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Comparison of Dissolved-Organic-Carbon Residuals from Air- and Pure-Oxygen-Activated-Sludge Sequencing-Batch Reactors

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Literature shows that full-scale pure-oxygen activated sludge (O 2-AS) wastewater treatment plants (WWTPs) generate effluents with higher dissolved-organic carbon (DOC) concentrations and larger high-molecular-weight fractions compared to air-activated-sludge (Air-AS) WWTP effluents. The purpose of this paper was to evaluate how gas supplied (air vs. pure oxygen) to sequencing-batch reactors affected DOC transformations. The main conclusions of this paper are (a) O 2-AS effluent DOC is more refractory than air-AS effluent DOC; and (b) O 2-AS systems may have higher five-day biochemical oxygen demand removals than air-AS systems; however, in terms of COD and DOC removal, air-AS systems are better than O 2-AS systems. Analysis of a database from side-by-side O 2- and air-AS pilot tests from literature supported these observations.

Keywords: air-activated sludge; dissolved-organic carbon; extracellular polymers; molecular-weight distribution; pure-oxygen-activated sludge

Document Type: Research Article


Publication date: 2006-03-01

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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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