Abstract

Nitrogenous disinfection byproducts (N-DBPs) such as haloacetonitriles (HANs) and halonitromethanes (HNMs) are formed during water chlorination. Preozonation is sometimes applied to control trihalomethane (THM) formation, but this may risk promoting the formation of HNMs and HANs. The role of ozone in the formation of HANs and HNMs in natural waters remains unclear. The nitrogen sources involved in HAN and HNM formation during the chloramination of dissolved organic matter (DOM) with and without preozonation were evaluated using 15N-labeled monochloramine. The origin of the nitrogen involved in HAN formation was found to depend on the ratio of dissolved organic carbon to nitrogen. In nitrogen-rich solutions HAN nitrogen was mainly from DOM constituents. The formation of 15N-labeled dichloroacetontrile (DCAN) accounted for approximately 30% of the DCAN produced from all hydrophilic acidic and neutral isolates, which have low carbon to nitrogen ratios, while it reached over 50% for the hydrophobic acidic, basic, and neutral isolates with high carbon to nitrogen ratios. Unlabeled trichloronitromethane (TCNM) accounted for over 90% of the total TCNM produced from most of the isolates. The remaining less than 10% of the TCNM was probably generated through an aldehyde pathway. Preozonation reduced DCAN but enhanced the yield of TCNM. The destruction of amino acids and amine structures and subsequent formation of nitro groups by preozonation may help explain the reduced DCAN and increased TCNM formation.

Original languageEnglish (US)
Pages (from-to)12832-12838
Number of pages7
JournalEnvironmental Science and Technology
Volume46
Issue number23
DOIs
StatePublished - Dec 4 2012

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Ozonization
Chlorine
Water treatment
chlorine
water treatment
Nitrogen
nitrogen
dissolved organic matter
Biological materials
Carbon
Trihalomethanes
Water
Disinfection
Chlorination
Ozone
carbon
aldehyde
chlorination
Organic carbon
ozonation

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Nitrogen origins and the role of ozonation in the formation of haloacetonitriles and halonitromethanes in chlorine water treatment. / Yang, Xin; Shang, Chii; Shen, Qianqian; Chen, Baiyang; Westerhoff, Paul; Peng, Jinfeng; Guo, Wanhong.

In: Environmental Science and Technology, Vol. 46, No. 23, 04.12.2012, p. 12832-12838.

Research output: Contribution to journalArticle

Yang, Xin ; Shang, Chii ; Shen, Qianqian ; Chen, Baiyang ; Westerhoff, Paul ; Peng, Jinfeng ; Guo, Wanhong. / Nitrogen origins and the role of ozonation in the formation of haloacetonitriles and halonitromethanes in chlorine water treatment. In: Environmental Science and Technology. 2012 ; Vol. 46, No. 23. pp. 12832-12838.
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abstract = "Nitrogenous disinfection byproducts (N-DBPs) such as haloacetonitriles (HANs) and halonitromethanes (HNMs) are formed during water chlorination. Preozonation is sometimes applied to control trihalomethane (THM) formation, but this may risk promoting the formation of HNMs and HANs. The role of ozone in the formation of HANs and HNMs in natural waters remains unclear. The nitrogen sources involved in HAN and HNM formation during the chloramination of dissolved organic matter (DOM) with and without preozonation were evaluated using 15N-labeled monochloramine. The origin of the nitrogen involved in HAN formation was found to depend on the ratio of dissolved organic carbon to nitrogen. In nitrogen-rich solutions HAN nitrogen was mainly from DOM constituents. The formation of 15N-labeled dichloroacetontrile (DCAN) accounted for approximately 30{\%} of the DCAN produced from all hydrophilic acidic and neutral isolates, which have low carbon to nitrogen ratios, while it reached over 50{\%} for the hydrophobic acidic, basic, and neutral isolates with high carbon to nitrogen ratios. Unlabeled trichloronitromethane (TCNM) accounted for over 90{\%} of the total TCNM produced from most of the isolates. The remaining less than 10{\%} of the TCNM was probably generated through an aldehyde pathway. Preozonation reduced DCAN but enhanced the yield of TCNM. The destruction of amino acids and amine structures and subsequent formation of nitro groups by preozonation may help explain the reduced DCAN and increased TCNM formation.",
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AU - Yang, Xin

AU - Shang, Chii

AU - Shen, Qianqian

AU - Chen, Baiyang

AU - Westerhoff, Paul

AU - Peng, Jinfeng

AU - Guo, Wanhong

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