Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.desal.2005.01.014
Title: A new method to determine the optimal operating current (Ilim′) in the electrodialysis process
Authors: Meng, H.
Deng, D.
Chen, S.
Zhang, G. 
Keywords: Desalting efficiency current (η-I) curve
Electrodialysis (ED)
Optimal operating current
Issue Date: 5-Sep-2005
Source: Meng, H., Deng, D., Chen, S., Zhang, G. (2005-09-05). A new method to determine the optimal operating current (Ilim′) in the electrodialysis process. Desalination 181 (1-3) : 101-108. ScholarBank@NUS Repository. https://doi.org/10.1016/j.desal.2005.01.014
Abstract: According to classical electrodialysis (ED) theory, measuring limiting current (Ilim) with an assembled stack is a commonly used technique to decide operating current. The current/voltage method of recognizing limiting current does not always yield unambiguous estimates of the limiting condition when applied to a practical electrodialysis apparatus. Some researchers have suggested an arbitrary method of using current/voltage data. Considering that the aim of ED was to obtain high desalting efficiency, a new parameter regarding the optimal operating current has been defined as Ilim′, and a new method to determine Ilim′ was proposed to guide the operation of the ED process in this paper. This method consisted of measuring current as a function of desalting efficiency and determining the inflexion in a η-I curve. To prove the feasibility of Ilim′, the V/I, V/I-I and η-I curves were plotted and compared by using NaCl aqueous solutions at different conductivities. The experimental results showed that Ilim′ determined by the η-I curve was exactly located between the two inflexions in the V/I and V/I-I curves. A method of combining the η-I curve with the V/I-I curve was proposed to decide the range of operating current. Compared to the current/voltage method, this method is more readable and practical. © 2005 Elsevier B.V. All rights reserved.
Source Title: Desalination
URI: http://scholarbank.nus.edu.sg/handle/10635/84503
ISSN: 00119164
DOI: 10.1016/j.desal.2005.01.014
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