EDTA对纳滤去除镉的效能影响

Influence of EDTA on removal of cadmium ions by nanofiltration

以EDTA为络合剂,选取含有重金属镉的土壤酸性沥出液为研究对象,探索络合纳滤工艺对镉离子的去除率和膜通量的强化效果,并研究pH、EDTA浓度和压力对络合纳滤过程的影响,同时采用正交实验设计对络合纳滤工艺的操作条件进行了优化.结果表明,EDTA可以明显地增强纳滤膜对镉离子的截留率和膜通量,并获得了络合纳滤工艺去除镉的最佳操作条件.

Ethylene diamine tetraacetic acid （EDTA） was chosen as the complexing agent to study the enhanced effects of nanofiltration for the removal of cadmium from soil acidic leachate. The effects of pH, concentration of EDTA and applied pressure on cadmium ion rejection were examined in complexation nanofiltration, and simultaneously its process conditions were optimized by orthogonal experimental design. The results showed that the cadmium ions rejection and the permeate flux increased obviously with the present of EDTA in nanofiltration process, and the best operating conditions of complexation nanofiltration obtained.