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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK The North Carolina Energy Division and North Carolina State University constructed the first 14 full-scale covered anaerobic lagoon digester on the east coast at the Randleigh Dairy in 1988. The digester processed the manure from 150 dairy cows. The project used funds provided by the Southeast Regional Biomass Energy Program (RBEP), the North Carolina Agricultural Research Service, and the North Carolina Dairy Foundation. The project objective was to educate dairy producers through practical demonstration and outreach about the merits of a low-cost and easily Covered lagoon system at Randleigh Dairy (photo credit: RCM Digesters) maintained digester suitable for use on farms using hydraulic flush manure management systems. The project provided information about the amount of biogas that can be recovered, along with cost information from which the economic merit of the technology can be evaluated. The methane produced in an anaerobic lagoon is captured by placing a floating, impermeable cover over the lagoon. The cover is constructed of an industrial fabric that rests on solid floats laid on the surface of the lagoon. The cover can be placed over the entire lagoon or over the part that produces the most methane. Once the cover is installed, the methane produced under the covered area of the lagoon is trapped. The biogas is harvested using with a collection manifold, such as a long perforated pipe, that is placed under the cover along the sealed edge of the lagoon. Methane is removed by the pull of a slight vacuum on the collection manifold (by connecting a suction blower to the end of the pipe) that draws the collected biogas out from under the cover and on to the end-use application. The cover is held in position with ropes and anchored by a concrete footing along the edge of the lagoon. Where the cover attaches to the edge of the lagoon, an air-tight seal is constructed by placing a sheet of the cover material over the lagoon bank and down several feet into the lagoon, and clamping the cover (with the footing) onto the sealed bank. Seals are formed on the remaining edges with a weighted curtain of material that hangs vertically from the edge of the floating cover into the lagoon. 14 Commerce, Energy Division. Safley, L.M.; Lusk, P. (1990). Low Temperature Anaerobic Digester. Raleigh, NC: Department of 2-9PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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