TY - GEN
T1 - Developing an effective strategy to control nitrifier growth using the Comprehensive Disinfection and Water Quality model (CDWQ)
AU - Woolschlager, John E.
AU - Rittmann, Bruce E.
AU - Piriou, Philippe
AU - Schwartz, Barry
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
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U2 - 10.1061/40569(2001)379
DO - 10.1061/40569(2001)379
M3 - Conference contribution
AN - SCOPUS:75649135932
SN - 0784405697
SN - 9780784405697
T3 - Bridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
BT - Bridging the Gap
T2 - World Water and Environmental Resources Congress 2001
Y2 - 20 May 2001 through 24 May 2001
ER -