Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China.
Zhejiang Xingtuo Ecological Environment Co., Ltd., Hangzhou 310051, China.
J Environ Sci (China). 2024 Dec;146:55-66. doi: 10.1016/j.jes.2023.05.020. Epub 2023 May 24.
The effects of cast iron pipe corrosion on water quality risk and microbial ecology in drinking water distribution systems (DWDSs) were investigated. It was found that trihalomethane (THMs) concentration and antibiotic resistance genes (ARGs) increased sharply in the old DWDSs. Under the same residual chlorine concentration conditions, the adenosine triphosphate concentration in the effluent of old DWDSs (Eff-old) was significantly higher than that in the effluent of new DWDSs. Moreover, stronger bioflocculation ability and weaker hydrophobicity coexisted in the extracellular polymeric substances of Eff-old, meanwhile, iron particles could be well inserted into the structure of the biofilms to enhance the mechanical strength and stability of the biofilms, hence enhancing the formation of THMs. Old DWDSs significantly influenced the microbial community of bulk water and triggered stronger microbial antioxidant systems response, resulting in higher ARGs abundance. Corroded cast iron pipes induced a unique interaction system of biofilms, chlorine, and corrosion products. Therefore, as the age of cast iron pipes increases, the fluctuation of water quality and microbial ecology should be paid more attention to maintain the safety of tap water.
研究了铸铁管腐蚀对饮用水分配系统（DWDS）水质风险和微生物生态的影响。结果表明，旧 DWDS 中的三卤甲烷（THMs）浓度和抗生素抗性基因（ARGs）急剧增加。在相同余氯浓度条件下，旧 DWDS 出水中的三磷酸腺苷（ATP）浓度明显高于新 DWDS 出水中的 ATP 浓度。此外，Eff-old 的胞外聚合物中同时存在较强的生物絮凝能力和较弱的疏水性，同时铁颗粒可以很好地插入生物膜的结构中，从而增强生物膜的机械强度和稳定性，从而增强 THMs 的形成。旧 DWDS 对水体微生物群落有显著影响，并引发更强的微生物抗氧化系统响应，导致更高的 ARGs 丰度。腐蚀的铸铁管诱导了一个独特的生物膜、氯和腐蚀产物相互作用系统。因此，随着铸铁管使用年限的增加，应更加注意水质和微生物生态的波动，以确保自来水的安全。
