Development of a computer simulation program of batch ion-exchange membrane electrodialysis for saline water desalination

• Published in: Desalination 2013-07, Vol.320, p.118-133
• Main Author: Tanaka, Yoshinobu
• Format: Article
• Language: English
• Subjects: Applied sciences; Chemical engineering; computer simulation; Computer simulation program; desalination; drinking water; Drinking water and swimming-pool water. Desalination; Drinking water production; energy; equations; Exact sciences and technology; Heat and mass transfer. Packings, plates; Ion exchange; Ion-exchange membrane; Limiting current density; Mass transport; Membrane separation (reverse osmosis, dialysis...); Multi-stage batch electrodialysis; Pollution; saline water; salt concentration; temperature; Water treatment and pollution
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2013.04.022

A computer simulation program of batch ion-exchange membrane electrodialysis is developed for saline water desalination. For proceeding with the computation, the relationships between the salt concentration in desalting cells, cell voltage and the five electrodialysis parameters are expressed by the equations using the continuous electrodialysis program. A salt solution is supplied to the batch electrodialysis process, and the performance changes with time are computed with an instantaneous open/shut feed operation of a solution taking salt concentration and cell voltage as parameters. A salt solution is supplied to a one-stage and a two-stage batch electrodialysis process and the performance of drinking water production is calculated. From cell pair number and energy consumption, the multi-stage operation is economically disadvantageous compared to the single-stage operation. Limiting current density of an electrodialyzer is expressed by the function including temperature and computed. •Computer simulation program of a batch electrodialysis process is developed for saline water desalination.•A salt solution is supplied to an electrodialyzer with an instantaneous open/shut operation.•Drinking water is produced in a one-stage and a two-stage batch electrodialysis process.•Multi-stage operation is economically disadvantageous compared to the single-stage operation.•Limiting current density is expressed by the function including temperature.