Formation of CNBr in O3/NH2Cl sequential disinfection

Hongxia Lei; Roger A. Minear; Benito J. Mariñas

Formation of CNBr in O₃/NH₂Cl sequential disinfection

Hongxia Lei, Roger A. Minear, Benito J. Mariñas

Research output: Contribution to journal › Article › peer-review

Abstract

The formation of CNBr appears to be a complex reaction in sequential disinfection treatment of drinking water with O₃ and NH₂Cl. Many parallel and cross-linked pathways may lead to the formation of CNBr. In simplified system containing HCHO, NH₂Cl and Br the formations of CNBr and CNCl are competitive processes. High Br favors the formation of CNBr through reactions between HCHO and bromamines, CN^- and bromamines, CN^- and HOBr. NHClBr may also react with HCHO, in a similar way NHBr₂ does, to form CNBr. Hydrolysis reactions in the pH range of 6 to 8 used in this study were found to be negligible over 24 hours period.

Original language	English (US)
Pages (from-to)	82-84
Number of pages	3
Journal	ACS Division of Environmental Chemistry, Preprints
Volume	40
Issue number	2
State	Published - Aug 20 2000

Keywords

Cyanogen bromide
DBPs
Formaldehyde
Kinetics
Monochloramine
Ozone

ASJC Scopus subject areas

Chemical Engineering(all)

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Cite this

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title = "Formation of CNBr in O3/NH2Cl sequential disinfection",

abstract = "The formation of CNBr appears to be a complex reaction in sequential disinfection treatment of drinking water with O3 and NH2Cl. Many parallel and cross-linked pathways may lead to the formation of CNBr. In simplified system containing HCHO, NH2Cl and Br the formations of CNBr and CNCl are competitive processes. High Br favors the formation of CNBr through reactions between HCHO and bromamines, CN- and bromamines, CN- and HOBr. NHClBr may also react with HCHO, in a similar way NHBr2 does, to form CNBr. Hydrolysis reactions in the pH range of 6 to 8 used in this study were found to be negligible over 24 hours period.",

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AU - Lei, Hongxia

AU - Minear, Roger A.

AU - Mariñas, Benito J.

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N2 - The formation of CNBr appears to be a complex reaction in sequential disinfection treatment of drinking water with O3 and NH2Cl. Many parallel and cross-linked pathways may lead to the formation of CNBr. In simplified system containing HCHO, NH2Cl and Br the formations of CNBr and CNCl are competitive processes. High Br favors the formation of CNBr through reactions between HCHO and bromamines, CN- and bromamines, CN- and HOBr. NHClBr may also react with HCHO, in a similar way NHBr2 does, to form CNBr. Hydrolysis reactions in the pH range of 6 to 8 used in this study were found to be negligible over 24 hours period.

AB - The formation of CNBr appears to be a complex reaction in sequential disinfection treatment of drinking water with O3 and NH2Cl. Many parallel and cross-linked pathways may lead to the formation of CNBr. In simplified system containing HCHO, NH2Cl and Br the formations of CNBr and CNCl are competitive processes. High Br favors the formation of CNBr through reactions between HCHO and bromamines, CN- and bromamines, CN- and HOBr. NHClBr may also react with HCHO, in a similar way NHBr2 does, to form CNBr. Hydrolysis reactions in the pH range of 6 to 8 used in this study were found to be negligible over 24 hours period.

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KW - DBPs

KW - Formaldehyde

KW - Kinetics

KW - Monochloramine

KW - Ozone

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