致密型纳滤膜用于微污染地表水深度处理的中试研究  

Pilot study for the treatment of micro-polluted surface water by a tight nanofiltration membrane system

作　　者：王源 刘丹阳 仲丽娟 WANG Yuan;LIU Danyang;ZHONG Lijuan(Liyuan Water Design&Consultation Co.,Ltd.,Shenzhen 518034,China;School of Environment,Tsinghua University,Beijing 100084,China;Chengdu Xingrong Environment Co.,Ltd.,Chengdu 610041,China)

机构地区：[1]深圳市利源水务设计咨询有限公司,深圳518034 [2]清华大学环境学院,北京100084 [3]成都兴蓉环境股份有限公司,成都610041

出　　处：《给水排水》2023年第1期7-15,共9页Water & Wastewater Engineering

摘　　要：对于微污染原水,常规工艺处理难以满足出厂水水质要求。考察了致密型纳滤中试装置对微污染地表原水进行深度处理的效果,探索了膜污染机制,优化了膜污染的化学清洗方法。中试结果表明,致密型纳滤系统能高效去除无机盐离子和溶解性有机物,其TOC去除率可达94%,出水电导率降低87%。膜污染主要由无机结垢和有机污染组成,前者主要成分为碳酸钙,后者为多糖和蛋白质。对化学清洗方法的优化结果表明,盐酸(pH=2)结合EDTA(pH=12,5 mmol/L)清洗可以有效恢复膜通量至初始水平。该中试装置运行成本为0.63元/m^(3),建议在实际运行中,可将膜过滤出水和常规工艺出水进行混合作为供水,以达到降低运行成本且保证供水水质的目的。Micro-polluted source water treated by conventional processes are difficult to meet the supply standard. Based on this, we studied the effect of a pilot-scale nanofiltration device to treat micro-polluted source water using the tight nanofiltration membrane. The membrane fouling mechanism and chemical cleaning processes were also investigated. This nanofiltration system effectively removed inorganic ions and dissolved organic matter with the average conductivity and TOC rejections of 87% and 94%, respectively. Membrane fouling was dominated by calcium carbonate, polysaccharide and protein, which was effectively relieved by chemical cleaning with hydrochloric acid of pH 2 and 5 mmol/L EDTA of pH 12. The operating cost of the pilot-scale system is 0.63 yuan/m^(3). To reduce the operating cost and meanwhile meet the water supply standard, we suggested to mix the finished waters by tight nanofiltration and conventional processes for water supply in practice.

关 键 词：微污染原水 纳滤膜 膜污染 化学清洗 

分 类 号：TU991[建筑科学—市政工程]