Brackish water desalination by electrodialysis: batch recirculation operation modeling

In this paper, a mathematical model for the desalination of brackish water through controlled potential electrodialysis has been developed. The application of this model allows: (i) to predict the behaviour of the system, (ii) to calculate the electrical energy consumption and (iii) to calculate the necessary time for successful desalination. The model has been applied with satisfactory results to the desalination of a NaCl solution in different experimental conditions. The model developed could be applied to commercial electrodialyzers (pilot/industrial plant) working in batches with recirculation and controlled potential, which is the usual mode of operation of such equipment when the requirements for treated water are moderated.