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Abstract In order to effectively control the sludge filamentous bulking in A2O-BAF denitrifying phosphorus removal process when treating domestic wastewater, the effects of sludge load and temperature on sludge filamentous bulking were investigated. The results had shown that the problem of slight sludge filamentous bulking existed when the sludge load was less than 0.30kgCOD/(kgMLSS·d). Serious sludge filamentous bulking got easily happened when the sludge load was higher than 0.55kgCOD/(kgMLSS·d), and sludge filamentous bulking was controlled effectively by changing sludge load. The sludge filamentous bulking also occurred when the temperature was decreased in winter, but the settling ability of activated sludge got recovered after increasing the temperature to original level, and the sludge filamentous bulking was also controlled effectively.
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Received: 27 March 2015
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