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Development of refined clarifier operating diagrams using an updated settling characteristics database

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An analysis of five sludge-settling characteristics data sets is presented, representing data from 51 separate suspended growth biological wastewater treatment processes and including 214 separate runs and over 1 500 individual data points. The results indicate that the data can be characterized using a single relationship between the initial sludge settling velocity (V i), the initial sludge concentration (C i), and the sludge volume index (SVI). The predictive capability of this relationship is independently verified. These results suggest that this single relationship can be used to accurately characterize the settling characteristics of an activated sludge based only on the measured SVI. A comparison of alternate sludge-settling indexes indicates that the predictive capability of the relationship can be further improved by use of the stirred SVI3.5 analysis rather than the SVI. More data are required to refine relationships developed based on the SSVI3.5 and the diluted SVI. Secondary clarifier-operating diagrams based on the developed relationships are presented.


Document Type: Research Article


Publication date: 1995-01-01

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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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