摘要
针对苦咸水硬度高、含盐量高的问题,研究纳滤-反渗透耦合工艺在较低的运行压力下对离子成分复杂的苦咸水进行深度脱盐的情况,采用三种纳滤膜和两种反渗透膜对含盐量为6~10 g/L的多组分模拟苦咸水进行两级脱盐实验。结果表明,操作压力升高或进水浓度降低时各膜的膜通量和溶解性总固体(TDS)截留率均增大,且纳滤膜具有显著的离子选择性,DK2540和2540NH对二价离子去除率最高为98.2%和98.3%;国产反渗透膜BW2540在二级脱盐中表现出更高的膜通量和TDS截留率。经过对比实验,2540NH和BW2540的纳滤-反渗透膜是最佳组合,在运行压力小于1.5 MPa时,总脱盐率不低于99.5%,表明该工艺对苦咸水深度脱盐效果较好,可以为后续工程化研究提供数据参考。
To address the challenge of high hardness and salt content in brackish water,a coupling process of nanofiltration and reverse osmosis was studied for the deep desalination of multi-ion brackish water under low operating pressure.Three nanofiltration membranes and two reverse osmosis membranes were used in two-stage desalination experiments on simulated brackish water with a salt content ranging from 6 to 10 g/L.The flux and total dissolved solids(TDS)retention rates for each membrane increased as the operating pressure rose or the influent salinity decreased.The nanofiltration membranes demonstrated significant ion selectivity,with DK2540 and 2540NH showing the highest removal rates of divalent ions at 98.2% and 98.3%,respectively.The BW2540 reverse osmosis membrane exhibited higher flux and TDS retention in the secondary desalination stage.Based on comparative experiments,the combination of 2540NH and BW2540 proved to be optimal,achieving a total desalination rate of no less than 99.5% under an operating pressure of 1.5 MPa.This process shows great potential for deep desalination of brackish water and provides valuable data for future engineering applications.
作者
陈涵
翁琦辉
杨岳平
CHEN Han;WENG Qihui;YANG Yueping(College of Environmental&Resource Sciences,Zhejiang University,Hangzhou 310000,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2024年第12期83-88,101,共7页
Technology of Water Treatment
关键词
多组分苦咸水
纳滤膜特性
耦合工艺
深度脱盐
multi component brackish water
characteristics of nanofiltration membranes
coupling process
deep desalination
