氯胺给水系统管网水余氯衰减控制策略分析

Analysis on the strategy on controlling chlorine residual decay in pipeline water for the chloraminated water supply system

针对氯胺消毒供水系统,分析了氯胺消毒工艺的产生背景、应用情况。根据实际应用效果,发现管网发生硝化反应与亚硝胺类消毒副产物产生是氯胺消毒所面临的现实困境。进一步针对管网水余氯浓度合理管控,从水厂控制手段与管网控制手段两方面综述了目前常用的管网水余氯衰减控制策略,并结合美国派内拉斯县实践经验,论述了管网水余氯浓度维持的成套处理措施。最后,指出未来需要对消毒剂调整的影响作用进行重点关注。

The background and application of chloramine disinfection process was analyzed for the chloraminated water supply system.Based on the application efficacy,it was found the nitrification and nitrosamine disinfection byproduct(DBP)production were the two main problems encountered by the chloramine disinfection.Further,to regulate the chlorine residual of pipeline water reasonably,different strategies on controlling chlorine residual decay were reviewed in detail from the perspective of treatment plant and distribution network,respectively.With the case of water supply utilities of Pinellas County,USA,the package of strategies on maintaining chlorine residual in the pipeline water was discussed.Finally,it was pointed that the effects induced by the disinfectant modification should be focused on specially.