https://scholars.lib.ntu.edu.tw/handle/123456789/639164
標題: | Achieving high water recovery in a redox-flow battery with graphite felt electrodes for brine concentration | 作者: | Tsai, Shih Kuan Chen, Tsai Hsuan Ma, Jinxing CHIA-HUNG HOU |
關鍵字: | Brine concentration | Graphite felt | Redox-flow battery | Reverse osmosis rejects | Water recovery | 公開日期: | 6-四月-2024 | 卷: | 574 | 來源出版物: | Desalination | 摘要: | A redox-flow battery (RFB) with a four-chamber architecture was used for efficient brine concentration with high water recovery. Hereby, the graphite felt (GF) electrodes pretreated at 400°C in air for 2 hours (GF400-2) were utilized to promote the redox reactions of the ferri/ferrocyanide electrolyte in the RFB system. The GF400-2 electrodes exhibited a low charge-transfer resistance of 3.53 Ω in electrochemical impedance spectroscopy analysis, and a 4.9-fold increase in peak current observed in cyclic voltammetry analysis. When treating a 4.5 g/L NaCl solution at 0.4 V, the RFB with GF400-2 demonstrated 1.7-fold higher average salt concentration rate (ASCR) than that of the RFB without GF electrodes. Moreover, increasing the water recovery from 50% to 90% had minimal effects on the energy consumption for brine concentrations in the RFB system. This feature highlights the potential application for high water recovery in concentrating the real industrial reverse osmosis rejects (ROR). As demonstrated, the RFB with GF400‐2 efficiently concentrated the ROR by a factor of 6.9, achieving a high ASCR of 138.2 μg/min/cm2, while exhibiting a low energy consumption of 0.71 kWh/m3. These findings offer valuable perspectives on brine management with an energy-efficient, high-water recovery RFB, establishing its significance in this domain. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/639164 | ISSN: | 00119164 | DOI: | 10.1016/j.desal.2023.117289 |
顯示於: | 環境工程學研究所 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。