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| Influence of microbial community on iron release under stagnation condition in drinking water systems |
| YE Ping1, SHENTU Hua-bin2,3, CHEN Huan-yu4, LI Hang-jia1, XU Bing1, ZHANG Yi-fu2, WANG Lei5, LIU Jing-qing2 |
1. Jiayuan Water Supply and Sewerage Company, Jiaxing 314000, China;
2. College of Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;
3. Shanghai Water Engineering Design & Research Institute Co. Ltd, Shanghai 200063, China;
4. Binhai Industrial Technology Research Institute of Zhejiang University, Tianjin 300301, China;
5. College of Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China |
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Abstract To investigate the influence of total bacteria and microbial community structure on the iron release in water supply pipes under stagnation condition, the research was carried on the pilot platform constructed in actual water supply system. The number of culturable corrosive bacteria was counted by conventional R2A cultural method, and microbial community structure was analyzed using high-throughput sequencing (454 pyrosequencing). Results show that Proteobacteria, which account for 86.69%~91.36% in pipe biofilms under stagnation condition, are the dominant microbial community in phylum level. In class level, the content of Alphaproteobacteria, Betaproteobacteria and Actinobacteria excesses half of the total amount. The total iron concentration and iron oxidizing bacteria had a strong correlation with sulfate reducing bacteria. In ductile cast iron pipes, the influence of corrosive bacteria on total iron release is greater than that of HDPE pipes. By correlation coefficient and RDA analysis, it is observed that Proteobacteria, Actinobacteria and Acidobacteria in phylum level and Alphaproteobacteria, Betaproteobacteria and Bacilli in class level promote iron release.
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Received: 04 May 2017
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