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Solids separation parameters for secondary clarifiers

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Efficient separation of solids and supernatant is crucial in an activated-sludge system because the performance of the system depends on the return of active biological solids to the biological reactor. For optimization and planning of the process, dynamic models describing the settling process are available. To use these models for simulations, parameters that characterize biomass settling must be known. The one-dimensional model used in this work requires characteristic settling parameters from repeatedly performed batch tests. However, the model, together with its characteristic parameters, applies better to deep circular clarifiers than to rectangular ones. This work describes a new method to find the alternative settling parameters V A and n A , from dynamic measurements in a full-scale rectangular clarifier, to be used for simulations of the same clarifier. Results from simulations of the movement of sludge blanket height in different clarifiers using the parameters V A and n A agreed well with full-scale performance.


Document Type: Research Article


Publication date: 1998-11-01

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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