净水技术2025，Vol.44Issue(1)：55-64,73,11.DOI:10.15890/j.cnki.jsjs.2025.01.007
用于饮用水处理的高脱盐率商品纳滤膜性能试验
Experimental Performance of Commercial Nanofiltration Membranes with High Desalinization Rate for Drinking Water Treatment
摘要
Abstract
[Objective]In some cities of the north China,municipal drinking water sources are composed of water from South-to-North water diversion project and local water sources,and there are significant differences in water quality between them.Municipal water supply faces the problem of"different quality in the same city".[Methods]The performance of six kinds of commercial nanofiltration membranes with high desalination rate used for raw water treatment in some areas of north China was studied in this experiment.The physical and chemical properties of six nanofiltration membranes,including surface morphology,functional groups,elemental composition,roughness,hydrophilicity and surface electricity,were characterized and studied in detail.At the same time,the filtration performance of six kinds of nanofiltration membranes was investigated by membrane filtration test,including the permeability of pure water,the retention of organic matters and inorganic salts,and the performance under simulated raw water filtration conditions.[Results]The results showed that the pure water permeability coefficients of the six nanofiltration membranes were 12～16 L/(m2·h·bar)(1 bar=0.1 MPa),which were mainly affected by the surface roughness,hydrophilicity and pore size distribution of membranes.The retention rates of fully aromatic polyamide nanofiltration membranes for various inorganic salts were more than 90％.The retention rates of semi-aromatic polyamide nanofiltration membranes for sodium chloride were about 40％,while the retention rates for other inorganic salts were also more than 90％.All the six selected nanofiltration membranes exhibited a retention rates over 70％for organic matter and that over 90％for hardness.However,due to the differences in membrane pore size and surface charge,the retention rates of sulfate and chloride salts were different among the membranes.The denser active layer and more surface negative charges could make the chloride retention rates of the membranes meet the requirements.[Conclusion]Higher roughness,lower crosslinking degree and stronger hydrophilicity are beneficial to improve the water permeability of all aromatic polyamide nanofiltration membranes.The small and concentrated pore size of nanofiltration membrane is conducive to the removal of hardness and sulfate.关键词
市政供水/纳滤/高硬度水/无机盐/截留率Key words
municipal water supply/nanofiltration(NF)/high hardness water/inorganic salt/retention rate分类
土木建筑引用本文复制引用
章中,段冬,刘彦伶,夏圣骥..用于饮用水处理的高脱盐率商品纳滤膜性能试验[J].净水技术,2025,44(1):55-64,73,11.基金项目
国家自然科学基金项目(52170010) （52170010）
南宁市科学研究与技术开发计划:水厂提质节能型工艺关键技术研究与示范(ZC20223238) （ZC20223238）
