FEIJie,MAOHui,WANGYa-chao,et al.Distribution Characteristics and Spatiotemporal Variation of Microbial Communities throughout Entire Water Supply System[J].China Water & Wastewater,2025,41(17):90-98.
供水系统全流程微生物群落分布特征及时空变化
- Title:
- Distribution Characteristics and Spatiotemporal Variation of Microbial Communities throughout Entire Water Supply System
- Keywords:
- drinking water; multi-source water supply system; microbial community; gene sequencing; environmental factor
- 摘要:
- 水质差异和微生物菌群的复杂性关联着供水系统的水质安全，深入研究供水系统中从水源到水龙头的微生物群落特征，对降低水传播疾病的风险、保障饮用水水质安全至关重要。为此，以多水源多水厂供水系统为例，采用16S rRNA测序技术和多元统计分析方法，系统分析了供水系统中微生物群落的时空分布、组装过程以及对环境变量的响应。结果表明，多水源水经不同水厂处理后，TOC去除率可达73.3%~85.7%，夏季效果逊于春季，且源头到龙头微生物多样性逐级降低。供水系统全流程中的微生物Shannon指数在夏季比春季高8.5%~19.8%，群落内竞争协同作用更复杂，但不同季节、不同处理阶段的微生物组装机制均由确定性过程主导。致病菌与耐氯菌在供水系统中的分布与存活状态受理化指标的影响，春季时TOC为关键因素，夏季时DO与余氯成为更为关键的调控因子。
- Abstract:
- Water quality variation and the complexity of microbial communities are closely associated with the safety of water supply system (WSS). A comprehensive understanding of microbial community dynamics from the source water to the tap water is critical for mitigating the risk of waterborne diseases and ensuring the safety and quality of drinking water. The 16S rRNA sequencing technique, together with multivariate statistical analysis methods, was employed to systematically investigate the spatiotemporal distribution patterns, assembly mechanisms, and response to environmental variables of the microbial communities within a multi?source and multi-waterworks WSS. After undergoing treatment at various waterworks, the total organic carbon（TOC） removal efficiency of multi-source water ranged from 73.3% to 85.7%. The treatment effectiveness tended to be lower in summer compared to spring, and microbial diversity showed a gradual decline from the source water to tap water. The Shannon index of microorganisms throughout the entire WSS was observed to be 8.5% to 19.8% higher during summer compared to spring. The interactions within the microbial community, including both competitive and cooperative effects, exhibited increased complexity. However, the microbial assembly mechanisms across different seasons and treatment stages were predominantly governed by deterministic processes. The distribution and survival of pathogenic and chlorine?tolerant bacteria within the WSS were influenced by physicochemical indicators. In spring, TOC emerged as a significant factor, whereas in summer, dissolved oxygen (DO) and residual chlorine played more critical regulatory roles.
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