低pH低碱度水源水引起供水管网黄水的控制措施  

Control Measures for Red Water Problem Caused by Low pH and Low Alkalinity Source Water in Drinking Water Distribution Systems

作　　者：米子龙[1] 邬慧婷[1] 张晓健[1] 陈超[1] 李越[2] 

机构地区：[1]清华大学环境学院,北京100084 [2]清华大学深圳研究生院,广东深圳518055

出　　处：《中国给水排水》2014年第18期23-27,共5页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07404-002)

摘　　要：针对我国南方水源水低pH值、低碱度水质特征引起供水管网"黄水"问题的控制技术开展了系统研究,确定了管网水pH调节技术和余氯保持技术为经济可行的控制措施。研究结果表明,提高管网水pH值对铁释放具有明显的控制作用,且总铁释放量与pH值呈现出显著负相关性。采用Ca(OH)2调节管网水pH值对铁释放的控制效果略优于NaOH,分析原因是投加Ca(OH)2在提高管网水pH值的同时增加了管网水的硬度,有利于管垢稳定性。保持管网水较高的余氯浓度对管网铁释放具有一定的控制作用。The control technologies for red water problem caused by the low pH and low alkalinity source water in drinking water distribution systems in South China were investigated, and it was proposed that pH adjustment and maintaining chlorine residual were the cost-effective control measures. The results showed that increasing pH could effectively restrain iron release, and the total iron concentrations had an obvious negative correlation with the pH values. The controlling effect of increasing pH by Ca（OH） 2 was better than using NaOH, the reason for that was the addition of Ca（OH）2 could elevate the hardness of pipe water accompanied by increasing pH and was better for iron scale stability. Besides, maintaining higher concentration of chlorine residual could inhibit the iron release in drinking water distribution systems.

关 键 词：供水管网 黄水控制 pH值调节 CA(OH)2 NAOH 余氯 

分 类 号：TU991.33[建筑科学—市政工程]