids before introducing them into the digester. This results in a 20% volume reduction, making the remaining liquid materials more pumpable. The separation is also believed to reduce solids crusting in the digester. The 1998 focus is on composting the separated solids to produce a value-added animal bedding. The use of composted solids in this fashion has the potential to reduce mastitis. Included in capital cost. $175,000 (about $1,000/cow). Estimated to be $3,650. Electricity with thermal reclaim used for digester and 2 buildings. 18-kW 4-cylinder Mercruiser (GM) marine engine modified by Perennial Energy. At the time of the site visit, the engine had logged more than 15,000 operational hours since its last overhaul. This is far beyond the 8,500 hour operational life usually desired. Lessons Learned: COSTING INFORMATION Siting Cost: Capital Cost: Annual O&M Cost: End-Use of Biogas: Prime Mover Type: 4-12PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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