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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Case Study 4.2: Not Publicly Identified GENERAL SYSTEM INFORMATION Farm Type: Herd Size: System Types: Dimensions: Capacity: BiogasProduction: Operational Date: 1998 Status: Project History: Dairy. 3,900 total head with manure from 2,200 milkers used. 2 plug-flow and 2 slurry-based loop. Plug 1: 92 ft x 14 ft x 20 ft with a “V” bottom. Plug2: 92ftx14ftx24ftwithaflatbottom. Loop 1: 14 ft x 68 ft diameter. 3 Plug 1: 25,760 ft (192,000 gal). 3 Plug 2: 30,912 ft (231,000 gal). 3 Loop 1: 50,800 ft (380,000 gal). 31 34,960ft/destimated forPlug1.Operatorestimatesproductionis 33 85 ft /cow/d, suggesting that production is 190,000 ft /d or more. Plug 1: Plug 2: Loop 1: Loop 2: 1979. 1981. 1985. 1998 (in planning). Operational. The farm’s first liquid manure handling system was built in 1961. After installation, methane bubbles forming on the surface triggered an interest in biogas production. The first digester unit was installed as a response to the energy crises of the 1970s; the purpose was to make the farm energy self-sufficient. Plug 1 processed the manure from a 600-cow milking herd and worked with an 8%-10% TS concentration. A chopper pump was installed to reduce crusting. As herd size increased, the second unit was built incorporating the “lessons learned,” including a flat bottom unit design rather than the traditional “V” bottom. Both units exhibited a common problem associated with the plug-flow approach: solids crusting and lower system performance during the winter because of freezing. The third digester design, the loop approach, was implemented as the herd size again increased in the mid-1980s. The simplified loop digester design comparatively reduced construction costs by $40,000. Although changes in farm manure management practices are likely contributing factors, the loop digester helped to eliminate the solids 4-8PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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