Green technology of high efficiency enrichment and recovery of sodium chloride in high salinity industrial wastewater

被引：0

作者：

Fu J. ^{[1
]}

Sun Z. ^{[1
,2
]}

Wang H. ^{[1
]}

Li X. ^{[1
]}

Lu J. ^{[1
]}

Tong T. ^{[2
]}

Zhu M. ^{[2
]}

Chai L. ^{[2
,3
]}

Wang Y. ^{[1
,2
,3
]}

机构：

[1] School of Environmental and Safety Engineering, North University of China, Taiyuan

[2] School of Metallurgy and Environment, Central South University, Changsha

[3] Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Central South University, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 02期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

capacitive deionization; chloride ion; enrichment; high salinity wastewater; NaCl; recovery;

D O I：

10.11817/j.issn.1672-7207.2023.02.017

中图分类号：

学科分类号：

摘要：

Industrial waste water contains high concentration of salt and chloride ion, which is the bottleneck restricting the reuse and discharge of industrial waste water. To enrich NaCl in industrial waste water, Cl− adsorbed on the surface of electrode materials was desorbed by electrical desorption based on a three-dimensional electrode device in recycling the desorption solution. The effects of cathode potential, desorption time and pH on cathode desorption were investigated. The effects of potential and current on NaCl enrichment were studied. NaCl was recovered from the enriched solution by temperature-controlled crystallization, and the crystallization products were characterized. The results show that the Cl− desorption rate is 100% after 300 min with a cathode potential of −1.7 V, pH=13 and cycle speed of 140 mL /min. When the cathode potential is −3.01 V and the current is 2.17 A, the concentration of NaCl is enriched to 0.5 mol/L, which is 18 times that of raw water. When the enrichment solution is crystallized at the temperature of 100 ℃, the pure NaCl crystal with the crystallization rate of 47.4% is obtained. In this process, activated carbon can be recycled and reused, and NaCl in the desorption solution can be enriched and recycled. Therefore, this process is a green and environmentally friendly technical route without secondary pollution. © 2023 Central South University of Technology. All rights reserved.

引用

页码：577 / 586

页数：9

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