Comparison of Oxygen-Transfer Measurement Methods Under Process Conditions
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.
Document Type: Research Article
Publication date: March 1, 2004
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