Using a comprehensive model to identify the major mechanisms of chloramine decay in distribution systems

J. Woolschlager, B. Rittmann, P. Piriou, L. Kiene, B. Schwartz

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The principle mechanisms of chloramine residual decay in drinking water distribution systems is examined using a comprehensive model of chloramine reactions calibrated to distribution system data. The results reveal that four principle chloramine decay mechanisms must be considered, including: reactions with hypochlorous acid/ion (HOCl/OCl-); an auto- catalytic reaction in which chloramines spontaneously decay in the absence of other reactants; oxidation reactions with reduced forms of organics and iron; and biologically-catalyzed reactions, such as the reactions with nitrite produced by nitrifiers as well as the direct cometabolism of chloramines by nitrifiers. The chloramine reaction model fits the distribution system data best when all of these reactions, including cometabolism of chloramines by nitrifiers, are included in the model.

Original languageEnglish (US)
Pages (from-to)103-110
Number of pages8
JournalWater Science and Technology: Water Supply
Volume1
Issue number4
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Chloramine residual
  • Disinfection
  • Distribution systems
  • Modeling
  • Nitrification
  • Water quality

ASJC Scopus subject areas

  • Water Science and Technology

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