Factors affecting dispersion of activated sludge flocs

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The parameters of the power-law and log-normal floc size distribution models were correlated with the values of process operation factors for five, full-scale conventional activated sludge wastewater plants. Stepwise regression was applied to investigate the combined effects of these factors and the interaction of selected factors. Factors affecting the frequency of occurrence of primary particles were examined by logistic regression and stepwise regression. It was found that the process operation factors affect the floc size distribution in a complex way, but sludge loading was the most important and statistically significant factor influencing the frequency of occurrence of primary particles (<2 μm) in mixed liquor.

Keywords: activated sludge; correlation statistics; floc size; models; primary particles; process operation factors

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/WER.65.3.10

Publication date: May 1, 1993

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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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