The Influence of Sludge Interchange Times on the Oxic‐Settling‐Anoxic Process

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The oxic‐settling‐anoxic (OSA) system operated as a sequencing batch reactor was studied. Sludge was interchanged between the aerobic and anaerobic reactors, and the number of daily interchange times was changed from 1 to 4 during the experiments. When the sludge was interchanged 1 time/d, the reduction of excess sludge mass was only 52.8%. When the sludge was interchanged 4 times/d, the reduction of excess sludge mass was 77.4%; reductions in the total chemical oxygen demand, total solids, and total volatile solids of both the anaerobic sludge and the aerobic settled sludge were the greatest; and more soluble iron was released from the anaerobic sludge. The water quality of the final effluent in the two systems was close. The investigation showed that interchange times are important in improving sludge reduction efficiency, and the parameter should be regarded as an important operating factor in the OSA process.

Keywords: biosolids; interchange times; oxic‐settling‐anoxic process; sludge reduction

Document Type: Research Article


Publication date: June 1, 2010

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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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