title: The spatial distribution of pollutants in pipe-scale of large-diameter pipelines in a drinking water distribution system.
abstract: In large-diameter drinking water pipelines, spatial differences in hydraulic and physiochemical conditions may also result in spatial variations in pipe corrosion, biofilm growth and pollutant accumulation. In this article, the spatial distributions of various metals and organic contaminants in two 19-year-old grey cast iron pipes which had an internal diameter of 600mm (DN600), were investigated and analyzed by Atomic Absorption Spectrometry, Gas Chromatography-Mass Spectrometry, Energy Dispersive Spectrometer, X-ray Diffraction, etc. The spatial distribution of heavy metals varied significantly across the pipe section, and iron, manganese, lead, copper, and chromium were highest in concentration in the upper portion pipe-scales. However, the highest aluminum and zinc content was detected in the lower portion pipe-scales. Apart from some common types of hydrocarbons formed by microbial metabolites, there were also some microalgae metabolites and exogenous contaminants accumulated in pipe-scale, which also exhibited high diversity between different spatial locations. The spatial distributions of the physical and chemical properties of pipe-scale and contaminants were quite different in large-diameter pipes. The finding put forward higher requirements on the research method about drinking water distribution system chemical safety. And the scientific community need understand trend and dynamics of drinking water pipe systems better.
authors.affiliation: College of Engineering and Architecture, Zhejiang University, Hangzhou 310058, China.
authors.forename: Jingqing
authors.initials: J
authors.lastname: Liu
authors.affiliation: College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Binhai Industrial Technology Research Institute of Zhejiang University, Tianjin 300000, China.
authors.forename: Huanyu
authors.initials: H
authors.lastname: Chen
authors.affiliation: College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
authors.forename: Lingdan
authors.initials: L
authors.lastname: Yao
authors.affiliation: College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
authors.forename: Zongyuan
authors.initials: Z
authors.lastname: Wei
authors.affiliation: College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China. Electronic address: loulp@zju.edu.cn.
authors.forename: Liping
authors.initials: L
authors.lastname: Lou
authors.affiliation: Environmental Protection Agency, Office of Research and Development, NRMRL, Cincinnati, OH 45220, USA.
authors.forename: Yonggui
authors.initials: Y
authors.lastname: Shan
authors.affiliation: Environmental Protection Agency, Office of Research and Development, NRMRL, Cincinnati, OH 45220, USA.
authors.forename: Sahle-Demessie
authors.initials: SD
authors.lastname: Endalkachew
authors.affiliation: Environmental Protection Agency, Office of Research and Development, NRMRL, Cincinnati, OH 45220, USA.
authors.forename: Nadagouda
authors.initials: N
authors.lastname: Mallikarjuna
authors.affiliation: College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
authors.forename: Baolan
authors.initials: B
authors.lastname: Hu
authors.affiliation: Shaoxing Water Environmental Science Institute Co. Ltd, Zhejiang 312000, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zhou
keywords: Drinking water distribution system; Heavy metals; Organic deposit; Pipe-scale