title: Influences of dissolved organic matter characteristics on trihalomethanes formation during chlorine disinfection of membrane bioreactor effluents.
abstract: Dissolved organic matter (DOM) in MBR-treated municipal wastewater intended for reuse was fractionated through ultrafiltration and XAD-8 resin adsorption and characterized by fluorescence spectroscopy. To probe the influences of DOM characteristics on trihalomethanes (THMs) formation reactivity during chlorination, THMs yield and speciation of DOM fractions was investigated. It was found that chlorine reactivity of DOM decreased with the decrease of molecular weight (MW), and MW>30kDa fractions produced over 55% of total THMs in chlorinated MBR effluent. Hydrophobic organics had much higher THMs formation reactivity than hydrophilic substances. Particularly, hydrophobic acids exhibited the highest chlorine reactivity and contributed up to 71% of total THMs formation. Meanwhile, low-MW and hydrophilic DOM were susceptible to produce bromine-containing THMs. Of the fluorescent DOM in MBR effluent, aromatic moieties and humic acid-like had higher chlorine reactivity. Conclusively, macromolecular and hydrophobic organics containing aromatic moieties and humic acid-like must be removed to reduce THMs formation.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Defang
authors.initials: D
authors.lastname: Ma
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Peng
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Yuhang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China. Electronic address: baoyugao_sdu@aliyun.com.
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
mesh_terms: D019149:Bioreactors; D005591:Chemical Fractionation; D002713:Chlorine / Q000302:isolation & purification*; D004203:Disinfection / Q000295:instrumentation* / Q000379:methods*; D054879:Halogenation; D008567:Membranes, Artificial; D008970:Molecular Weight; D011108:Polymers / Q000737:chemistry; D012995:Solubility; D013050:Spectrometry, Fluorescence; D022882:Trihalomethanes / Q000032:analysis*; D014462:Ultrafiltration; D014865:Waste Disposal, Fluid; D060753:Water Quality
chemical_list: D008567:Membranes, Artificial; D011108:Polymers; D022882:Trihalomethanes; C033942:Amberlite XAD-8; D002713:Chlorine
keywords: 3DEEM; Chlorination; Dissolved organic matter; Fractionation; THMs