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- W2083963780 abstract "Phase separation of sludge digestion was investigated using a suspended growth system for the acid phase and a fixed-film system for the methane phase. A thermophilic temperature of 50°C was used in the methane reactor, while a mesophilic temperature of 37°C was maintained in the acid reactor. During the acid-phase stage, the volatile acid concentration and the reduction of volatile solids averaged approximately 2200 mg dm−3 as acetic acid and 13% (w/v), respectively, under a hydraulic retention time of 2 days. These parameters were not significantly affected by the applied solids concentration. Reduction of the retention time in the acid reactor from 2 days to 1 day decreased the methane content (18% versus 28%) and the volatile solids destruction (8% versus 13%), but produced the same amount of volatile acids. The total gas production for 10 days overall retention time was slightly higher than that for conventional single-phase sludge digestion. The significant cost saving in reactor volume and enhanced methane production may offset the increased energy consumption required for maintaining a thermophilic temperature during the methane phase." @default.
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- W2083963780 date "2007-04-24" @default.
- W2083963780 modified "2023-10-16" @default.
- W2083963780 title "Anaerobic sludge digestion using mesophilic-thermophilic phase separation" @default.
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- W2083963780 doi "https://doi.org/10.1002/jctb.280450202" @default.
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