Simulation of Chlorine Decay in Drinking Water Distribution Systems

Abstract

This work presents a model that evaluates the decay of the chlorine concentration in drinking water distribution networks. The model may use either Lagrangian based time driven or event driven methods depending on the hydraulic characteristic of the pipes. The decay of the chlorine within a pipe is evaluated by using a single equation that incorporates the bulk decay, radial diffusion and subsequent pipe-wall reaction of chlorine. The equation is embedded into a computer program called DYNAQ, which can perform dynamic water quality analysis in drinking water distribution networks. The developed model is also applied to an existing water distribution network and the comparison of the model results with a currently available model is presented.