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.
降雨冲击下再生水河道水质变化与微生物群落分析
- Title:
- Water Quality Change and Microbial Community Analysis in Reclaimed Water River Channels Subject to Rainfall Events
- Keywords:
- reclaimed water river channel; rainwater runoff; pollutant transportation; microbial community
- 摘要:
- 为初步探索雨水径流排入再生水河道后水环境的变化，搭建了再生水与雨水径流不同体积混合的河道循环流动模拟装置。结果表明，当再生水与雨水的体积比为1∶1和2∶1时，上覆水中NH4+-N和NO3--N浓度呈先升后降的趋势，72 h后分别稳定至（0.50±0.03）和（1.7±0.6） mg/L；当再生水与雨水的体积比为1∶2时，两者均呈现先降低后稳定的趋势。雨水径流输入后，河道中溶解性微生物代谢产物和芳香族蛋白质的平均占比分别下降20.0%和8.3%，腐殖酸平均占比提升15.7%，有机物向难降解组分转化。微生物群落演替方面，在高雨水污染负荷的条件下，变形菌门（Proteobacteria）相对丰度达35.79%。脱氯单胞菌属（Dechloromonas）和硫杆菌属（Thiobacillus）是主要的反硝化菌，可能对脱氮起主导作用；在再生水河道恢复阶段，硝化螺旋菌属（Nitrospira）的占比普遍升高，驱动硝化过程；在降雨冲击阶段，上覆水中氮代谢主要依靠氨氧化和好氧反硝化途径。
- 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.
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