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西北地区地下水中普遍存在无机盐含量超标的问题。为经济高效地去除地下水中的无机盐和指导后续工程应用选择膜组件,通过参考该区域水源,配制了多离子超标的试验原水,开展了2种纳滤膜的离子分离特性及产水性能研究,考察了操作压力和进水流量对2种商业纳滤膜脱盐效能的影响。结果表明,在优化条件下(操作压力为0.5 MPa,进水流量为350 L/h),NF270纳滤膜对SO_4~(2-),F~-,Cl~-的去除率为99.42%,81.69%,34.65%,NF90纳滤膜对SO_4~(2-),F~-,Cl~-,NO_3~-的去除率为99.76%,98.16%,96.31%,84.66%。NF270纳滤膜具有更强的离子选择分离特性,更适用于去除水中的二价盐,且产水膜通量更高;而NF90纳滤膜可有效去除水中的硝酸盐。
Northwest groundwater generally exist in the problem of excessive salt content. In order to economically and efficiently remove inorganic salts in groundwater and guide the selection of membrane modules for subsequent application, the experimental raw water with multi-ions exceeded the standard was prepared by referring to the water source in this area, and the ion separation characteristics and water-producing performance of the two nanofiltration membranes were studied , Investigated the impact of operating pressure and influent flow on the desalination performance of two commercial nanofiltration membranes. The results showed that the removal rate of SO_4 ~ (2 -), F ~ -, Cl ~ - by NF270 nanofiltration membrane was 99.42% under the optimal conditions (operating pressure of 0.5 MPa and influent flow rate of 350 L / h) 81.69%, 34.65%. The removal rates of SO_4 ~ (2 -), F ~ -, Cl ~ - and NO_3 ~ by NF90 nanofiltration membrane were 99.76%, 98.16%, 96.31% and 84.66%, respectively. NF270 nanofiltration membrane has more ion selective separation characteristics, more suitable for removal of divalent salts in water, and the production of water flux higher flux; and NF90 nanofiltration membrane can effectively remove nitrate in water.