The role of aromatic precursors in the formation of haloacetamides by chloramination of dissolved organic matter

Handle URI:
http://hdl.handle.net/10754/581473
Title:
The role of aromatic precursors in the formation of haloacetamides by chloramination of dissolved organic matter
Authors:
Le Roux, Julien ( 0000-0003-0245-8536 ) ; Nihemaiti, Maolida; Croue, Jean-Philippe
Abstract:
Water 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.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Citation:
The role of aromatic precursors in the formation of haloacetamides by chloramination of dissolved organic matter 2015 Water Research
Publisher:
Elsevier BV
Journal:
Water Research
Issue Date:
21-Oct-2015
DOI:
10.1016/j.watres.2015.10.036
Type:
Article
ISSN:
00431354
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0043135415303018
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorLe Roux, Julienen
dc.contributor.authorNihemaiti, Maolidaen
dc.contributor.authorCroue, Jean-Philippeen
dc.date.accessioned2015-11-01T11:05:10Zen
dc.date.available2015-11-01T11:05:10Zen
dc.date.issued2015-10-21en
dc.identifier.citationThe role of aromatic precursors in the formation of haloacetamides by chloramination of dissolved organic matter 2015 Water Researchen
dc.identifier.issn00431354en
dc.identifier.doi10.1016/j.watres.2015.10.036en
dc.identifier.urihttp://hdl.handle.net/10754/581473en
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.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0043135415303018en
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.2015.10.036en
dc.subjectChloraminationen
dc.subjectdisinfection byproductsen
dc.subjecthaloacetamidesen
dc.subjectdissolved organic matteren
dc.subjectaromatic compoundsen
dc.titleThe role of aromatic precursors in the formation of haloacetamides by chloramination of dissolved organic matteren
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalWater Researchen
dc.eprint.versionPost-printen
dc.contributor.institutionCurtin Water Quality Research Centre, Department of Chemistry, Curtin University, GPO Box U1987, Perth WA 6845en
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorLe Roux, Julienen
kaust.authorNihemaiti, Maolidaen
kaust.authorCroue, Jean-Philippeen
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