Effect of DO and C/N on nitrogen and phosphorus removal efficiency of A<sup>2</sup>/O-MBR at low temperature

GUO Xiang; GUO Xinchao; XIONG Jiaqing; ZHOU Jiajia

doi:10.13205/j.hjgc.202501013

Volume 43 Issue 1

Mar. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(1): 118-124

GUO Xiang, GUO Xinchao, XIONG Jiaqing, ZHOU Jiajia. Effect of DO and C/N on nitrogen and phosphorus removal efficiency of A2/O-MBR at low temperature[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 118-124. doi: 10.13205/j.hjgc.202501013

Citation:

GUO Xiang, GUO Xinchao, XIONG Jiaqing, ZHOU Jiajia. Effect of DO and C/N on nitrogen and phosphorus removal efficiency of A²/O-MBR at low temperature[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 118-124. doi: 10.13205/j.hjgc.202501013

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Effect of DO and C/N on nitrogen and phosphorus removal efficiency of A²/O-MBR at low temperature

doi: 10.13205/j.hjgc.202501013

Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Environmental and Municipal Engineering Department, Xi'an University of Architecture and Technology, Xi'an 710055, China

Received Date: 2024-03-29
Accepted Date: 2024-05-27
Rev Recd Date: 2024-05-20

Available Online: 2025-03-21

Publish Date: 2025-03-21

Abstract

Abstract

Affected by low temperature and low pressure, the microbial activity of wastewater treatment plants in plateau area is lower, nitrogen and phosphorus concentration in the effluent is generally higher, and the energy consumption and drug consumption usually remain a high level. In this study, an A²/O-MBR process was selected to study the effects of DO concentration and C/N ratio on nitrogen and phosphorus removal performance of a wastewater treatment system at low temperature. The results showed that when the water temperature in the reactor was 10 ℃, the HRT was 12 h, and the reflux ratio of the two-stage mixture was 200%, the MLSS of the system was 7000 mg/L, far higher than the traditional activated sludge process, and that overcome the lack of microbial activity caused by low temperature to some extent; when DO concentration was 1.0~1.5 mg/L, the denitrification performance of the system was the best, and the average removal rates of NH₄⁺-N and TN were 99.80% and 91.28%, far exceeding the first-class A standard in the Integrated Wastewater Discharge Standard. When DO was too low, it mainly affected the nitrification ability of the system, thus affecting its denitrification performance; when C/N was 5, the average removal rates of NH₄⁺-N and TN were 99.80% and 91.28%, respectively, and the system achieved good nitrogen removal performance. When C/N was too low, denitrification was inhibited, which affected the nitrogen removal performance; under different DO concentrations and C/N ratios, the average removal rate of TP could be stabilized at 95% above, complying with the first-class A standard. Based on the results, the aeration of plateau sewage treatment plants in daily operation can be properly reduced, to reduce the total energy consumption. The research results can also provide reference for improving the efficiency of sewage treatment systems under low temperature condition.
- A²/O-MBR,
- low temperature,
- dissolved oxygen,
- carbon nitrogen ratio,
- nitrogen and phosphorus removal

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References(23)

References

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