Abstract
Chemical companies, food industries usually produce wastewaters with high salinity. In consideration of economy, biological methods are preferred to physicochemical methods to remove organic matters. When sequence batching reactors are applied, aeration rate is of great importance to the COD removal efficiency. In this bench scale experiment, the aeration rate of 0.40 m3/m3.min led to sludge disintegration, poor COD removal efficiency and superfluous foam. After sludge conditioner addition, the aeration rate of 0.19 m3/m3.min led to good sludge flocs, satisfactory COD removal efficiency and few foam. It is the oxidizing environment caused by the high dissolved oxygen that harmed the sludge and made it work with low efficiency.
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