title: A mini review of preoxidation to improve coagulation.
abstract: Preoxidation has attracted people's attention due to its effectiveness in enhancing coagulation. The mechanisms, drawbacks and applications in the improvement of coagulation were summarized in this work. Preoxidation can destroy the organic coating on the surface of particles to change the zeta potential, which is the vital reason for improving coagulation. Co-existing metallic ions, such as calcium, iron and manganese, play important roles in the improvement of coagulation due to the formation of metal-humate complexes or the in situ formed coagulant. However, preoxidation could degrade organic matter from high molecular weight to low molecular weight and damage cell membrane of algae, causing intracellular algal organic matter to release outside and producing hydrophilic functional groups to some extent, which has the potential to deteriorate the water quality. Additionally, disinfection byproduct formation is also affected significantly through changing the characteristics of the organic and inorganic precursors. Based on the recent publications, some future developments of preoxidation process were suggested in this study.
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan, 430074, China.
authors.forename: Pengchao
authors.initials: P
authors.lastname: Xie
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan, 430074, China.
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: majun@hit.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zou
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan, 430074, China. Electronic address: zongpingw@hust.edu.cn.
authors.forename: Zongping
authors.initials: Z
authors.lastname: Wang
mesh_terms: D003102:Colloids / Q000737:chemistry*; D004203:Disinfection; D060766:Drinking Water / Q000032:analysis / Q000737:chemistry*; D004553:Electric Conductivity; D005068:Eutrophication; D008670:Metals / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D052638:Particulate Matter / Q000737:chemistry; D018508:Water Purification; D060753:Water Quality
chemical_list: D003102:Colloids; D060766:Drinking Water; D008670:Metals; D016877:Oxidants; D052638:Particulate Matter
keywords: Coagulation; Drawback; Future development; Mechanism; Preoxidation