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Operating a full-scale poultry manure anaerobic digester
Institution:2. Department of Animal Science, Division of Agriculture, University of Arkansas, Fayetteville 72701;3. Livestock and Forestry Research Station, Division of Agriculture, University of Arkansas, Batesville 72501;4. Huvepharma Inc., Peachtree City, GA 30269;2. Division of Agriculture, Cooperative Extension Service. University of Arkansas, Little Rock 72204;3. Division of Agriculture, Livestock and Forestry Research Center, University of Arkansas, Batesville 772701;4. Furst-McNess Co, Freeport, IL 61032
Abstract:A full-scale, completely-mixed digester, with a liquid capacity of 587 m3, was constructed to process the manure from 70 000 caged layers. Biogas from the digester was used as fuel for an engine/generator set. The operating temperature was maintained at 35°C using waste heat from the engine. The digester was operated on a 22–24 day HRT. Digester influent averaged 5·90% TS, 5250 ppm TKN, and 3790 ppm NH3N. Digester effluent averaged 3·11% TS, 5090 ppm TKN, and 4060 ppm NH3N.Sustained operation of the digester was achieved during the period of study (8/83?4/85). During this period biogas production averaged 0·38 m3 kg?1 VS added (0·58 m3 kg?1 VS destroyed). The CH4 content averaged 58·0%. The major operational problem encountered was grit accumulation in the digester. This problem was reduced by settling most of the grit from the manure prior to the digester. Biogas production was reduced when concentrated lagoon-liquid was used as make-up water. Approximately 22% of the electricity produced was required for operating the system.
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