邻苯二甲酸氢钾对纳滤膜和反渗透膜分离影响

Effects of Potassium Hydrogen Phthalate on Nanofiltration and Reverse Osmosis Membrane Separation

利用自主搭建的基于平板膜的纳滤-反渗透实验系统,参照一种实际煤化工分盐流程的废水配制实验样本,测定了不同废水离子含量下,纳滤膜和反渗透膜对Cl^-和SO_4^(2-)的截留率以及废水中添加邻苯二甲酸氢钾对纳滤膜和反渗透膜截留Cl^-和SO_4^(2-)效果的影响。结果表明,当SO_4^(2-)的质量浓度小于4 g/L时,在废水中添加邻苯二甲酸氢钾不影响纳滤膜对Cl^-和SO_4^(2-)的截留率。当SO_4^(2-)的质量浓度大于4 g/L时,废水中添加邻苯二甲酸氢钾提高了纳滤膜对Cl^-和SO_4^(2-)的截留率,但导致纳滤膜的分盐效果变差。废水中添加邻苯二甲酸氢钾对反渗透膜截留Cl^-和SO_4^(2-)没有影响,反渗透膜的分盐效果也不变。研究可为采用膜法分盐的技术处理工业废水提供理论分析和数据支持。

A series experiments ofnanofiltration and reverse osmosis （RO） filtration were conducted with a lab-scale plate membrane module. The experimental samples were prepared based on actual coal chemical waste liquids in separate and concentrate processes. The rejection rate of CI and SO4^2- by nanofiltration and reverse osmosis membrane and the effect of potassium hydrogen phthalate addition on the rejection rate were studied with different ion content in the wastewater. The results indicated that, the CI and SO4^2- rejection ratio of nanofiltration was almost the same after potassium hydrogen phthalate addition, when mass concentration of SO4^2- was less than 4 g/L. The potassium hydrogen phthalate increased the CI- and SO4^2- rejection ratio, but decreased selective rejection for sulfate ion and chloride, when mass concentration of SO4^2- is higher than 4 g/L. However, the potassium hydrogen phthalate addition had no effect on CI and SO4^2- rejection ratio and salt separation efficiency of reverse osmosis. This study provided the theoretical analysis and experimental data for industrial wastewater treatment in the way of salt separation by membrane technology.