Previous attempts at simulating the floc blanket clarification process have failed to predict adequately the performance of ‘real’ tanks on water treatment works over a range of treatment conditions. In this paper, a mathematical model of the floc blanket clarification process is presented. This model has been used to simulate the performance of a flat-bottomed clarifier operating on a full-scale water treatment works. The model predictions have been compared with data obtained from the treatment works, and the model has been shown to perform well. The model has then been used to simulate the effects of changes in the operating conditions of the clarifier on the concentration of the blanket in the clarifier and the quality of the treated water. The importance and potential uses of a model of the process at a treatment works are discussed.

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