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Full-scale evaluation of factors affecting the performance of anoxic selectors

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Abstract:

Five full-scale nitrifying activated-sludge systems incorporating anoxic selectors were evaluated. Operating records were reviewed to determine selector performance (filament control) and to identify operating conditions that affected selector performance. Key operating parameters found to influence anoxic selector performance were selector loading, expressed in terms of the selector food-to-microorganism (F:M) ratio, wastewater temperature, and activated-sludge system aerobic solids retention time (SRT). A target selector F:M ratio of 0.7 to 1.2 kg CBOD5 (carbonaceous biochemical oxygen demand)/kg MLSS (mixed liquor suspended solids) · d (lower values at cooler temperatures, higher values at warmer temperatures) and an aerobic SRT of 8 to 12 days were found to produce excellent selector performance. Increasing selector F:M or system aerobic SRT to greater than these ranges was found to result in persistent filamentous bulking.

Keywords: ACTIVATED SLUDGE; ANOXIC; FILAMENTOUS BULKING; FOOD-TO-MICROORGANISM RATIO; NITRIFICATION; NOSTOCOIDA LIMICOLA; SELECTOR; SLUDGE VOLUME INDEX; SOLIDS RETENTION TIME; TYPE 0041

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143097X126037

Publication date: November 1, 1997

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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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