Abstract
The goal of drinking water chlorination is the inactivation of pathogenic organisms in water. It offers the advantage of producing residuals useful for the preservation of water quality in a distribution system. Basic key chlorination concepts include chlorine demand/decay, chlorine residuals, and CT disinfection. The application of these concepts required a good understanding of the hydraulic condition of the system. Important consideration is the determination of initial required chlorine dose. A demonstration model using a public school water supply scheme with an overhead tank is done. This incorporates the kinematic of Contact Time (CT) disinfection, and the application of a demand model for the determination of initial chlorine concentration/dose required. Optimal application of chlorine will prevent incidences of either an over-dose or under-doze which highlight the importance of this study. Keywords— chlorine demand, CT Disinfection, initial chlorine concentration, log removal value, residual concentration.
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