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Theoretical aspects of bulking in activated sludge

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Percolation theory was applied in a theoretical analysis of bulking of activated sludge caused by filamentous microorganisms. Dimensionless filament concentration was defined as L = TEFLv · d 2 (where TEFLv = total extended filament length per unit volume, d = length of an individual filament). For L less than a critical value L*, sludge settling is not affected. For L > L* sludge settling is impaired. The critical value L* was theoretically estimated at 0.90 and compared with experimental data reported in the literature. Settling and compression of sludge in a sludge volume index test was analyzed. Elasticity modulus of compressed sludge was related to solids concentration.

Keywords: bulking; filamentous microorganisms; percolation theory; sludge compression; sludge settling; sludge volume index

Document Type: Research Article


Publication date: 1993-05-01

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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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