聚砜膜制备及正渗透处理酸性矿井水试验研究

Preparation of polysulfone membrane and treatment of acid mine drainage by forward osmosis

采用正渗透(FO)工艺处理酸性矿井水(AMD),以NaCl为原料液、MgCl2为汲取液,研究了汲取液浓度、膜取向、流速等操作条件对正渗透水通量及反向溶质扩散的影响。结果表明:FO对AMD中的Al^3+、Fe^2+、Cu^2+、Zn^2+等金属离子的截留率分别达到99.8%、100%、98.9%和99.5%,硫酸盐的截留率达到97.5%;采用纳滤工艺回收正渗透汲取液,对于Mg2+的截留率达到73.3%。

Forward penetration( FO) process was adopted to treat acid mine drainage( AMD),using NaCl as feed solution and MgCl2 as draw solution.The influences of operating conditions,such as concentration of draw solution,membrane orientation and flow rate,on water flux and reverse solute flux were systematically studied.The results showed that the rejection rates of metal ions Al^3+,Fe^2+,Cu^2+ and Zn^2+ in acid mine drainage were 99.8%,100%,98.9% and 99.5% respectively,and the retention rates of sulfate were 97.5%. The draw solution was recovered by nanofiltration process and the interception rate of magnesium ion reached 73.3%.