Electrodialysis Control Parameters

Abstract

Electrical conductivity, pH and concentration of the electrolyte, electric current or applied potential, are the basic control parameters of an electrodialysis system. However, to ensure the technical feasibility and an efficient use of electrodialysis processes, it is essential to understand the electrochemical behavior of ion exchange membranes, its stability, conductivity and selectivity. It is also important to observe some specific conditions of electrochemical processes, such as the occurrence of concentration polarization and limiting current density. Therefore, the main objective of the present chapter is to give a brief summary of the different control parameters that are important to decide which membrane is the most appropriate and to establish the maximum current density that can be used for a given application.