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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Maintenance History: capacity. When first installed, the digester was agitated by forcing trapped biogas through a rotary compressor, which discharged the gas from a jet located 8 ft below the liquid level. Daily maintenance takes 5-10 minutes. The procedure involves checking the effluent input and discharge pipes to make sure they are not plugged, and checking to make sure biogas is being flared. Ten years ago, the digester was cleaned to remove built-up solids. The original cast iron input, discharge, and access port pipes were replaced with PVC, because the iron had degraded from scoring at the water level in the digester. Because convective currents produced by the heat exchanger produce enough agitation in the digester to avoid crusting problems, the rotary compressor system is no longer being used. Two additional backup systems--a mechanical agitation system for breaking up severe crusting and an auger extractor to be used in case the slurry becomes gelatinous--have never been needed. Overall, the system has experienced few problems. The only concern is that the amount of biogas produced must be balanced with the digester water flow rate. On-farm AD works and effectively controls odors. The disposal of sludge produced as a result of the digestion process does not require taking land out of cultivation. The biogas produced can be a valuable product, but only those who are willing to commit to consistent monitoring should build a digester. Included in capital cost. $20,000 for materials, plus labor. About 2 years were spent in self- education, locating equipment, and construction. $2,500 for natural gas. Flared. Not applicable. Not applicable. Not applicable. Not applicable. Lessons Learned: COSTING INFORMATION Siting Cost: Capital Cost: Annual O&M Cost: End-Use of Biogas: Prime Mover Type: ANNUAL SAVINGS Electricity Production: Electricity Savings: Thermal Production: 4-6PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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