Developing an effective strategy to control nitrifier growth using the Comprehensive Disinfection and Water Quality model (CDWQ)

John E. Woolschlager, Bruce E. Rittmann, Philippe Piriou, Barry Schwartz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Nitrifier growth is a common problem in drinking water distribution systems where chloramines are used for disinfection. Nitrifier growth in distribution systems is supported by five principle mechanisms that supply ammonia as an initial substrate: (1) excess ammonia remaining from chloramine formation reactions; (2) autocatalytic decay of chloramines; (3) oxidation of organic matter by chloramines; (4) chloramine reactions with nitrite; (5) chloramine reactions with pipe surfaces. The Comprehensive Disinfection and Water Quality (CDWQ) model is a dynamic water-quality model that was developed to account for these ammonia-producing reactions and the dynamics of suspended and fixed bacteria, including nitrifiers, in full-scale distribution systems. The results of this study show that increasing chloramine levels to disinfect nitrifiers is ineffective. The ammonia released through chloramine decay reactions fuels nitrifier growth, outpacing chloramine disinfection dynamics. The only effective strategy to limit nitrifier growth is to reduce substrate availability by increasing the initial chlorine-to-nitrogen ratio used to form chloramines and the use of booster disinfection. Copyright ASCE 2004.

Original languageEnglish (US)
Title of host publicationBridging the Gap
Subtitle of host publicationMeeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
DOIs
StatePublished - Dec 1 2004
Externally publishedYes
EventWorld Water and Environmental Resources Congress 2001 - Orlando, FL, United States
Duration: May 20 2001May 24 2001

Publication series

NameBridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
Volume111

Other

OtherWorld Water and Environmental Resources Congress 2001
CountryUnited States
CityOrlando, FL
Period5/20/015/24/01

ASJC Scopus subject areas

  • Water Science and Technology

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