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Destruction of microbial stability in drinking water distribution systems by trace phosphorus polluted water source
Chemosphere ( IF 8.8 ) Pub Date : 2021-02-24 , DOI: 10.1016/j.chemosphere.2021.130032
Xueci Xing , Tong Li , Zhihao Bi , Peng Qi , Zesong Li , Youyi Chen , Huishan Zhou , Haibo Wang , Gang Xu , Chaoxiang Chen , Kunyu Ma , Chun Hu

The effects of trace phosphate concentrations (0, 0.3 and 0.6 mg/L) in water source were investigated on microbial stability of the drinking water distribution systems (DWDSs). Obviously, the results verified that in the effluent of DWDSs simulated by annular reactors (ARs), the total microbial biomass and the absolute concentration of opportunistic pathogens such as Legionella pneumophila, Mycobacterium avium, and Hartmanella vermiformis increased significantly with phosphate concentration increasing. Based on X-ray powder diffractometer and zeta potentials measurement, trace phosphate did change physicochemical properties of corrosion products, hence promoting microbes escape from corrosion products to bulk water to a certain extent. Stimulated by chlorine disinfectant and phosphate, the extracellular polymeric substances (EPS) from the suspended biofilms of AR-0.6 gradually exhibited superior characteristics including higher content, flocculating efficiency, hydrophobicity and tightness degree, contributing to formation of large-scale suspended biofilms with strong chlorine-resistance ability. However, the disinfection by-products concentration in DWDSs barely changed due to the balance of EPS precursors contribution and biodegradation effect, covering up the microbiological water quality risk. Therefore, more attention should be paid to the trace phosphorus polluted water source though its concentration was much lower than wastewater. This is the first study successfully revealing the influence mechanism of trace phosphate on microbial stability in DWDSs, which may help to fully understand the biofilms transformation and microbial community succession in DWDSs.



中文翻译:

微量磷污染水源对饮用水分配系统中微生物稳定性的破坏

研究了饮用水中微量磷酸盐浓度(0、0.3和0.6 mg / L)对饮用水分配系统(DWDSs)微生物稳定性的影响。显然,结果证实了在环形反应器(AR)模拟的DWDS的流出物中,总微生物生物量和机会病原体(如军团菌禽分枝杆菌Hartmanella vermiformis)的绝对浓度随着磷酸盐浓度的增加而显着增加。基于X射线粉末衍射仪和zeta电位测量,痕量磷酸盐确实改变了腐蚀产物的理化性质,因此在一定程度上促进了微生物从腐蚀产物中逸出到大量水中。在氯消毒剂和磷酸盐的刺激下,AR-0.6悬浮生物膜中的细胞外聚合物逐渐表现出较高的含量,絮凝效率,疏水性和密封性等优异特性,有助于形成具有强氯的大规模悬浮生物膜。抵抗能力。但是,由于EPS前体的贡献和生物降解作用之间的平衡,DWDS中消毒副产物的浓度几乎没有变化,掩盖微生物水质风险。因此,尽管痕量磷污染的水源浓度远低于废水,但仍应引起更多关注。这是第一项成功揭示微量磷酸盐对DWDSs微生物稳定性影响机制的研究,这可能有助于充分了解DWDSs中的生物膜转化和微生物群落演替。

更新日期:2021-02-28
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