Abstract
Laboratory batch and continuous-flow experiments were conducted at 20 °C on primary treated wastewater using charcoal and kaolin in concentrations between 0 and 5000 mg litre −1 added to activated sludge bioreactors. Results obtained revealed that addition of charcoal or kaolin enhances organic removal and improves sludge settleability. The substrate removal increases with sorbent concentration to an optimum dosage. Kinetic relationships can be approximated by a first-order reaction in which an apparent rate constant describes the overall (biological and sorption) substrate removal. The mechanism of sorbent enhancement of activated sludge treatment is discussed.
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