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Direct evidence of microbiological water quality changes on bacterial quantity and community caused by plumbing system

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Journal of Environmental Sciences 2022年第6期34卷 175-183页

作者： Jun Li Anran Ren Ed van der Mark Gang Liu Key Laboratory of Drinking water Science and Technology Research Centre for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Dunea water Company Plaza of the United Nations 11-15Zoetermeer 2700 ATthe Netherlands Sanitary engineering Department of Water managementFaculty of Civil Engineering and GeosciencesDelft University of TechnologyDelft 2600 GAthe Netherlands

Drinking water quality deteriorates from treatment plant to customer taps, especially in the plumbing system. There is no direct evidence about what the differences are contributed by plumbing system. This study compared the water quality in the water main and at customer tap by preparing a sampling tap on the water main. The biomass was quantified by adenosine triphosphate(ATP) and the microbial community was profiled by 454 *** results showed that in distribution pipes, biofilm contributed >94% of the total biomass,while loose deposits showed little contribution(water had minor effects on the microbiocidal water quality regarding both quantity(ATP 1 ng/L vs. 1.7 ng/L) and community of the bacteria. Whereas the plumbing system has significant contribution to the increase of active biomass(1.7 ng/L vs. 2.9 ng/L) and the changes of bacterial community. The relative abundance of Sphingomonas spp. at tap(22%) was higher than that at water main(2%), while the relative abundance of Pseudomonas spp. in tap water(15%) was lower than that in the water from street water main(29%). Though only one location was prepared and studied, the present study showed that the protocol of making sampling tap on water main offered directly evidences about the impacts of plumbing system on tap water quality, which makes it possible to distinguish and study the processes in distribution system and plumbing system separately.

关键词： Drinking water distribution system Plumbing system microbiological water quality Sampling program 454 pyrosequencing

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microbiological quality of roof tank water in an urban village in southeastern China

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Journal of Environmental Sciences 2023年第3期125卷 148-159页

作者： Dong Hu Jie Zeng Jing Chen Wenfang Lin Xinyan Xiao Mingbao Feng Xin Yu Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Shitang Community Health Service Center Xiamen 361026China College of the Environment and Ecology Xiamen UniversityXiamen 361005China

Urban villages are unique residential neighborhoods in urban areas in China. Roof tanks are their main form of water supply, and water quality deterioration might occur in this system because of poor hygienic conditions and maintenance. In this study, water samples were seasonally collected from an urban village to investigate the influence of roof tanks as an additional water storage device on the variation in the microbial community structure and pathogenic gene markers. water stagnation in the roof tank induced significant decreases in chlorine(p water samples(2.14 ± 1.81 × 105gene copies/mL) than that in input water samples(3.57 ± 2.90 × 104gene copies/mL, p water supply is restored after the water outages, which can trigger an increase in turbidity and bacterial biomass. Overall, the findings provide practical suggestions for controlling microbiological health risks in roof tanks in urban villages.

关键词： Urban village water storage tank microbiological water quality Propidium monoazide(PMA)-qPCR Illumina sequencing

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