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Comparison of Oxygen-Transfer Measurement Methods Under Process Conditions

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Abstract:

The objective of this paper is to compare the following four methods of measuring oxygen transfer in wastewater treatment plants under process conditions: the offgas, hydrogen peroxide (H2O2), reaeration, and in situ oxygen uptake rate (OUR) methods. Comparative tests were performed under controlled conditions in a pilot column and in six full-scale oxidation ditches equipped with fine-bubble diffusers and slow-speed mixers.

The offgas and H2O2 methods give similar results (differences between the oxygen-transfer coefficients under field conditions [kLaf] from each method lower than 10%). The reaeration procedure gives more random results (differences from −5 to −43% compared with values obtained using the offgas method). The in situ OUR method, in the presence of a horizontal flow of mixed liquor, leads to an estimate of kLaf to within 15% of the offgas value.

Keywords: ACTIVATED SLUDGE; FINE-BUBBLE AERATION SYSTEM; HYDROGEN PEROXIDE H2O2 METHOD; OFFGAS METHOD; OXYGEN TRANSFER; OXYGEN UPTAKE RATE METHOD; REAERATION METHOD; WASTEWATER

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143004X141726

Publication date: March 1, 2004

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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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