无机陶瓷纳滤膜分离高钠盐废水中的锶

本实验研究表明,仅用截留分子量为1000的无机陶瓷纳滤膜分离高钠盐模拟溶液中的锶,分离效果并不理想.为提高陶瓷纳滤膜对锶的选择分离效果,选择了分子量为3000的聚丙烯酸作为陶瓷纳滤膜分离的强化剂,重点探讨了溶液pH值、聚丙烯酸浓度、温度及离子强度对模拟溶液盐分离效果和膜通量的影响,并得到了适宜的锶钠分离条件.实验结果表明,在适宜条件下,通过聚丙烯酸强化和两级分离,陶瓷纳滤膜可大大提高模拟溶液中锶离子的选择分离效果,锶/钠的分离因子高达205.

Separation of strontium from high sodium-containing wastewater by inorganic ceramic nanofiltration membrane

The experiment showed that the separation efficiency of strontium from high sodium-containing simulated solution was moderate by ceramic nanofiltration membrane with the molecular weight cut-off of 1000 Dal.In order to improve the separation efficiency of strontium,a water soluble poly(acrylic) acid with molecule 3000 Dal was introduced as a polymer to enhance the selective separation efficiency in the ceramic nanofiltration.The effects of solution pH,poly(acrylic) acid concentration,temperature and ion strength on separation efficiency were investigated in this study,and the most suitable condition of strontium separation from simulated solution was determined.The results show that under the most suitable condition,the separation efficiency of strontium from model solution was greatly improved with addition of poly(acrylic) acid,and the separation factor between strontium and sodium was up to 205 by two-stage separation.