EFFECTS OF ACID OR ALKALINE PRETREATMENT ON WASTE ACT. .VATED SLUDGEC.P. CHU, D.J. LEE, BEN-VEN CHANG AND G.S. LIAOAbstract This study experimentally investigated the change in mirobial density level, the amount of organics that could be hydrolyzed, and sludge dewaterability of a waste activated sludge subject to acid or alkaline pretreatments. Responses of sludge were different under acid or basic environment, which were discussed separately.
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