title: Disinfection by-product formation during chlor(am)ination of algal organic matters (AOM) extracted from Microcystis aeruginosa: effect of growth phases, AOM and bromide concentration.
abstract: Algae organic matter (AOM), including extracellular organic matter (EOM) and intracellular organic matter (IOM), has caused a series of problems to the water quality, among which formation of disinfection by-products (DBPs) during subsequent chlor(am)ination process was especially serious and concerned. This study characterized physicochemical properties of the EOM and IOM solution extracted from different growth phases of Microcystis aeruginosa and investigated the corresponding formation potential of DBPs during chlor(am)ination process. Besides, the effects of initial concentration of xEOM, IOM, and Br-on the yields of disinfection by-product formation potential were studied. The results indicated that the specific UV absorbance (SUVA254) values of IOM and EOM (1.09 and 2.66 L/mg m) were considerably lower than that of natural organic matter (NOM) (4.79 L/mg m). Fluorescence dates showed the soluble microbial by-product was dominant in both EOM and IOM, and the tryptophan was the main component of AOM. From the excitation-emission matrix figure of EOM and IOM, we found that the content of the high molecular weight protein substance in IOM was higher than EOM. During chlorination of EOM and IOM, the yields of four kinds of DBPs followed the order trichloroethene (TCM) > 1,1-DCP > dichloride acetonitrile (DCAN) > trichloronitromethane (TCNM), while the order was TCM > DCAN > TCNM > 1,1-DCP during chloramination process. The bromine substitution factor (BSF) value increased with the increasing of the concentration of Br-. When the concentration of Br-was 500 μg/L, the BSF values of chlorination EOM and IOM were 51.1 and 68.4%, respectively. As the concentration of Br-increased, the formation of Cl-DBPs was inhibited and the formation of Br-DBPs was promoted. Graphical abstract ᅟ.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.|College of Architecture and Civil Engineering, Xinjiang University, Urumqi, 830047, China.
authors.forename: Juxiang
authors.initials: J
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China. gaonaiyun@126.com.
authors.forename: Naiyun
authors.initials: N
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.
authors.forename: Mingqiu
authors.initials: M
authors.lastname: Zhu
authors.affiliation: College of Architecture and Civil Engineering, Xinjiang University, Urumqi, 830047, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.
authors.forename: Yansen
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D001965:Bromides / Q000737:chemistry; D004203:Disinfection; D054879:Halogenation; D006843:Hydrocarbons, Chlorinated; D046931:Microcystis
chemical_list: D001965:Bromides; D006843:Hydrocarbons, Chlorinated; C100187:chloropicrin
keywords: Algae organic matter (AOM); C disinfection by-products (C-DBPs); Extracellular organic matter (EOM); Intracellular organic matter (IOM); Microcystis aeruginosa; N disinfection by-products (N-DBPs)