Potential shift of bacterial community structure and corrosion-related bacteria in drinking water distribution pipeline
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RESEARCH ARTICLE
Potential shift of bacterial community structure and corrosion-related bacteria in drinking water distribution pipeline driven by water source switching Yue Hu1,2, Ding Dong3, Kun Wan4, Chao Chen5, Xin Yu1,4, Huirong Lin (✉)6 1 Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China 2 College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China 3 Research Institute for Environmental Innovation (Suzhou), Tsinghua, Suzhou 215163, China 4 College of Environment & Ecology, Xiamen University, Xiamen 361102, China 5 School of Environment, Tsinghua University, Beijing 100084, China 6 Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
HIGHLIGHTS
GRAPHIC ABSTRACT
• Bacterial release from aged pipe sections under extreme conditions was quantified. • Released bacterial community structure exhibited large variation after transition. • Risks from transition reduced significantly with cleaner source.
ARTICLE INFO Article history:
Received 9 April 2020 Revised 25 July 2020 Accepted 29 July 2020 Available online 9 September 2020 Keywords: Drinking water biosafety Water source switching Drinking water distribution system Transition effects High-throughput sequencing
ABSTRACT As a result of pollution in the present water sources, cities have been forced to utilize cleaner water sources. There are few reports regarding the potential shift of bacterial community structure driven by water source switching, especially that of corrosion-related bacteria. Three types of finished water were used for simulation, the polluted source water from the Qiantang and Dongtiaoxi Rivers (China) was replaced by cleaner water from Qiandao Lake (China). Here, we discussed the transition effects through three simulated reactors. The bacterial characteristics were identified using the highthroughput sequencing and heterotrophic plate count method. It was observed that the level of culturable bacteria declined by 2–3 orders of magnitude after water source switching. The bacterial community released from the pipeline reactor was significantly different under different finished water, and it exhibited large variation at the genus level. Porphyrobacter (58.2%) and Phreatobacter (14.5%) clearly replaced Novosphingobium, Aquabacterium, and Cupriavidus as new dominant genera in system A, which could be attributed to the lower carbon and nitrogen content of the new water source. Although corrosion-inhibiting bacteria decreased after switching, they still maintained dominant in three reactors (6.6%, 15.9%, and 19.7%). Furthermore, potential opportunistic pathogens such as Sphingomonas were detected. Our study shows that after transition to a high quality water source, the total culturable bacteria released was in a downtrend, which leads to a great reduction in the risk of bacterial leakage in the produced drinking water. © Higher Education Press 2020
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