Optimization of oxygen transfer efficiency determining for microporous aerators under process conditions using the off-gas analysis method

GAO Wei; LI Xiaodong; CHEN Xiangchun; QI Lu; WANG Hongchen; LIU Guohua; LUO Yunxiang

doi:10.13205/j.hjgc.202509005

Volume 43 Issue 9

Sep. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(9): 39-47

GAO Wei, LI Xiaodong, CHEN Xiangchun, QI Lu, WANG Hongchen, LIU Guohua, LUO Yunxiang. Optimization of oxygen transfer efficiency determining for microporous aerators under process conditions using the off-gas analysis method[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(9): 39-47. doi: 10.13205/j.hjgc.202509005

Citation:

GAO Wei, LI Xiaodong, CHEN Xiangchun, QI Lu, WANG Hongchen, LIU Guohua, LUO Yunxiang. Optimization of oxygen transfer efficiency determining for microporous aerators under process conditions using the off-gas analysis method[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(9): 39-47. doi: 10.13205/j.hjgc.202509005

Citation:

GAO Wei, LI Xiaodong, CHEN Xiangchun, QI Lu, WANG Hongchen, LIU Guohua, LUO Yunxiang. Optimization of oxygen transfer efficiency determining for microporous aerators under process conditions using the off-gas analysis method[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(9): 39-47. doi: 10.13205/j.hjgc.202509005

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Optimization of oxygen transfer efficiency determining for microporous aerators under process conditions using the off-gas analysis method

doi: 10.13205/j.hjgc.202509005

1. China South-to-North Water Diversion Corporation Eco-environmental Protection Co., Ltd., Beijing 100036, China;
2. Yunnan Green Energy Industry Group Co., Ltd., Kunming 650228, China;
3. School of Chemistry and Life Resources, Renmin University of China, Beijing 100872, China;
4. Jinan Heating Group Co., Ltd., Ji'nan 250011, China

Received Date: 2024-11-14
Available Online: 2025-11-05
Publish Date: 2025-09-01

Abstract

Abstract

The oxygen transfer efficiency （OTE） of aerators is crucial for the on-site operation of these wastewater treatment plants， and accurately determining the OTE can guide these plants to save energy and reduce consumption. In order to meet the demand for assessing the mass transfer performance of aerators under actual process conditions， this study employed the off-gas analysis method to determine the oxygen transfer efficiency under process conditions （αSOTE） and conducted an impact optimization study. In this study， the effects of the molar fractions of oxygen， carbon dioxide， and water vapor on the testing accuracy of dynamic and static complete off-gas analysis methods were firstly compared. Subsequently， municipal wastewater treatment plants with different treatment processes （A²/O， step aeration process， SBR） were selected. The off-gas analysis method with less influence on testing accuracy was used for on-site testing to investigate the change rules of the OTE of the aerator under different operating conditions， such as treatment processes， sludge concentrations， and sludge ages， etc. The results showed that the static complete off-gas analysis method had no significant influence on the OTE. Moreover， the testing accuracy of this method was less affected； when the OTE value exceeded 16%， the calculation error was only 1%. A field study based on the static complete off-gas analysis method revealed that αSOTE decreased with the increase of sludge concentration and sludge age. αSOTE was significantly affected by influent water quality. In plug-flow aeration basins， αSOTE increased with increasing distance from the inlet.
- microporous aeration,
- oxygen transfer efficiency,
- process status,
- off-gas analysis method,
- optimization

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References(36)

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