高矿化度矿井水超滤-反渗透脱盐试验研究

Experimental study on ultrafiltration-reverse osmosis desalination of highly mineralized mine water

为了实现高矿化度矿井水的综合利用,对梧桐庄矿经过深化处理的矿井水应用超滤(UF)-反渗透(RO)工艺进行了脱盐试验研究。超滤预处理系统的研究内容包括膜压差、超滤膜反冲洗周期最佳参数的确定;反渗透系统的研究内容包括压力、温度对系统的影响以及相关离子的去除率。试验结果表明:超滤系统的膜压差宜控制在0.122 MPa,反冲洗周期宜控制在30 min~45 min;反渗透系统的操作压力宜控制在1.4 MPa~2.0 MPa,操作温度宜控制在14℃~24℃,最佳温度在22℃左右;反渗透系统对Ca2+、Mg2+、SO42-等二价离子去除率在98%以上,对一价Cl^(-)去除率在96%以上,对总硬度的去除率在97%以上。为避免膜结垢堵塞,保证反渗透系统的稳定、连续运行,工程设计中反渗透系统脱盐率一般按97%设计。

In order to realize the comprehensive utilization of highly mineralized mine water,the experimental study was made on using ultrafiltration(UF)-reverse osmosis(RO)process for desalination of deeply processed mine water in Wutongzhuang Mine.The research of ultrafiltration pretreatment system included the determination of membrane pressure difference and optimal parameters of ultrafiltration membrane backwash cycle.The research of reverse osmosis system included the influence of pressure and temperature on the system and the removal rate of related ions.The test results showed that the membrane pressure difference of ultrafiltration system should be controlled at 0.122 MPa,and the backwash cycle should be controlled at 30 min-45 min.The operating pressure of the reverse osmosis system should be controlled within 1.4 MPa-2.0 MPa,the operating temperature should be controlled within the range of 14℃-24℃,and the optimal temperature was about 22℃.The removal rate of divalent ions such as Ca2+,Mg2+,SO42-by the reverse osmosis system was more than 98%,the removal rate of monovalent Cl^(-)was more than 96%,and the removal rate of total hardness was more than 97%.In order to avoid membrane fouling and blockage and ensure the stable and continuous operation of the reverse osmosis system,the desalination rate of the reverse osmosis system in the engineering design was generally designed as 97%.