Electrodialysis (ED) is one of the membranous process for seawater desalination, which due to the less energy consuming is a desirable method in comparison with other ones such as thermal methods. In this investigation, computational fluid dynamics (CFD) modeling approach for the simulation of ED unit was studied. Fluid dynamics and ion transfer were simulated using the Navier-Stokes and Nernst-Planck equations, respectively and they were solved via finite element method (FEM). The effects of operating parameters i.e. feed concentration, temperature and voltage on the separation process were evaluated and their best value for obtaining the optimal separation percentage (SP) were determined. The concentration of 10000, 20000 and 40000 ppm, the temperature of 25, 40 and 55ºC, and the voltage of 5, 7, 9 V were used to determine impressive parameters in simulation. The results showed that the highest efficiency were obtained at high temperatures and voltage and lowest feed concentration, which was good agreement with observed ones. Moreover, the average deviation from experimental data was less than 2% for optimum condition.
