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Investigation into excess activated sludge accumulation at low temperatures

, : Investigation into excess activated sludge accumulation at low temperatures. Water Research Oxford 28(3): 501-509

The effect of low-temperature (8 and 20 degrees C) operation of the activated sludge process on the volatile suspended solids yield was investigated at laboratory scale using two parallel 4-litre sequencing batch reactors operating at a sludge retention time of ~ 10 d and a hydraulic retention time of ~ 1.25 d. The observed yield of volatile suspended solids increased at lower temperatures for two levels of influent suspended solids (~ 15 and 70 mg/litre).

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