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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Case Study 4.5: CONTACTS Address: Telephone: Foster Brothers Farm Robert L. Foster RD #3, Route 166 Middlebury, VT 05753 802.388.6234 Don Brumfield Vermont Natural Ag Products 559 Lower Foote Street Middlebury, VT 05753 802.388.0156 GENERAL SYSTEM INFORMATION Farm Type: Herd Size: System Type: Dimensions: Capacity: Biogas Production: Operational Date: 1998 Status: Project History: Dairy. Maintenance History: 635 total head with manure from 340 milkers used. Plug-flow with XR-5 cover material. 96 ft x 48 ft x 7 ft. 3 32,250ft (241,000gal). 31 28,000 ft /d reported . However, given current level of electricity 3 production, probably 35,000-40,000 ft /d. 1982. Operational. The project was initiated as a result of concerns regarding manure management and the energy crises of the 1970s. The project was designed to accommodate frozen manure in the winter assembled from push-off areas at the free-stall barns. The digester labor requirement had to complement the labor requirement used in stall scraping and feeding chores. Adequate manure storage and ease of application were both important considerations. The plug-flow design is viewed as having an advantage because uniform temperatures are not required throughout the digester, and the reduction in thermal stress of the bacteria provides a higher yield of 2 biogas. The digester has had 2 manual clean-outs since 1982. Normal maintenance, consisting primarily of engine oil changes every 300- 400 hours, is also done as scheduled. Biogas clean up for removing hydrogen sulfide consists of limestone flakes in a plastic barrel. 4-17PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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