Electrodialysis is a process that permits to partially or totally remove the ions present in a solution by their migration through selective ion-exchange membranes under an electric field.
Two configurations are possible:
- Conventional electrodialysis : initially applied for sea water treatment, the process permits to demineralize a solution. The stack is composed of an alternance of homopolar anionic and cationic membranes.
- Bipolar electrodialysis: it permits to convert a salt in its associated acidic or basic form, while demineralizing the solution. The stack is composes of an alternance of anionic or cationic membranes, and bipolar membranes dissociating water.