A Kinetic Model of Chlorine Decay Reacting with Organics in Water Distribution Systems
配水管网中与有机物反应的余氯衰减动力学模型

A combined first and second order model was developed to describe the bulk decay of chlorine in water distribution systems. The parameters of model were determined by deriving the best fit with a lot of experimental data. The complex relationships between bulk decay and the temperature, the initial chlorine concentration and TOC were quantificationally described in the model. Except for the initial stages the combined model can be simplified into the first order model and these relationships can be simplified into a linear increase with TOC, a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explained why chlorine decays more rapidly in the initial stages. The accuracy of model was verified by using the experimental data. The results showed that the combined model has better agreement with the experimental data than the conventional first order model.