饮用水分配系统中氯消散的经验模型已经建立 随着管道材料和水质的变化而发展。聚氯乙烯（PVC）、镀锌钢、， 无内衬铸铁管和内衬球墨铸铁管取自实际分配系统 并用于建造18个试点分配系统（PDS），该系统已完工 水先导分配系统的运行模拟正常运行 情况。使用泵将水力停留时间调节至5天。 自由的 研究中使用了氯和一氯胺。对PDS进行了监测 时间、温度、pH值和总有机碳。免费和全包的单独型号 氯的衰变已经发展起来。 一级动力学模型准确地描述了游离氯和复合氯的衰变。速度 常数取决于管道材料、UV-254和温度。速率常数 采用非线性回归法，按物质、游离氯和总氯进行了回归分析。自由的 在PVC和内衬球墨铸铁管中，氯的复合衰变是相似的，并且 速度明显低于镀锌和无衬里铸铁管。因此，表面 水相消毒剂的反应比消毒剂更显著 与水相溶质的反应。敏感性分析表明，消毒剂 法规要求的残差在夏季条件下很难实现 无衬里金属管。包括14个参考文献、表格和图表。

Empirical models for chlorine dissipation in drinking water distribution systems have been developed as a function of pipe material and water quality. Polyvinyl chloride (PVC), galvanized steel, unlined cast iron and lined ductile iron pipes were taken from actual distribution systems and used to build eighteen pilot distribution systems (PDSs), which received finished water. Operation of the pilot distribution systems simulated normal operation circumstances. Hydraulic retention time was regulated using pumps to 5 days. Free chlorine and monochloramines were used in the study. The PDSs were monitored for time, temperature, pH, and total organic carbon. Separate models for free and total chlorine decay were developed. First-order kinetic models accurately described free and combined chlorine decay. Rate constants were dependent on pipe material, UV-254 and temperature. Rate constants were developed by material and free and total chlorine using non-linear regression. Free and combined chlorine decay was similar in PVC and lined ductile iron pipes, and was significantly less rapid than in galvanized and unlined cast iron pipes. Hence, surface reactions with the aqueous phase disinfectant were more significant than disinfectant reactions with the aqueous phase solutes. Sensitivity analyses indicated that disinfectant residuals required by regulation were difficult to achieve in summertime conditions for unlined metallic pipes. Includes 14 references, tables, figures.