膜技术在海水淡化浓盐水资源化利用中的试验研究

Experimental Study on Membrane Technology in the Utilization of Seawater Desalination Brine

采用以“超滤+纳滤”(UF+NF)为主体工艺的中试装置对海淡浓盐水进行实验,探究浓盐水资源化利用的可行性。实验结果表明,超滤单元UF出水浊度<0.2 NTU,SDI 15值<0.8,满足后续有机膜单元的进水水质要求。纳滤单元选取2种不同型号纳滤膜进行实验,综合对比DK纳滤膜截留率效果较好,纳滤产水用于氯碱化盐,不仅能够节约纯水,减少原料氯化钠的消耗,同时解决了浓海水排放的问题,实现变废为宝。

The experimental study on the resource utilization of the sea salt brine was carried out by using a pilot plant with ultrafiltration and nanofiltration(UF+NF)as the main process.The results showed that UF effluent was<0.2 NTU and SDI 15 value was<0.8,meeting the influent water quality requirements of subsequent organic membrane units.The nanofiltration unit was selected from two different types of nanofiltration membranes for experimental research.The comprehensive comparison of the DK nanofiltration membrane the rejection rate of divalent ions was better.Nanofiltration water was used to dissolve salt,which can save pure water and reduce the consumption of raw material sodium chloride,at the same time,it can solve the problem of discharge of concentrated seawater and turns waste into treasure.