title: Interactions of specific extracellular organic matter and polyaluminum chloride and their roles in the algae-polluted water treatment.
abstract: Extracellular organic matter (EOM) is ubiquitous in the algae-polluted water and has a significant impact on the human health and drinking water treatment. We investigate the different characteristics of dissolved extracellular organic matter (dEOM) and bound extracellular organic matter (bEOM) recovered from the various growth period of Microcystis aeruginosa and the interactions of them and polyaluminum chloride (PACl). The roles of the different EOM in the algae-polluted water treatment are also discussed. The functional groups of aromatic, OH, NH, CN and NO in bEOM possessing the stronger interaction with hydroxyl aluminum compared with dEOM is responsible for bEOM and algae removal. Some low molecular weight (MW) organic components and protein-like substances in bEOM are most easily removed. And dEOM weakly reacts with PACl or inhibits coagulation, especially dEOM with the high MW organic components. The main coagulation mechanisms of bEOM are the generation of insoluble Al-bEOM through complexation, the bridge of AlO4Al12(OH)24(H2O)127+(Al13), the adsorption of Al(OH)3(am)and the entrapment of flocs. The adsorption of Al13and Al(OH)3(am)mainly contribute to dEOM removal. It is also recommended to treat the algae with dEOM and bEOM at the initial stage.
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Chongqing Key laboratory of Catalysis and Environmental new materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, PR China. Electronic address: txmno1@126.com.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Tang
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China. Electronic address: zhl@cqu.edu.cn.
authors.forename: Huaili
authors.initials: H
authors.lastname: Zheng
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China.
authors.forename: Chuanliang
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China.
authors.forename: Bingzhi
authors.initials: B
authors.lastname: Liu
authors.affiliation: Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Key laboratory of Reservoir Aquatic Environment, Chongqing Institure of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Guo
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D005068:Eutrophication; D005427:Flocculation; D046931:Microcystis / Q000737:chemistry*; D018508:Water Purification
chemical_list: C016213:aluminum oxychloride; D000536:Aluminum Hydroxide
keywords: Algae; Bound extracellular organic matter (bEOM); Coagulation; Dissolved extracellular organic matter (dEOM); Polyaluminum chloride (PACl)