title: Influence of oxidation on fulvic acids composition and biodegradability.
abstract: Oxidation is well-known process of transforming natural organic matter during the treatment of drinking water. Chlorine, ozone, and chlorine dioxide are common oxidants used in water treatment technologies for this purpose. We studied the influence of different doses of these oxidants on by-products formation and changes in biodegradable dissolved organic carbon (BDOC) and molecular weight distribution (MWD) of fulvic acids (FA) with different BDOC content. Chlorination did not significantly change the MWD of FA and disinfection by-products formation. However, higher molecular weight compounds, than those in the initial FA, were formed. It could be a result of chlorine substitution into the FA structure. Chlorine dioxide oxidized FA stronger than chlorine. During ozonation of FA, we found the highest increase of BDOD due to the formation of a high amount of organic acids and aldehydes. FA molecules were transformed into a more biodegradable form. Ozonation is the most preferable process among those observed for pre-treatment of FA before biofiltration.
authors.affiliation: Institute of Colloid Chemistry and Chemistry of Water, National Academy of Sciences of Ukraine, 42 Vernadsky Avenue, Kyiv 03680, Ukraine. ivan.kozyatnyk@chem.umu.se
authors.forename: Ivan
authors.initials: I
authors.lastname: Kozyatnyk
authors.forename: Joanna
authors.initials: J
authors.lastname: Świetlik
authors.forename: Ursula
authors.initials: U
authors.lastname: Raczyk-Stanisławiak
authors.forename: Agata
authors.initials: A
authors.lastname: Dąbrowska
authors.forename: Nataliya
authors.initials: N
authors.lastname: Klymenko
authors.forename: Jacek
authors.initials: J
authors.lastname: Nawrocki
mesh_terms: D001578:Benzopyrans / Q000737:chemistry* / Q000302:isolation & purification; D001673:Biodegradation, Environmental; D002244:Carbon / Q000032:analysis; D002713:Chlorine / Q000737:chemistry*; D017606:Chlorine Compounds / Q000737:chemistry*; D060766:Drinking Water / Q000032:analysis; D054879:Halogenation; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D001578:Benzopyrans; D017606:Chlorine Compounds; D060766:Drinking Water; D016877:Oxidants; D010087:Oxides; D002713:Chlorine; D010126:Ozone; D002244:Carbon; C025109:chlorine dioxide; C005023:fulvic acid
keywords: Chlorine; Chlorine dioxide; Drinking water treatment; Natural organic matter; Ozone