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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Case Study 4.6: CONTACTS Address: Telephone: Langerwerf Dairy Leo and Linda Langerwerf 1251 Durham-Dayton Highway Durham, CA 95938 530.893.3131 GENERAL SYSTEM INFORMATION Farm Type: Herd Size: System Type: Dimensions: Capacity: Biogas Production: Operational Date: 1998 Status: Project History: Dairy. Digester originally sized for 600 milkers. The 1998 herd size is 700 head with manure from 340 milkers used. Will be expanding the milking herd to 400 milkers in 1999. Plug-flow with hypalon cover material. 125 ft x 25 ft x 14 ft. 3 43,750ft (327,000gal). 31 30,000 ft /d design (60% methane content). 3 15,000-20,000 ft /d in 1998. 1982. Operational. The project was initiated to take advantage of the California Department of Food and Agriculture’s low-interest loan program that was available to dairies for installing anaerobic digesters as an alternative manure management tool. After examining several systems, a plug-flow was selected because the digested solids could be more readily recovered before discharge into a storage pit after scrape collection. This reduced some of the problems and expenses associated with using spreader trucks, which previously pumped materials from the storage pit for land application. The project was slowed in its initial start up because of a lack of labor and knowledge of system operation. The digester is housed in an innovative low-cost greenhouse, which protects it from wind damage and rainwater collection. However, after 16 years of continuous running, key components of the system are at the end of their functional lives. 4-20PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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