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Experimental study on the structure of spacer in a flow-electrode capacitive deionization

Abstract

The Flow-electrode Capacitive Deionization (FCDI) technology has recently been actively studied as a means of easy scale-up for a mass desalination based on the principle of electric double-layer capacitor. In this study, we investigated the structural characteristics of a porous insulating spacer, which determines the desalting performance. Therefore, we have tested the desalting effect of parameters, such as thickness, porosity, wettability, and flow rates of salt water (FRw). As a result, for FRw≥2 mL/min the desalting efficiency increase with decreasing the spacer’s thickness but for FRw<2 mL/min the optimum thickness is 0.6 mm in terms of desalting efficiency. Generally, utilizing of the 0.3 mm thickness spacer leads to the best configuration in this FCDI setup based on current efficiency criteria.  The results show that the optimum porosity for the porous spacer is 0.56 in terms of desalting efficiency and salt removal rate while the spacer with 0.44 porosity has the best performance based on current efficiency. In particular, there is no effect of wettability on the performance. It is observed that the desalting efficiency is increased by decreasing of FRw.

Journal Papers
Month/Season: 
Spring
Year: 
2020

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