title: Insight into changes during coagulation in NOM reactivity for trihalomethanes and haloacetic acids formation.
abstract: Natural organic matter (NOM) in raw water can contribute in many ways to the poor quality of drinking water, including the formation of disinfection byproducts such as trihalomethanes (THM) and haloacetic acids (HAA) during disinfection. This paper investigates the role of individual NOM fractions on changes in THM and HAA formation during coagulation with iron chloride (FeCl3) and a combination of polyaluminium chloride and iron chloride (FeCl3/PACl). The dissolved organic carbon (DOC) in the raw water and after coagulation was fractionated into four fractions, based on their hydrophobicity. Fractionation showed that most of the DOC (68%) in the raw water comes from the fulvic acid fraction, yielding 41% of the total THM precursors and 21% of the total HAA precursors. Both coagulants remove the humic acid fraction, but result in different changes to the reactivity of the remaining NOM fractions towards THM and HAA formation, indicating that coagulation occurs by different pathways, depending upon the type of coagulant used. In particular, significant changes in the reactivities of the hydrophilic acidic and non-acidic fractions were observed.
authors: University of Novi Sad, Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia. aleksandra.tubic@dh.uns.ac.rs
authors: Aleksandra
authors: A
authors: Tubić
authors: Jasmina
authors: J
authors: Agbaba
authors: Božo
authors: B
authors: Dalmacija
authors: Jelena
authors: J
authors: Molnar
authors: Snežana
authors: S
authors: Maletić
authors: Malcolm
authors: M
authors: Watson
authors: Svetlana Ugarčina
authors: SU
authors: Perović
mesh_terms: D000085:Acetates / Q000737:chemistry*; D000536:Aluminum Hydroxide / Q000737:chemistry; D062845:Chloroacetates / Q000737:chemistry*; D002845:Chromatography; D060766:Drinking Water / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D006812:Humic Substances / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet; D022882:Trihalomethanes / Q000737:chemistry*; D018508:Water Purification; D060753:Water Quality
chemical_list: D000085:Acetates; D062845:Chloroacetates; D060766:Drinking Water; D005296:Ferrous Compounds; D006812:Humic Substances; D022882:Trihalomethanes; C016213:aluminum oxychloride; D000536:Aluminum Hydroxide; C016274:bromoacetate; C029451:ferrous chloride