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González A, Grágeda M, Ushak S. Modeling and Validation of a LiOH Production Process by Bipolar Membrane Electrodialysis from Concentrated LiCl. MEMBRANES 2023; 13:187. [PMID: 36837690 PMCID: PMC9963233 DOI: 10.3390/membranes13020187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 01/23/2023] [Accepted: 01/30/2023] [Indexed: 06/18/2023]
Abstract
Electromembrane processes for LiOH production from lithium brines obtained from solar evaporation ponds in production processes of the Salar de Atacama are considered. In order to analyze high concentrations' effect on ion exchange membranes, the use of concentrated LiCl aqueous solutions in a bipolar membrane electrodialysis process to produce LiOH solutions higher than 3.0% by mass is initially investigated. For this purpose, a mathematical model based on the Nernst-Planck equation is developed and validated, and a parametric study is simulated considering as input variables electrolyte concentrations, applied current density, stack design, process design and membrane characteristics. As a novelty, this mathematical model allows estimating LiOH production in a wide concentration range of LiCl, HCl and LiOH solutions and its effect on the process, providing data on final LiOH solution purity, current efficiency, specific electricity consumption and membrane performance. Among the main results, a concentration of 4.0% to 4.5% by LiOH mass is achieved, with a solution purity higher than 95% by mass and specific electrical energy consumption close to 4.0 kWh/kg. The work performed provides key information on process sensitivity to operating conditions and process design characteristics. These results serve as a guide in the application of this technology to lithium hydroxide production.
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Peng Z, Li Y, Sun Y. Treatment of 2-Mercapto-5-methyl-1,3,4-thiadiazole (MMTD) wastewater by bipolar membrane electrodialysis: MMTD migration, process factors and implications. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Chen T, Bi J, Ji Z, Yuan J, Zhao Y. Application of bipolar membrane electrodialysis for simultaneous recovery of high-value acid/alkali from saline wastewater: An in-depth review. WATER RESEARCH 2022; 226:119274. [PMID: 36332296 DOI: 10.1016/j.watres.2022.119274] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 10/13/2022] [Accepted: 10/17/2022] [Indexed: 06/16/2023]
Abstract
With the development of comprehensive utilization of high-salinity wastewater, salt resources regeneration has been considered as the fundamental requirement for process sustainability and economic benefits. As one of the potential candidates, bipolar membrane electrodialysis (BMED) was rapidly developed in recent years for the treatment of saline wastewater. Different from other methods directly obtaining salts or condensed wastewater, BMED could utilize and convert the dissolved waste salt into higher-value acid and alkali simultaneously, which has various advantages including outstanding environmental effects and economic benefits. In this review, the recent applications of BMED for waste salt recovery and high-value acid/alkali generation from saline wastewater were systematically outlined. Based on the summary above, the economy analysis of BMED was further reviewed from the roles of desalination and resources recovery. In addition, the BMED-based processes integrated with in-situ utilization of the generated acid/alkali resources were discussed. Furthermore, the influence of operating factors on BMED performance were outlined. Finally, the strategies for improving BMED performance were concluded. Furthermore, the future application and prospects of BMED was presented. This work would provide guidance for the applications of bipolar membrane electrodialysis in saline wastewater treatment and the high-value conversion of salt resources into acids and alkalis.
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Affiliation(s)
- Tianyi Chen
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China
| | - Jingtao Bi
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Engineering Research Center of Seawater Utilization of Ministry of Education, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Hebei Collaborative Innovation Center of Modern Marine Chemical Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China
| | - Zhiyong Ji
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Engineering Research Center of Seawater Utilization of Ministry of Education, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Hebei Collaborative Innovation Center of Modern Marine Chemical Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China
| | - Junsheng Yuan
- Engineering Research Center of Seawater Utilization of Ministry of Education, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Hebei Collaborative Innovation Center of Modern Marine Chemical Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China
| | - Yingying Zhao
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Engineering Research Center of Seawater Utilization of Ministry of Education, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Hebei Collaborative Innovation Center of Modern Marine Chemical Technology, No.8, Guangrong Road, Hongqiao District, Tianjin 300130, China; Tianjin Key Laboratory of Chemical Process Safety, Tianjin 300130, China
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