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Effects of disinfection efficiency on microbial communities and corrosion processes in drinking water distribution systems simulated with actual running conditions

文献类型: 外文期刊

作者: Zhu, Ying 1 , 2 ; Shen, Fei 1 , 2 ; Deng, Shihuai 1 , 2 ; He, Jinsong 1 , 2 ; Song, Chun 1 , 2 ; Chen, Lu 2 ; Xiao, Hong 2 ; Zhang, Shirong 2 ; Wang, Xie 2 ; Zhang, Jianhua 2 ; Gong, Li 3 ; Hu, Chun 3 ;

作者机构: 1.Sichuan Agr Univ, Inst Ecol & Environm Sci, Chengdu 611130, Sichuan, Peoples R China

2.Sichuan Agr Univ, Rural Environm Protect Engn & Technol Ctr Sichuan, Chengdu 611130, Sichuan, Peoples R China

3.Sichuan Agr Univ, Coll Environm Sci, Chengdu 611130, Sichuan, Peoples R China

4.Sichuan Acad Agr Sci, Soil & Fertilizer Res Inst, Chengdu 610066, Sichuan, Peoples R China

5.Minist Agr & Rural Affairs, Key Lab Agr Environm Southwest China, Chengdu 610066, Sichuan, Peoples R China

6.Sichuan Agr Univ, Coll Forestry, Chengdu 611130, Sichuan, Peoples R China

7.Guangzhou Univ, Inst Environm Res Greater Bay, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Guangzhou 510006, Guangdong, Peoples R China

关键词: Disinfection efficiency; Biofilm; Iron-recycling bacteria; Corrosion; Drinking water distribution systems

期刊名称: JOURNAL OF ENVIRONMENTAL SCIENCES

ISSN: 1001-0742

年卷期: 2020 年 88 卷

页码:

收录情况: SCI

摘要: The effects of disinfection efficiency on microbial communities and the corrosion of cast iron pipes in drinking water distribution systems (DWDSs) were studied. Two annular reactors (ARs) that simulated actual running conditions with UV/Cl-2 disinfection and chlorination alone were used. High chlorine consumption and corrosion rate were found in the AR with UV/Cl-2. According to functional genes and pyrosequencing tests, a high percentage of iron recycling bacteria was detected within the biofilm of the AR with Cl-2 at early running stage, whereas siderophore-producing bacteria were dominant in the biofilm of the AR with UV/Cl-2. At the early running stage, the sequential use of UV light and an initial high chlorine dosage suppressed the biomass and iron-recycling bacteria in both bulk water and biofilms, thereby forming less protective scales against further corrosion, which enhanced chlorine consumption. Non-metric multidimensional scaling analysis showed that the bacterial communities in the ARs shaped from within rather than being imported by influents. These results indicate that the initial high disinfection efficiency within the distribution system had not contributed to the accumulation of iron-recycling bacteria at the early running stages. This study offer certain implications for controlling corrosion and water quality in DWDSs. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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