College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin, 300384, China.
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing, 100085, China.
Environ Sci Pollut Res Int. 2017 Dec;24(36):28220-28238. doi: 10.1007/s11356-017-0370-y. Epub 2017 Oct 11.
Inter-basin water transfer and source water switching will be increasingly launched due to significant population increase and the shortage of the local water resources in cities around the world. Source water switch may cause physiochemical and microbiological de-stabilization of pipe material, biofilms, and loose deposits in drinking water distribution system (DWDS). Great sulfate alteration during source water switch had been deemed as the main cause of a red water case that occurred in a northern China city. To ascertain the relationship between water quality changing and bacterial communities of biofilms in DWDS and possible bacteria risk in a red water case, water quality changing experiments in simulated DWDSs were conducted for approximately 2 years. Twenty-five corrosion scale samples and eight water samples collected from pipe harvest sites or during experimental periods were analyzed for their bacterial community composition by 454-pyrosequencing technology. Taxonomy results together with redundancy analysis (RDA) or canonical correspondence analysis (CCA) and hierarchical cluster analysis all indicated that bacterial community of samples with groundwater (GW) or surface water (SW) supply history and their variations under high sulfate water were rather different owing to different water source histories and the original pipe scale characteristics. Potential opportunistic pathogens: Burkholderia, Escherichia-Shigella, Mycobacterium, Serratia, Ralstonia, Novosphingobium, Flavobacterium, Sphingomonas, and Sphingopyxis were observed in scale or water samples.
由于世界上许多城市的人口增长和当地水资源短缺，跨流域调水和水源切换将越来越多地进行。水源切换可能会导致饮用水配水系统（DWDS）中的管材料、生物膜和松散沉积物的理化和微生物稳定性丧失。在水源切换过程中发生的大量硫酸盐变质被认为是中国北方一个城市发生红色水事件的主要原因。为了确定 DWDS 中水质变化与生物膜细菌群落之间的关系以及红色水事件中可能存在的细菌风险，在模拟 DWDS 中进行了为期约 2 年的水质变化实验。通过 454 焦磷酸测序技术对来自管收获部位或实验期间的 25 个腐蚀垢样本和 8 个水样的细菌群落组成进行了分析。分类学结果以及冗余分析（RDA）或典范对应分析（CCA）和层次聚类分析都表明，具有地下水（GW）或地表水（SW）供应历史的样品的细菌群落及其在高硫酸盐水中的变化因水源历史和原始管垢特征的不同而有很大差异。在垢或水样中观察到潜在的机会性病原体：伯克霍尔德菌、大肠埃希氏菌-志贺氏菌、分枝杆菌、沙雷氏菌、罗尔斯通氏菌、新鞘氨醇单胞菌、黄杆菌、鞘氨醇单胞菌和鞘氨醇球菌。
