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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Lessons Learned: sulfide in the biogas is not scrubbed before fueling the engine/generator, which results in more frequent oil changes than might be conducted at a facility which removes hydrogen sulfide before combustion. Engine oil is replaced every 1,100 operating hours, about once a month. The value has been unquestionable when measured in terms of energy savings, manure management, and the production of valuable coproducts for use as bedding and fertilizer. If there is a secret to the success of this system, the operators say it is the use of a hard- covered, well-built digester tank. Even though the original system was installed with a minimum of trouble-prone “bells and whistles,” the operators have also spent time removing equipment that was found not to be necessary for operational success. Operators would also build a separate preheating tank to allow for grit settling before introducing the manure to the digester. Included in capital cost. $150,000. $6,000-$7,000, including the annualized cost of engine replacement. Electricity production with thermal reclaim used for digester heating. 85-kW model 3306 Caterpillar modified by Perennial Energy. The current engine has been operating for more than 3 years without an overhaul. Previously estimated at 435,000-620,000 kWh. However, with an 85% availability factor, electricity production could be at 630,000- 720,000 kWh. 21 Previously estimated to be $38,500 -$42,000 . However, at the 1998 electric rate of $0.105/kWh, operators estimate the savings to be $48,000. Used for digester heating. Not applicable. Effluent is separated into solid and liquid fractions using a centrifuge. Solids reclaimed at this stage have a consistency like 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: Thermal Savings: End-Uses of Effluent: 4-15PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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