配水管网中与有机物反应的余氯衰减动力学模型

提出一级二级反应组合动力学模型,用大量实验数据拟合模型中的参数,模拟配水管网系统中余氯衰减的水体消耗部分.该模型定量反应了温度T、初始氯浓度c₀和TOC与余氯衰减之间的复杂关系.除初始阶段外,组合模型可简化为一级反应模型;T、TOC和c₀与余氯衰减之间的关系分别可简化为指数关系、正线性关系和负线性关系.该模型较好地解释了余氯衰减在初始阶段进行相对较快这一现象.实验数据验证的结果表明:该组合模型与实验数据吻合良好,优于传统的一级反应模型.

A Kinetic Model of Chlorine Decay Reacting with Organics in Water Distribution Systems

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.