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Operation of Electrodialysis at Over Limiting Current Density  

박진수 (광주과학기술원 환경공학과)
최재환 (공주대학교 화학공학과)
문승현 (광주과학기술원 환경공학과)
Publication Information
Membrane Journal / v.12, no.3, 2002 , pp. 171-181 More about this Journal
Abstract
The parameter which determines the plateau length of current-voltage curve for ion- exchange membranes was studied at various concentrations of NaCl and different flow rates. Moreover, the feasibility of the electrodialytic removal of 0.1 M NaCl solution at various current densities was tested by assessing the electrodialysis performance parameters such as salt removal efficiency, current efficiency, energy consumption and water dissociation. The diffusion boundary layer (DBL) thickness decreased with the NaCl concentration and flow rate of fled solution and it was observed that the plateau length of current-voltage curves was related with the DBL thickness. The removal efficiency and current efficiency were not affected significantly by the current densities even at the overlimiting current region indicating that most current were passed by electrolyte, and water dissociations are not responsible for the overlimiting current. Energy consumption increased when the current density supplied exceeded the limiting current density (LCD) values, because additional energy was necessary to overcome the plateau potential. Beyond the LCD values the energy consumption required to get a certain removal efficiency was not affected by the current density applied. The result suggests that it is allowed to operate electrodialysis processes at as high as possible current density unless water-splitting does not occur.
Keywords
eiectrodialysis; ion-exchange membrane; current-voltage curve; plateau length; over-limiting current density;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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