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⁺/Mg²⁺, Cl^-/SO₄^2-)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Mg²⁺和SO₄^2-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SO₄^2-的分离效果明显好于阳离子Na⁺和Mg²⁺，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⁺, Cl^-/SO₄^2-). The results showed that DL2540 had a better separation efficiency for the rejection of divalent ions than NF270. The rejection of Mg²⁺ and SO₄^2- were 98.1% and 80.5%, respectively. For ED, the separation factors were 2.5 and 40.0. The separation performance of Cl^-/SO₄^2- 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.