title: Effects of dissolved organic matter size fractions on trihalomethanes formation in MBR effluents during chlorine disinfection.
abstract: In this study, effects of dissolved organic matter (DOM) size fractions on trihalomethanes (THMs) formation in MBR effluents during chlorination were investigated by fractionating DOM into >100, 30-100, 10-30, 5-10 and <5 kDa fractions using ultrafiltration (UF) membranes based on molecular weight (MW). Fractions of MW>30 kDa constituted 87% of DOM and were the main THMs precursors, which exhibited higher specific ultraviolet absorbance (SUVA) and THMs formation potential (THMFP) and should be reduced to control THMs formation. For these fractions, THMs formation was mostly attributed to slow chlorine decay, and THMs yield coefficients were low because halogenated intermediates derived from the macromolecular DOM were difficult to decompose to produce THMs. Moreover, there was a strong linear correlation between dissolved organic carbon (DOC) concentration and THMFP (R(2)=0.981), as well as between the SUVA and specific THMFP (R(2)=0.993) in all fractions.
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.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Shenglei
authors.initials: S
authors.lastname: Sun
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
mesh_terms: D000042:Absorption; D019149:Bioreactors; D005591:Chemical Fractionation; D002713:Chlorine / Q000737:chemistry*; D004203:Disinfection; D005374:Filtration; D054879:Halogenation; D007700:Kinetics; D008567:Membranes, Artificial; D008956:Models, Chemical; D008970:Molecular Weight; D009930:Organic Chemicals / Q000737:chemistry*; D012995:Solubility; D022882:Trihalomethanes / Q000138:chemical synthesis*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid
chemical_list: D008567:Membranes, Artificial; D009930:Organic Chemicals; D022882:Trihalomethanes; D002713:Chlorine