title: Differences in dissolved organic matter between reclaimed water source and drinking water source.
abstract: Dissolved organic matter (DOM) significantly affects the quality of reclaimed water and drinking water. Reclaimed water potable reuse is an effective way to augment drinking water source and de facto reuse exists worldwide. Hence, when reclaimed water source (namely secondary effluent) is blended with drinking water source, understanding the difference in DOM between drinking water source (dDOM) and reclaimed water source (rDOM) is essential. In this study, composition, transformation, and potential risk of dDOM from drinking water source and rDOM from secondary effluent were compared. Generally, the DOC concentration of rDOM and dissolved organic nitrogen (DON) content in reclaimed water source were higher but rDOM exhibited a lower aromaticity. Besides, rDOM comprises a higher proportion of hydrophilic fractions and more low-molecular weight compounds, which are difficult to be removed during coagulation. Although dDOM exhibited higher specific disinfection byproducts formation potential (SDBPFP), rDOM formed more total disinfection byproducts (DBPs) during chlorination including halomethanes (THMs) and haloacetic acids (HAAs) due to high DOC concentration. Likewise, in consideration of DOC basis, rDOM contained more absolute assimilable organic carbon (AOC) despite showing a lower specific AOC (normalized AOC per unit of DOC). Besides, rDOM exhibited higher biotoxicity including genotoxicity and endocrine disruption. Therefore, rDOM presents a greater potential risk than dDOM does. Reclaimed water source needs to be treated carefully when it is blended with drinking water source.
authors.affiliation: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China. Electronic address: hyhu@tsinghua.edu.cn.
authors.forename: Hong-Ying
authors.initials: HY
authors.lastname: Hu
authors.affiliation: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Du
authors.affiliation: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China. Electronic address: wuqianyuan@mail.tsinghua.edu.cn.
authors.forename: Qian-Yuan
authors.initials: QY
authors.lastname: Wu
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Southwest Branch of State Grid Corporation of China, Chengdu 610094, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Tang
authors.affiliation: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Chen
mesh_terms: D004202:Disinfectants / Q000032:analysis; D060766:Drinking Water / Q000737:chemistry*; D004784:Environmental Monitoring; D009930:Organic Chemicals / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification; D062066:Water Resources; D014881:Water Supply
chemical_list: D004202:Disinfectants; D060766:Drinking Water; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical
keywords: Assimilable organic carbon; Disinfection byproducts; Dissolved organic matter; Drinking water; Reclaimed water