Disinfection Model Based on Excess Inactivation Sites: Implications for Linear Disinfection Curves and the Chick-Watson Dilution Coefficient
- 28 September 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 44 (21), 8162-8168
- https://doi.org/10.1021/es101818z
Abstract
Current disinfection models generally are either empirical modifications of Chick’s law (linear survivor curves) or hit or site models modified from the radiation literature. In this paper, a general disinfection model is developed that assumes a large number of inactivation sites. From a probabilistic model of damaged site distribution, the normalized number of surviving organisms is described as the cumulative distribution function (cdf) of the normal distribution, with the independent variable equal to a measure of damage and the mean and variance equal and determined by dose−response submodels. Submodels were developed for chemical disinfectants without disinfectant demand, ultraviolet radiation, and chemical disinfectants with first-order disinfectant demand. This infinite site model reproduces linear, shouldering, and tailing survivor curves from literature data. In addition, it predicts Chick-Watson dilution coefficients in the range observed in the literature. The infinite site model offers the interpretation that linear, shoulder, tailing, and biphasic survivor curves and the apparent Chick-Watson dilution coefficient are ramifications of the normal cdf, rather than mechanistic laws.Keywords
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