title: Impact of pre-ozonation on disinfection by-product formation and speciation from chlor(am)ination of algal organic matter of Microcystis aeruginosa.
abstract: The increasing use of algal-impacted source waters is increasing concerns over exposure to disinfection byproducts (DBPs) in drinking water disinfection, due to the higher concentrations of DBP precursors in these waters. The impact of pre-ozonation on the formation and speciation of DBPs during subsequent chlorination and chloramination of algal organic matter (AOM), including extracellular organic matter (EOM) and intracellular organic matter (IOM), was investigated. During subsequent chlorination, ozonation pretreatment reduced the formation of haloacetonitriles from EOM, but increased the yields of trihalomethanes, dihaloacetic acid and trichloronitromethane from both EOM and IOM. While in chloramination, pre-ozonation remarkably enhanced the yields of several carbonaceous DBPs from IOM, and significantly minimized the nitrogenous DBP precursors. Also, the yield of 1,1-dichloro-2-propanone from IOM was decreased by 24.0% after pre-ozonation during chloramination. Both increases and decreases in the bromine substitution factors (BSF) of AOM were observed with ozone pretreatment at the low bromide level (50μg/L). However, pre-ozonation played little impact on the bromide substitution in DBPs at the high bromide level (500μg/L). This information was used to guide the design and practical operation of pre-ozonation in drinking water treatment plants using algae-rich waters.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environment Science and Engineering, Tongji University, Shanghai 200092, China; Jiangsu post & telecommunications planning and designing institute CO., LTD, Nanjing 210019, China.
authors.forename: Mingqiu
authors.initials: M
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environment Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: gaonaiyun1@126.com.
authors.forename: Naiyun
authors.initials: N
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environment Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: waterman@tongji.edu.cn.
authors.forename: Wenhai
authors.initials: W
authors.lastname: Chu
authors.affiliation: Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China.
authors.forename: Shiqing
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Yixing Jiubin Waterworks, Yixing 214200, China.
authors.forename: Zhengde
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Yixing Jiubin Waterworks, Yixing 214200, China.
authors.forename: Yaqun
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Yixing Jiubin Waterworks, Yixing 214200, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Dai
mesh_terms: D001965:Bromides / Q000737:chemistry; D001966:Bromine / Q000737:chemistry; D004202:Disinfectants / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry; D054879:Halogenation; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry; D046931:Microcystis / Q000302:isolation & purification*; D010126:Ozone / Q000737:chemistry*; D022882:Trihalomethanes / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D001965:Bromides; D004202:Disinfectants; D060766:Drinking Water; D006843:Hydrocarbons, Chlorinated; D022882:Trihalomethanes; D014874:Water Pollutants, Chemical; D010126:Ozone; C100187:chloropicrin; D001966:Bromine
keywords: Algal organic matter; Bromine substitution factors; Chloramination; Chlorination; Disinfection by-products; Pre-ozonation