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http://dx.doi.org/10.14478/ace.2019.1042

Stable Desalination of Hardness Substances through Charge Control in a Capacitive Deionization System  

Kim, Yoon-Tae (Department of Chemical Engineering, Kongju National University)
Choi, Jae-Hwan (Department of Chemical Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.30, no.4, 2019 , pp. 472-478 More about this Journal
Abstract
A stable desalination method of the hardness substance such as $Ca^{2+}$ by controlling the total charge (TC) supplied to the membrane capacitive deionization (MCDI) cell was studied. The adsorption (1.5 V) and desorption (0.0 V) were repeated 30 times while varying the TC in the adsorption process. The concentration and pH of effluent, adsorption and desorption amounts, current densities and cell potentials were analyzed in the desalination process. The maximum allowable charge (MAC) of the carbon electrode used in MCDI cell was measured to be 46 C/g. As a result of operation at TC (40 C/g) below the MAC value, electrode reactions did not occur, resulted in the stable desalination characteristics for a long-term operation. When operating at TCs (50, 60 C/g) above the MAC value, however, the concentration and pH of effluent varied greatly. Also, the scale was formed on the electrode surface due to electrode reactions, and the electric resistance of the cell gradually increased. It was thus concluded that it is possible to remove stably the hardness substance without any electrode reactions by controlling the charge supplied to MCDI cell during the adsorption process.
Keywords
Capacitive deionization; Maximum allowable charge; Electrode reactions; Electrode potential; Cell potential;
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