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Methane Recovery from Chicken Manure Digestion
C. William Savery and Daniel C. Cruzan
Journal (Water Pollution Control Federation)
Vol. 44, No. 12 (Dec., 1972), pp. 2349-2354
Published by: Water Environment Federation
Stable URL: http://www.jstor.org/stable/25037689
Page Count: 6
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The large concentration of manure produced by intensive livestock production units provides an opportunity for producing the valuable by-product of methane. To provide preliminary design data for a farm total energy system fueled by bacteria-produced methane, an experimental anaerobic digester of 35-l capacity was built, and daily gas production rates and compositions were determined for loadings of fresh chicken manure. Batch reactor operation in the thermophylic bacteria range at 51°C produced 130 l of gas (69 percent methane and 31 percent carbon dioxide)/kg of wet manure reacted. Attempts at operating the anaerobic digester at 51°C in a continuous-flow, well-stirred mode with hydraulic retention times of 4, 5, and 6.7 days resulted in retarded digester operation. The experimental digester was operated as a batch process in the mesophilic range of 29°C; the yield of methane was comparable, but the production rate was lower than that of the 51°C batch.
Journal (Water Pollution Control Federation) © 1972 Water Environment Federation