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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Maintenance History: Lessons Learned: crusting problem. Because of increases in the herd size, a second loop digester is scheduled to be added in summer 1998. Daily maintenance is a 15-minute check of engine oil and a walk- through inspection. Engine oil is changed regularly every 400 hours because there is no scrubbing system to remove hydrogen sulfides from the biogas. Engine oil is monitored for signs of engine failure. Engines are overhauled as necessary, especially engine valve guides. There is an annual manual clean-out of Plug 1 to remove lime and gritty solids. The decision would be to go straight to a loop digester design because of reduced capital and O&M costs. The loop digester has less outside surface area than a plug-flow digester, so parasitic heating requirements are minimized. Also, the loop digester has heat pipes installed on a center wall, so the convective currents are greater than those in a plug-flow digester. As a result, there is no need to agitate the loop digester, and the crusting problem associated with the plug-flow digester is reduced. Not available. 1 $180,000 for the first plug-flow system installed in 1979 . Modifications to the engine/generator and effluent handling system cost an additional $80,000. Operator estimates the turnkey capital cost required to build a new loop system that would replace the 3 units installed as of 1995 would be $250,000. Not available. Electricity with thermal reclaim used for heating digester and a nearby home. Original was a Detroit Diesel system that was replaced after 5,500 hours of operation with 2 150-kW model 342 Caterpillar LP gas engine/generators. These engines operate with gold-tipped spark plugs. The engine ignition is advanced by 21 degrees, and the engines have modified carburetors to account for the lower energy content of biogas. Two additional Caterpillar engines are installed. Total biogas installed capacity has a combined rating of 600-kW. There is also a 150-kW diesel engine/generator on standby. COSTING INFORMATION Siting Cost: Capital Cost: Annual O&M Cost: End-Use of Biogas: Prime Mover Type: 4-9PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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