微滤膜处理铁污染地下水的效果及膜污染控制研究  

Microfiltration for Treatment of Iron Contaminated Underground Water and Membrane Fouling Countermeasures

作　　者：李荧 程家迪 刘锐 蔡强 李伟 陈吕军[1,3] 

机构地区：[1]浙江清华长三角研究院生态环境研究所,浙江嘉兴314006 [2]浙江双益环保科技发展有限公司,浙江嘉兴314006 [3]清华大学环境科学与工程系,北京100084

出　　处：《中国给水排水》2010年第1期36-39,共4页China Water & Wastewater

基　　金：浙江省重大专项(2006C13107);南湖区大院名校成果产业专项资金资助项目

摘　　要：采用新型超高分子质量聚乙烯管式微滤膜为过滤介质,研究了微滤和曝气氧化/微滤组合工艺处理铁污染地下水的效果及机理。运行初始,微滤对铁的去除率为50%左右,曝气氧化/微滤组合工艺对铁的去除率可达90%以上,比单独微滤提高了40%～60%;运行后期管式膜表面生成铁质活性滤膜,单独微滤对铁的去除率也能达到90%以上。在前期膜污染以铁等无机物污染为主,后期为铁质活性滤膜和滤饼层污染。大流量水力冲洗和稀HC l浸泡可有效去除膜污染,NaC lO碱洗对膜过滤性能的恢复作用较小。A tubular membrane made from ultrahigh molecular weight polyethylene was used to treat iron-contaminated underground water. The treatment performance of two operation modes, microfiltration （MF） and aerated oxidation/MF, was compared. At the initial stage, the iron removal rate is a- bout 50% by MF and more than 90% by aerated oxidation/MF. The iron removal rate by aerated oxida- tion/MF is 40% to 60% higher than that by MF. At the late stage, a ferruginous activated biofilm is formed over the membrane surface, and the iron removal rate by MF reaches over 90%. Inorganic matters such as Fe are the main contributors to membrane fouling at the beginning, but ferruginous activated biofilm and cake layer take over towards the end of the experiment. The membrane foulants can be effectively removed by hydraulic flushing combined with dilute HCl solution. Washing with NaCIO solution has little effect on recovering membrane filtration flux.

关 键 词：曝气氧化 微滤 地下水 铁质活性滤膜 膜污染 

分 类 号：X523[环境科学与工程—环境工程]