自由氯维护消毒措施抑制管道耗氯作用效果研究

Effect of Free Chlorine Maintenance Disinfection on Controlling Pipelineinduced ChlorineConsumption

管网水余氯浓度快速衰减会严重威胁饮用水水质安全。采用管道反应中试装置,在不同流速下对自由氯维护消毒控制措施的应用效果进行了研究,并借助一级反应动力学模型与自主开发的总氯胺衰减模型(RTCDM)对该措施抑制余氯衰减的机理进行了分析。自由氯维护消毒能够有效降低管壁反应活性,抑制管壁耗氯作用,并且该措施在自由氯消毒阶段的药剂成本较常规氯胺消毒方法降低约26.2%,是一种可行的余氯衰减控制手段。

The rapid decay of residual chlorine in pipe network water has posed significantly threat to the safety of drinking water quality.This paper investigated the performance of free chlorine maintenance disinfection to control chlorine decay at different flow rates in a pilot-scale pipeline reactor.and analyzed the mechanism of this measure to inhibit residual chlorine decay by means of first-order kinetics model and self-developed refined total chloramine decay model(RTCDM).Free chlorine maintenance disinfection effectively reduced the reaction activity of pipe wall,and then inhibited the chlorine consumption of pipe wall.In addition,the chemical cost of this measure at the phase of free chlorine disinfection was approximately 26.2%lower than that of the conventional chloramine disinfection method,indicating that it was a feasible method for controlling residual chlorine decay.