Effect of Desorption Methods on Electrode Regeneration Performance of Capacitive Deionization
Publication: Journal of Environmental Engineering
Volume 143, Issue 9
Abstract
Long regeneration time and substantial water usage in desorption cycles impose potential barriers for practical applications of capacitive deionization (CDI). In this research, a single-pass continuous-flow CDI cell was used to explore the effect of desorption methods on electrode regeneration performance. The results demonstrated effective nature of polarity reversal during electrode regeneration compared to the conventional short-circuit method. A reversed polarity with optimized duration and magnitude of cell voltage while purging with a proper flow scheme exhibited substantial reductions on regeneration time and flush-water usage during the desorption processes of CDI. The beneficial aspects of preferred desorption methods were attributable to minimization of a readsorption effect by limiting the rate of ion transport to the oppositely charged electrode. The results of this research are beneficial for improving the operational efficiency and cost-effectiveness of CDI systems for engineering applications.
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Acknowledgments
This research was supported by Minn Water (Minneapolis, Minnesota, United States) under Project No. 1390501914. The authors acknowledge Ningbo Chuanming Electrosorption Equipment Co. Ltd. (Ningbo, China) for assistance on acquiring materials for the bench work and providing accommodation for Q. Yao’s stay in Ningbo. H. Tang acknowledges Min Wan and Yanting Li for testing the durability of electrodes.
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Published In
Journal of Environmental Engineering
Volume 143 • Issue 9 • September 2017
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©2017 American Society of Civil Engineers.
History
Received: Feb 2, 2016
Accepted: Feb 21, 2017
Published online: May 10, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 10, 2017
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