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Effect of Anaerobic and Anoxic Selectors on Oxygen Transfer in Wastewater

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Pilot- and full-scale systems were operated with and without anaerobic and anoxic selectors to determine the effect of selectors on fine pore diffuser oxygen-transfer efficiency as reflected by the alpha correction factor. All systems operated at a mean cell residence time between 7.0 and 10.0 days and were fully nitrifying. Process water oxygen-transfer performance was monitored using offgas tests. Average measured alpha (α) factors in the pilot plant ranged from 0.33 to 0.53 without selectors in operation and from 0.39 to 0.51 with selectors in operation. Average measured α factors in the full-scale plant ranged from 0.29 to 0.79 without selectors in operation and from 0.28 to 0.68 with selectors in operation. Both pilot- and full-scale tests indicated that selectors had little influence on oxygen-transfer efficiency as reflected by α when compared with systems that were fully nitrifying.
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Document Type: Research Article

Publication date: 01 January 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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