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dc.contributor.authorLe Roux, Julien
dc.contributor.authorNihemaiti, Maolida
dc.contributor.authorCroue, Jean-Philippe
dc.date.accessioned2015-11-01T11:05:10Z
dc.date.available2015-11-01T11:05:10Z
dc.date.issued2015-10-24
dc.identifier.citationThe role of aromatic precursors in the formation of haloacetamides by chloramination of dissolved organic matter 2015 Water Research
dc.identifier.issn00431354
dc.identifier.pmid26517788
dc.identifier.doi10.1016/j.watres.2015.10.036
dc.identifier.urihttp://hdl.handle.net/10754/581473
dc.description.abstractWater treatment utilities are diversifying their water sources and often rely on waters enriched in nitrogen-containing compounds (e.g., ammonia, organic nitrogen such as amino acids). The disinfection of waters exhibiting high levels of nitrogen has been associated with the formation of nitrogenous disinfection byproducts (N-DBPs) such as haloacetonitriles (HANs) and haloacetamides (HAcAms). While the potential precursors of HANs have been extensively studied, only few investigations are available regarding the nature of HAcAm precursors. Previous research has suggested that HAcAms are hydrolysis products of HANs. Nevertheless, it has been recently suggested that HAcAms can be formed independently, especially during chloramination of humic substances. When used as a disinfectant, monochloramine can also be a source of nitrogen for N-DBPs. This study investigated the role of aromatic organic matter in the formation of N-DBPs (HAcAms and HANs) upon chloramination. Formation kinetics were performed from various fractions of organic matter isolated from surface waters or treated wastewater effluents. Experiments were conducted with 15N-labeled monochloramine (15NH2Cl) to trace the origin of nitrogen. N-DBP formation showed a two-step profile: (1) a rapid formation following second-order reaction kinetics and incorporating nitrogen atom originating from the organic matrix (e.g., amine groups); and (2) a slower and linear increase correlated with exposure to chloramines, incorporating inorganic nitrogen (15N) from 15NH2Cl into aromatic moieties. Organic matter isolates showing high aromatic character (i.e., high SUVA) exhibited high reactivity characterized by a major incorporation of 15N in N-DBPs. A significantly lower incorporation was observed for low-aromatic-content organic matter. 15N-DCAcAm and 15N-DCAN formations exhibited a linear correlation, suggesting a similar behavior of 15N incorporation as SUVA increases. Chloramination of aromatic model compounds (i.e., phenol and resorcinol) showed higher HAcAm and HAN formation potentials than nitrogenous precursors (i.e., amino acids) usually considered as main precursors of these N-DBPs. These results demonstrate the importance of aromatic organic compounds in the formation of N-DBPs, which is of significant importance for water treatment facilities using chloramines as final disinfectant.
dc.language.isoen
dc.publisherElsevier BV
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0043135415303018
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Water Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Water Research, 21 October 2015. DOI: 10.1016/j.watres.2015.10.036
dc.subjectChloramination
dc.subjectdisinfection byproducts
dc.subjecthaloacetamides
dc.subjectdissolved organic matter
dc.subjectaromatic compounds
dc.titleThe role of aromatic precursors in the formation of haloacetamides by chloramination of dissolved organic matter
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalWater Research
dc.eprint.versionPost-print
dc.contributor.institutionCurtin Water Quality Research Centre, Department of Chemistry, Curtin University, GPO Box U1987, Perth WA 6845
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personLe Roux, Julien
kaust.personNihemaiti, Maolida
kaust.personCroue, Jean-Philippe
refterms.dateFOA2017-10-21T00:00:00Z
dc.date.published-online2015-10-24
dc.date.published-print2016-01


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