纳滤和电渗析对浓海水一二价离子的分离性能  

Nanofiltration and Electrodialysis on Separation of Monovalent and Divalent Ions from Concentrated Seawater

作　　者：陈静[1] 张杰[1] 金艳[1] 孙玉柱[1] 宋兴福[1] 于建国[1] 

机构地区：[1]华东理工大学国家盐湖资源综合利用工程技术研究中心,上海200237

出　　处：《过程工程学报》2017年第3期491-499,共9页The Chinese Journal of Process Engineering

基　　金：国家科技支撑项目(编号:2015BAB10B01);国家重点研发计划(编号:2016YFC0401203)

摘　　要：采用纳滤及一价选择性离子交换膜电渗析2种方法对模拟浓海水进行分离浓缩,探索一、二价离子(Na^+/Mg^(2+),Cl^-/SO_4^(2-))的分离效果.实验表明,DL2540膜对二价离子的截留性能优于NF270膜,在2.1 MPa压力、浓侧流量为300 L/h的条件下,对Mg^(2+)和SO_4^(2-)的截留率分别达98.1%和80.5%,分离因子为2.5和40.0.一价离子选择性电渗析膜对阴离子Cl^-和SO_4^(2-)的分离效果明显好于阳离子Na^+和Mg^(2+),Na+回收率为90%时,选择性迁移比分别为18.4和2.9.纳滤和选择性电渗析对一、二价离子都有较好的分离效果,电渗析离子分离的同时可实现浓缩,而纳滤对一价离子几乎无浓缩效果.Electrodialysis （ED） and nanofiltration （NF） were adopted to separate monovalent and divalent ions （Na＋/Mg2＋, C1-/SO42-）. The results showed that DL2540 had a better separation efficiency for the rejection of divalent ions than NF270. The rejection of Mg2＋ and SO42- were 98.1% and 80.5%, respectively. For ED, the separation factors were 2.5 and 40.0. The separation performance of Cl-/SO42- was better than that of Na＋/Mg2＋, the separation factors were 18.4 and 2.9 under 90% recover rate of Na＋. Both methods had good separation effects of monovalent and divalent ions. ED could also realize ions concentration, while NF could not.

关 键 词：浓海水 电渗析 纳滤 一二价离子分离 

分 类 号：TQ085[化学工程]