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Two detergent zeolites, Doucil-P and Doucil-A24, were tested for their weighting effect in batch tests and on a nitrogen removal activated sludge process. The batch tests with a long contact time revealed a negative effect of zeolite on sludge filterability. In continuous pilot tests, the zeolite accumulated in sludge causing an increase in sludge suspended solids of up to 25 to 30%. This accumulation...
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