淡化海水并网供水的管网铁释放控制技术研究  

Controlling Iron Release in Drinking Water Distribution System Fed with Desalinated Seawater

作　　者：米子龙[1] 张晓健[1] 陈超[1] 陈沛君[2] 杜嘉丹[2] 

机构地区：[1]清华大学环境学院,北京100084 [2]山东大学环境科学与工程学院,山东济南250100

出　　处：《中国给水排水》2012年第19期37-40,共4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项目(2010DFA91830)

摘　　要：淡化海水由于具有较强的侵蚀性,并网供水后会对既有供水管网造成严重的铁释放现象和黄水问题。为了有效地控制管网铁释放,利用管段模拟反应器,定量研究了调节pH值、碱度、硬度和投加缓蚀剂对管网铁释放的控制效果。研究发现,提高pH值、增加碱度和硬度、投加磷酸盐缓蚀剂均可使淡化海水并网供水后造成的管网铁释放量明显降低。由此初步确定了控制淡化海水进入供水管网造成铁过量释放所需满足的水质条件为:管网水的pH值在7.70以上,碱度>80 mg/L,硬度>80 mg/L;必要时可选择投加0.25～0.50 mg/L的聚磷酸盐缓蚀剂。Desalinated seawater, with strong corrosiveness, would possibly lead to serious iron release phenomenon and ＂red water＂ problem when fed into municipal drinking water distribution systems. To control iron release in the drinking water distribution system, the effect of adjusting pH, alkalinity, hardness and adding inhibitor were investigated in pipe section reactors which were designed to simulate pipe network conditions. The results found that the iron release decreased significantly as increasing pH, alkalinity, hardness and adding polyphosphate inhibitor. Meanwhile, the necessary water quality conditions for controlling iron release were established. The iron control criteria specify that pH, alkalinity and hardness should be more than 7.70, 80 mg/L and 80 mg/L respectively. 0.25 to O. 50 mg/L of polyphosphate inhibitor should be added if necessary.

关 键 词：淡化海水 给水管网 铁释放 水质调节 后处理 

分 类 号：TU991.33[建筑科学—市政工程]