四种纳滤膜对高盐废水分盐效果分析

为了使煤化工零排放高盐废水分盐产出高质量NaCl和Na2SO4结晶盐,提高废水处理过程的分盐效率,以宁东某煤化工零排放高盐废水的水质情况模拟配制了无机盐溶液,选取了膜1、膜2、膜3和膜4等4种商用纳滤膜,探讨了其对模拟高盐废水中的常规离子(Mg2+、Ca2+、Na+、K+、SO42-、Cl-、NO3-)的截留率,并考察...

Analysis on salt separation performance of four nanofiltration membranes in high salinity wastewater

In order to improve the quality of NaCl and Na2SO4 salt crystals separated out from the high salinity wastewater of coal-chemical industry zero-discharge process,and improve the salt separation efficiency during the wastewater treatment process,inorganic salt solution was prepared according to the quality of the high salinity wastewater from the zero-discharge process of a coal-chemical plant in Ningdong,and then,was treated by 4 kinds of commercial nanofiltration membranes including membrane 1,2,3 and 4,the rejection rates of common ions(Mg2+,Ca2+,Na+,K+,SO42-,Cl-,NO3-)in the simulated high salinity wastewater were discussed;besides,the water flux and salt-separation efficiency by the said 4 kinds of nanofiltration membranes were investigated.The results showed that,the rejection rates of cations by the said 4 kinds of membranes followed the descending order of Ca2+>Mg2+>K+>Na+,the rejection rate of SO42-was 95%-99%,and the rejection rates of Cl-and NO3-were negative.The order of theρ(Cl-)/ρ(SO42-)value of 4 nanofiltration membranes on the produced side was membrane 1>membrane 4>membrane 2>membrane 3.Nanofiltration membrane 1 exhibited better rejection rate on inorganic salt ions and better salt separation efficiency.