Study on degradability and reduction of activated sludge treated ultrasonically
- Received Date: 16/10/2009
- Accepted Date: 25/07/2009
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Key words:
- ultrasonication /
- sludge reduction /
- degradability /
- effluent quality
Abstract: This study investigated the effect of return sludge treated ultrasonically on sludge degradability and reduction by altering the processing rates to understand better the degradability and reduction efficiency of sludge in SBR system. The results indicated that ultrasonication can facilitate effectively sludge reduction and stability. The observed yields and VSS/SS of the sludge at the processing rate of 30% decreased by 28% and 5.1%, respectively, as compared to that of the untreated sludge. However, ultrasonication deteriorated slightly effluent quality. When the processing rate was 30% and 40%, the effluent COD removal efficiencies decreased by 9.5% and 12.3%,respectively， and the effluent turbidity slightly increased.
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