水源切换引发供水管网腐蚀产物释放的控制对策  

Control of Release of Corrosion Products Caused by Water Source Switch in Drinking Water Distribution Systems

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

机构地区：[1]清华大学环境学院,北京100084

出　　处：《中国给水排水》2013年第22期44-48,共5页China Water & Wastewater

基　　金：国家高技术研究发展计划(863)项目(2009AA06Z308);国际科技交流与合作专项(2010DFA91830);国家水体污染控制与治理科技重大专项(2012ZX07404-002)

摘　　要：水源切换将造成原水水质化学组分突变，易引发供水管网腐蚀产物的过量释放，严重时会发生“黄水”问题。为保障水源切换后供水管网水质稳定性，定量研究了水源调配技术、调节pH值技术和投加缓蚀剂技术对管网铁释放的控制效果。研究表明，不同水源勾兑使用、提高管网水pH值和投加六偏磷酸盐均可使管网铁释放量明显降低。由此确定了应对高硫酸盐水源切换后管网铁释放的控制对策：控制管网水硫酸根浓度〈75mg／L；将管网水pH值由7．8调高至8．3，必要时调至8．8；投加0．3～0．5mg／L（以P计）的六偏磷酸盐缓蚀剂。The source water quality change caused by water source switch would possibty lead to serious iron release phenomenon and red water problem in drinking water distribution systems. In order to maintain the water quality stability, the controlling effects of blending water sources, adjusting pH and adding inhibitor on iron release were investigated. It was found that the iron release decreased significant- ly with blending source water, increasing pH and adding hexametaphosphate. Meanwhile, the control technologies for iron release caused by high concentrations of sulphate in new source water were estab- lished, including that the sulphate concentration needed to be less than 75 mg/L, the pH was elevated from 7.8 to 8.3, even to 8.8 if necessary, and 0.3 mg/L to 0.5 mg/L （ calculated by P） hexametaphos- phate inhibitor could be added in water distribution systems.

关 键 词：水源切换 管网腐蚀 铁释放 控制技术 “黄水”现象 

分 类 号：TU991[建筑科学—市政工程]