Characterization of biofilm and corrosion of cast iron pipes in drinking water distribution system with UV/Cl2 disinfection

WATER RESEARCH

卷:60

Article

Zhu, Ying¹  Wang, Haibo¹  Li, Xiaoxiao¹  Hu, Chun¹  Yang, Min¹  Qu, Jiuhui¹ 

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Aquat Sci & Technol, Beijing 100085, Peoples R China

关键词: Biofilm;    Corrosion;    Disinfection;    Water quality;    Drinking water distribution system;   

DOI  :  10.1016/j.watres.2014.04.035

来源: Elsevier

【 摘 要 】

The effect of UV/Cl-2 disinfection on the biofilm and corrosion of cast iron pipes in drinking water distribution system were studied using annular reactors (ARs). Passivation occurred more rapidly in the AR with UV/Cl-2 than in the one with Cl-2 alone, decreasing iron release for higher corrosivity of water. Based on functional gene, pyrosequencing assays and principal component analysis, UV disinfection not only reduced the required initial chlorine dose, but also enhanced denitrifying functional bacteria advantage in the biofilm of corrosion scales. The nitrate-reducing bacteria (NRB) Dechloromonas exhibited the greatest corrosion inhibition by inducing the redox cycling of iron to enhance the precipitation of iron oxides and formation of Fe3O4 in the AR with UV/Cl-2, while the rhizobia Bradyrhizobium and Rhizobium, and the NRB Sphingomonas, Brucella producing siderophores had weaker corrosion-inhibition effect by capturing iron in the AR with Cl-2. These results indicated that the microbial redox cycling of iron was possibly responsible for higher corrosion inhibition and lower effect of water Larson-Skold Index (LI) changes on corrosion. This finding could be applied toward the control of water quality in drinking water distribution systems. (C) 2014 Elsevier Ltd. All rights reserved.

【 授权许可】

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