XUEChong?hua,ZHAOYi-meng,TANXu,et al.Water Quality Change and Microbial Community Analysis in Reclaimed Water River Channels Subject to Rainfall Events[J].China Water & Wastewater,2025,41(23):141-149.
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Water Quality Change and Microbial Community Analysis in Reclaimed Water River Channels Subject to Rainfall Events

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第23期 Page: 141-149 Column: Date of publication: 2025-12-01
Author(s):
XUE　Chong?hua1; 2;  ZHAO　Yi-meng1; 2;  TAN　Xu1; 2; 3;  WANG　Jian-long1; 2;  LIANG　Man-man1; 2;  REN　Ya-xin1; 2;  LI　Hai-yan1; 2;  LI　Jun-qi1; 2
（1. Key Laboratory of Urban Stormwater System and Water Environment ， Beijing University of Civil Engineering and Architecture， Beijing 102616， China； 2. Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co?construction Collaboration Innovation Center， Beijing University of Civil Engineering and Architecture， Beijing 102616， China； 3. China Architecture Design & Research Group Co. Ltd.， Beijing 100044， China）
Keywords:
reclaimed water river channel;  rainwater runoff;  pollutant transportation;  microbial community
Abstract:
A river circulation flow simulation system was developed to model the mixing of varying volumes of reclaimed water and rainwater runoff, so as to preliminarily investigate the changes in the aquatic environment following the discharge of rainwater runoff into a reclaimed water river channel. When the volume ratio of reclaimed water to rainwater was 1∶1 and 2∶1, the concentrations of NH4+-N and NO3--N in the overlying water exhibited an initial increase followed by a gradual decrease, eventually stabilizing at (0.50±0.03) mg/L and (1.7±0.6) mg/L after 72 hours， respectively. When the volume ratio was 1∶2, both nitrogen species displayed an initial decline followed by stabilization. Following the input of rainwater runoff, the average proportions of dissolved microbial metabolic products and aromatic proteins in the river channel decreased by 20.0% and 8.3%, respectively, whereas the average proportion of humic acid increased by 15.7%, indicating a transformation of organic matters into more refractory components. Regarding microbial community succession, the relative abundance of Proteobacteria reached 35.79% under conditions of high rainwater pollution loads. Dechloromonas and Thiobacillus were the predominant denitrifying bacterial genera and likely played a central role in nitrogen removal processes. During the restoration phase of reclaimed water river channels, the relative abundance of Nitrospira typically increased, thereby promoting the nitrification process. During the rainfall event, nitrogen metabolism in the overlying water was likely predominantly mediated by ammonia oxidation and aerobic denitrification processes.
Last Update: 2025-12-01