纳滤-反渗透技术用于高盐废水中NaCl的回收

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (3): 64-69.

纳滤-反渗透技术用于高盐废水中NaCl的回收

张栋强^*, 陈彦安, 张晶晶, 赵静, 苏娜, 段润豪

兰州理工大学石油化工学院, 甘肃兰州 730050

收稿日期:2020-06-29 出版日期:2021-06-28 发布日期:2021-07-19
通讯作者: 张栋强(1981-),男,甘肃静宁人,博士,教授.Email:zhangdq@lut.edu.cn
基金资助:
国家自然科学基金(21666018)

Nanofiltration-reverse osmosis process for recovery NaCl in high-salt wastewater

ZHANG Dong-qiang, CHEN Yan-an, ZHANG Jing-jing ZHAO Jing, SU Na, DUAN Run-hao

College of Petrochemical Technology, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2020-06-29 Online:2021-06-28 Published:2021-07-19

摘要/Abstract

摘要： 为了实现高盐废水中NaCl的回收,采用纳滤-反渗透双膜串级组合工艺,处理NaCl和Na₂SO₄的混合模拟废水,考察了浓度配比、操作压力、流速及温度等工艺参数对膜分离效果的影响,并确定出了最佳工艺参数.实验结果表明:在最佳工艺参数下,经纳滤和反渗透分离后的反渗透浓缩液中,[NaCl]/[Na₂SO₄]≥41.45,可实现NaCl和Na₂SO₄的有效分离;反渗透膜对Cl^－的截留率达到96%以上,回收得到的NaCl其纯度可达到97.5% 以上.

关键词: 高盐废水, 纳滤技术, 反渗透技术

Abstract: In order to realize the recovery of NaCl in high-salt wastewater, a nanofiltration-reverse osmosis double-membrane cascade combined process was used to purify the mixed simulated wastewater contained NaCl and Na₂SO₄. The concentration ratio, operating pressure, flow rate and temperature were investigated, and the most excellent technical conditions were determined. The experimental results showed that the value of [NaCl]/[Na₂SO₄] was not less than 41.45 in reverse osmosis concentrate, which indicated that the process can achieve separation of NaCl and Na₂SO₄effectively; In addition, the reverse osmosis membrane can separate Cl^－ with the rejection rate of Cl^－ more than 96%, and the purity of the recovered NaCl can reach over 97.5%.

Key words: high-salt wastewater, nanofiltration technology, reverse osmoses

中图分类号:

X703

张栋强, 陈彦安, 张晶晶, 赵静, 苏娜, 段润豪. 纳滤-反渗透技术用于高盐废水中NaCl的回收[J]. 兰州理工大学学报, 2021, 47(3): 64-69.

ZHANG Dong-qiang, CHEN Yan-an, ZHANG Jing-jing ZHAO Jing, SU Na, DUAN Run-hao. Nanofiltration-reverse osmosis process for recovery NaCl in high-salt wastewater[J]. Journal of Lanzhou University of Technology, 2021, 47(3): 64-69.