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Impact of persulfate and ultraviolet light activated persulfate pre-oxidation on the formation of trihalomethanes, haloacetonitriles and halonitromethanes from the chlor(am)ination of three antibiotic chloramphenicols.

Chu, W, Tengfei, C, Bond, TG, Du, E, Yingqing, G and Naiyun, G (2016) Impact of persulfate and ultraviolet light activated persulfate pre-oxidation on the formation of trihalomethanes, haloacetonitriles and halonitromethanes from the chlor(am)ination of three antibiotic chloramphenicols. Water Research, 93. pp. 48-55.

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Abstract

Persulfate oxidation processes, with and without activation using ultraviolet light (respectively UV/PS and PS) have the potential to degrade anthropogenic chemicals in water. However, little is known about the impact of PS or UV/PS pre-oxidation on downstream formation of disinfection by-products (DBPs). In this study the three antibiotic chloramphenicols (chloramphenicol and two of its analogues [thiamphenicol and florfenicol], referred to collectively as CAPs), which frequently occur in wastewater-impacted source waters used by drinking water treatment plants, were selected as model antibiotic compounds. The formation of carbonaceous and nitrogenous disinfection by-products, including halomethanes, haloacetonitriles and halonitromethanes, during chlorination and chloramination preceded by PS and UV/PS was investigated. No significant concentrations of haloacetonitriles and halonitromethanes were detected during chlorination. During chloramination chloramphenicol formed a considerable amount of dichloronitromethane (e.g., 3.44±0.33% mol/mol at NH 2 Cl dose =1 mM) and trichloronitromethane (e.g., 0.79±0.07% mol/mol at NH 2 Cl dose =1 mM), compared with THM and HAN formation. PS pre-oxidation achieved a statistically significant reduction in trichloromethane formation from chlorination, and in HAN and HNM formation from chloramination. Although UV/PS slightly increased dichloroacetonitrile formation during chloramination, it significantly decreased dichloronitromethane and trichloronitromethane formation during chloramination. Overall, the use of PS and UV/PS has the potential to have contrasting impacts on DBP formation in heavily wastewater-impacted waters, depending on the disinfection method. Hence, their application needs to be carefully balanced against the downstream effect on DBP formation.

Item Type: Article
Subjects : Civil & Environmental Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
AuthorsEmailORCID
Chu, WUNSPECIFIEDUNSPECIFIED
Tengfei, CUNSPECIFIEDUNSPECIFIED
Bond, TGUNSPECIFIEDUNSPECIFIED
Du, EUNSPECIFIEDUNSPECIFIED
Yingqing, GUNSPECIFIEDUNSPECIFIED
Naiyun, GUNSPECIFIEDUNSPECIFIED
Date : 11 February 2016
Identification Number : https://doi.org/10.1016/j.watres.2016.02.013
Copyright Disclaimer : © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Chloramphenicols; Trihalomethanes; Haloacetonitriles; Halonitromethanes; Ultraviolet/persulfate
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 14 Mar 2017 16:31
Last Modified : 17 Mar 2017 14:59
URI: http://epubs.surrey.ac.uk/id/eprint/813773

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