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- W2085800520 abstract "Excreta from diary- and fattening-cattle were treated in stirred-tank anaerobic digesters. The VFA contents of the slurries varied considerably with time and type of slurry, and more consistent values relating biogas productions to RT and solids were obtained by calculating gas production from solids alone. For whole dairy-cattle slurries, digestion at 35°C was maximal at 20 or more days RT with 170 litres of biogas (58% CH4) per kilogram of TS fed (on average equivalent to 210 litres including gas from VFA in the slurry), with 32% degradation of TS in a slurry of 5–7·5% TS, and 82% reduction in BOD. At 25°C gas production was 138 litres per kilogram of TS fed, from solids alone, at 20 days RT. For dairy-cattle wastes with the large particles removed by passing the slurry through a 3 mm screen, the gas production (including that from VFA in the slurry) was 280 litres per kilogram of TS fed at RT greater than 11 days, with 35% degradation of TS in a slurry of 3·7% TS content. Reduction in BOD was 72% in 11 days RT to give an output of 2900 mg litre−1. Maximum gas production from fattening-cattle waste was s289 litres per kilogram of TS fed (including gas from VFA) at 20 or more days RT. Average methane content of the gas was 53%. The minimum output BOD was 2500 mg litre−1 at 22 days RT. The ammonia contents of the slurries used as feedstocks varied considerably and equations were worked out showing the ammonia concentrations, and relations to solids, needed for optimum digestion of solids and the concentrations causing inhibition of digestion. Some counts of cellulolytic and methanogenic bacteria were done at different retention times." @default.
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- W2085800520 date "1987-01-01" @default.
- W2085800520 modified "2023-09-25" @default.
- W2085800520 title "Stirred-tank, mesophilic, anaerobic digestion of fattening-cattle wastes and of whole and separated dairy-cattle wastes" @default.
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- W2085800520 doi "https://doi.org/10.1016/0269-7483(87)90083-8" @default.
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