Ct (disinfectant concentration multiplied by exposure time) values for chlorine are used by the US EPA to evaluate the efficacy of disinfection of microorganisms under various drinking water treatment conditions. These Ct values are generally derived from laboratory studies in which chlorine decay is characterized by a first order decay model. The concentration of chlorine is often only measured at the initial and final exposure times. In this study, using bacterial spore inactivation data where residual chlorine was measured at least twice in between initial and final exposure times, chlorine decay models were evaluated to determine the effect on Ct calculations. Traditionally Ct is treated as a constant in estimating the rate constant of the simple Chick-Watson inactivation kinetics model. As Ct is estimated it is subject to estimation error. To account for this error, the parameters of the chlorine decay and the inactivation models were estimated simultaneously.
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May 2008
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
May 01 2008
The effect of chlorine demand on estimation of the inactivation rate constant
M. Sivaganesan;
1US Environmental Protection Agency, 26 W. Martin Luther King Drive, Cincinnati, OH 45268, USA
Phone: (513)569-7118 Fax: (513)569-7658; E-mail: [email protected]
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E. W. Rice;
E. W. Rice
1US Environmental Protection Agency, 26 W. Martin Luther King Drive, Cincinnati, OH 45268, USA
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N. J. Adcock
N. J. Adcock
1US Environmental Protection Agency, 26 W. Martin Luther King Drive, Cincinnati, OH 45268, USA
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Journal of Water Supply: Research and Technology-Aqua (2008) 57 (3): 165–170.
Article history
Received:
June 28 2007
Accepted:
September 19 2007
Citation
M. Sivaganesan, E. W. Rice, N. J. Adcock; The effect of chlorine demand on estimation of the inactivation rate constant. Journal of Water Supply: Research and Technology-Aqua 1 May 2008; 57 (3): 165–170. doi: https://doi.org/10.2166/aqua.2008.037
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