WangWeiguo,ShanYinghao,LinXueran,et al.Effects of Chlorine?containing Membrane Cleaning Wastewater on Biological Nitrogen Removal and N2O Emissions in Sewage Treatment[J].China Water & Wastewater,2026,42(15):73-81.
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Effects of Chlorine?containing Membrane Cleaning Wastewater on Biological Nitrogen Removal and N2O Emissions in Sewage Treatment

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第42卷 Number: 第15期 Page: 73-81 Column: Date of publication: 2026-08-01
Author(s):
Wang　Weiguo1;  Shan　Yinghao2; 3;  Lin　Xueran1;  Shui　Fei3;  Li　Jining2;  Zhou　Yiwen3;  Tang　Xia1
（1. Guangzhou Sewage Purification Co. Ltd.， Guangzhou 510627， China； 2. College of Environment， Nanjing Normal University， Nanjing 210023， China； 3. Guangdong Key Laboratory of Integrated Agro?environmental Pollution Control and Management， National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China， Institute of Eco?environmental and Soil Sciences， Guangdong Academy of Sciences， Guangzhou 510650， China）
Keywords:
chlorine-containing membrane cleaning wastewater;  nitrification and denitrification;  nitrous oxide (N2O);  microbial community;  nitrogen removal performance
Abstract:
To explore the effects of chlorine-containing membrane cleaning wastewater on the biological nitrogen removal performance and nitrous oxide (N2O) emissions of activated sludge, batch experiments were conducted to simulate nitrification and denitrification processes with chlorine-containing wastewater volume ratios set at 0, 10%, 30%, and 50%. The results showed that as the proportion of chlorine-containing wastewater increased, the nitrification rate decreased significantly from 0.160 mg/(gMLSS·h) to 0.084 mg/(gMLSS·h). The denitrification rate showed a slight increase at the low ratio (10%), reaching 0.79 mg/(gMLSS·h), but was markedly inhibited at higher ratios (30% and 50%), dropping to 0.67 mg/(gMLSS·h) and 0.55 mg/(gMLSS·h), respectively. N2O emissions remained low during nitrification across all groups; however, during denitrification, the peak N2O concentration increased substantially in the high-ratio groups, with the 50% group reaching 261.84 μmol/L. Microbial community analysis revealed that the chlorine-containing wastewater drove succession in the microbial community structure. The relative abundance of chlorine-tolerant genera, such as Pseudomonas, increased from 0.54% to 17.13%, while the abundance of sensitive genera, including Candidatus Accumulibacter and Thauera, declined. This study elucidates the dose-effect relationship of chlorine-containing membrane cleaning wastewater on nitrogen removal and N2O emissions, and provides valuable insights for optimizing recirculation strategies in wastewater treatment plants.
Last Update: 2026-08-01