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The Effect of Anaerobic Selectors on Nocardioform Organism Growth in Activated Sludge

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Laboratory- and full-scale experiments were conducted to investigate the use of anaerobic selectors for control of nocardioform organisms in activated sludge. The laboratory-scale, anaerobic-selector, activated-sludge system, which exhibited enhanced biological phosphorus removal (EBPR) at a 2.4-day total mean cell retention time (MCRT) with a pH of 6.3, a temperature of 20 °C, and an anaerobic selector hydraulic retention time (HRT) of 50 minutes, controlled nocardioforms to below detectable levels whereas nocardioforms were present in a completely mixed control. The full-scale, anaerobic-selector, activated-sludge system performing EBPR at a 3.5-day average MCRT, average temperature of 20 °C, and anaerobic selector HRT of 17 to 24 minutes reduced nocardioform organism levels below those achieved when the full-scale plant was operated at conditions that did not permit EBPR (i.e., MCRT of 1.7 days and anaerobic selector HRT of less than 19 minutes). In the full-scale plant, the lowest nocardioform organism levels and effluent dissolved orthophosphate concentrations were associated with the highest MCRT tested (4.6 days).
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Document Type: Research Article

Publication date: 01 September 1999

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    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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