期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 46, 期 -, 页码 152-156出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2014.06.004
关键词
Desalination; Capacitive deionization; Slurry electrode
资金
- Alexander von Humboldt Foundation
We report batch and continuous electrochemical desalination utilizing the ion adsorption capacity of a slurry containing carbon particles. Two carbon suspensions and the feed water are fed into the electrochemical cell operated according to the principle of membrane assisted capacitive deionization (MCDI). In a batch mode operation after the desalination step is complete the adsorbed ions are discharged from flowing electrodes to the same portion of water using polarity reversal. Operation with 15 g NaCl/I water solution resulted in extremely high apparent salt adsorption capacity (SAC) value of 260 mg/g(dry) (carbon). This value is much higher than the highest value of SAC reported until now - 14.3 mg/g. The reason for this phenomenon is not clear and further research is currently performed. In a new truly continuous process, both slurry streams are continuously recirculated between the desalination module and a regeneration/concentration module operated with the same functionality but with reversed potential. Ions desorb from the flowing electrodes and concentrate through the membranes into a purge stream. We prove continuous operation with desalination rate of more than 99% for an initial salt concentration of 1 g NaCl/I. Concentration factors depend on the recovery, with 90% water recovery being demonstrated easily. (C) 2014 Elsevier B.V. All rights reserved.
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