State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
Environ Pollut. 2023 Oct 15;335:122227. doi: 10.1016/j.envpol.2023.122227. Epub 2023 Jul 19.
Ensuring effective drinking water disinfection, remaining a certain amount of residual chlorine, and controlling disinfection by-product formation were very important for guarantying water quality safety and protecting public health; thus, the chlorine decay model and corresponding disinfection by-product formation model were necessary. This paper proposed a mixed-order chlorine bulk decay model (two parameters) based on Taylor's formula and derived its analytical solution. The accuracy of the mixed-order model was evaluated by comparing it with the nth-order model. To optimize the model and reduce the number of parameters required to be calibrated, the relationship of parameters with temperature, initial chlorine concentration, TOC and inorganic substance (ammonia nitrogen and iodide ion) was explored. The result proved that one of the parameters could be regarded as temperature dependent only. Meanwhile, the temperature equation of the model parameters was established by the Arrhenius formula. Subsequently, this paper selected trihalomethane as the target and study the linear relationship between chlorine consumption and trihalomethane formation. The results indicated that the liner slope had little correlation with initial chlorine concentration and temperature. On this basis, the corresponding trihalomethane model was built and its performance was proven to be good. The modeling developed in this work could be applied to drinking water distribution systems for residual chlorine and trihalomethane prediction, and provided a reference for the decision involving water quality.
确保有效的饮用水消毒，保持一定量的余氯，并控制消毒副产物的形成，对于保证水质安全和保护公众健康非常重要；因此，需要建立氯衰减模型和相应的消毒副产物形成模型。本文提出了一种基于泰勒公式的混合阶氯整体衰减模型（两个参数），并推导出了其解析解。通过与 n 阶模型进行比较，评估了混合阶模型的准确性。为了优化模型并减少需要校准的参数数量，研究了参数与温度、初始氯浓度、TOC 和无机物（氨氮和碘离子）之间的关系。结果表明，其中一个参数可以仅视为温度相关。同时，通过阿累尼乌斯公式建立了模型参数的温度方程。随后，本文选择三卤甲烷作为目标，研究了氯消耗与三卤甲烷生成之间的线性关系。结果表明，线性斜率与初始氯浓度和温度几乎没有相关性。在此基础上，建立了相应的三卤甲烷模型，并证明其性能良好。本研究开发的建模方法可应用于饮用水分配系统中余氯和三卤甲烷的预测，为涉及水质的决策提供参考。
