Abstract
This study deals with evaluation of peak loading effects from storm and snow-melt waters on the operation of a final settling unit. The load variations have been investigated using a full–scale final settling unit for which a dynamic simulation model has been developed. The model simulates profile changes in the sludge blanket caused by load variations. Furthermore, it can be used for detailed investigations into the effects of flow, solids loading, and sludge recycling on the sludge profile and clarifier capacity by varying the settling velocities within the sludge blanket. With help of the model, the dimensioning and design principles of a vertical clarifier can be further improved. In addition, a new in–situ method for the determination of sludge settling velocity has been developed, which can also take into account the influence of sludge blanket thickness on sludge settling velocity.
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