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EVALUATING THE IMPACT OF ANOXIC SLUDGE RECYCLE ON NET SLUDGE YIELD

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Environmental engineers and plant owners and operators have expressed interest in minimizing the amount of sludge produced in biological wastewater treatment plants. In one proposed method, part of the return activated sludge stream is held in a side-stream anoxic reactor for retention times ranging from one to thirty days before returning it to the aeration basin. Reported reductions in the amount of sludge production that can be achieved by this process range from 20 to 90%. The authors' study of the oxic-anoxic process has shown that the reduction in waste sludge is largely due to the increased solids retention time associated with the large amount of biomass held in inventory in the anoxic reactor. Observed reductions ranged from 18 to 27% when operating at a 25-d SRT and up to 20% when operating at a 5-d SRT.
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Document Type: Research Article

Publication date: 2004-01-01

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