(752b) Predictive Models for Ion Removal in Brackish Water Desalination Using Electrodialysis Process

Electrodialysis (ED) is a membrane-based desalination technology which is widely used to desalinate brackish water. The performance of this technology is affected by operating parameters, such as temperature, velocity, applied voltage, and feedwater composition. In this research a form of empirical model was developed using dominant dimensionless numbers in the ED/EDR process and showing the Stanton number as a function of Peclet number and the dimensionless applied voltage. This dimensionless form of the model extends the model’s applicability to large scales. Additionally, a new model was developed for the selective removal of ions in ED/EDR based on the presented dimensionless ion removal correlations, showing how operating factors affect the removal of divalent counter ions against monovalent counter ions.