Energy storage and generation through desalination using flow-electrodes capacitive deionization

Flow electrodes-based capacitive deionization (FCDI) is a highly energy-efficient desalination process compared to conventional processes, including reverse osmosis and multi-stage flash distillation. Furthermore, it provides a continuous desalination flow with high salt-removal capacity, whereas CD...

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Bibliographic Details
Published inJournal of industrial and engineering chemistry (Seoul, Korea) Vol. 81; pp. 317 - 322
Main Authors Lim, Hyunseung, Ha, Yuncheol, Jung, Hye Bin, Jo, Pil Sung, Yoon, Hana, Quyen, Do, Cho, Namchul, Yoo, Chung-Yul, Cho, Younghyun
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.01.2020
한국공업화학회
Subjects
Desalination
Electrochemical
Energy storage
Flow capacitor
Flow electrodes capacitive deionization
Ion-exchange membrane
화학공학
Ion-exchange membrane
Flow electrodes capacitive deionization
Flow capacitor
Desalination
Energy storage
Electrochemical
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Summary:Flow electrodes-based capacitive deionization (FCDI) is a highly energy-efficient desalination process compared to conventional processes, including reverse osmosis and multi-stage flash distillation. Furthermore, it provides a continuous desalination flow with high salt-removal capacity, whereas CDI using fixed electrodes requires additional electrode rinsing. In FCDI, salt ions are adsorbed onto flow carbon electrodes and stored in the electrode slurry container, which is similar to an electrochemical flow capacitor. Therefore, stored ions can generate energy during discharging in FCDI operation. In this study, such energy generation was systematically investigated in terms of the various discharging rates, feed concentrations, and volume of flow-electrode slurry. We found that the results were correlated with the changes in the salt concentration of the effluent flow. The discharging current of 50 mA showed the highest capacity for energy generation out of all the experimental conditions; it recovered around 25% of the energy consumed during FCDI desalination. We believe that such energy recovery can greatly reduce the energy consumption needed for FCDI desalination. Such recycling of generated energy would make FCDI more attractive than other conventional desalination techniques.
ISSN:1226-086X
1876-794X
DOI:10.1016/j.jiec.2019.09.020