Water
Electrodeionization is a water treatment process that uses a combination of membranes and direct current to continuously deionize water without the need for chemicals thus reducing the operating costs and the cost of waste neutralization and chemicals handling.
In order to control the ions movement inside the solution, various types of semi-permeable membranes are used:
- Anionic membranes, allowing the passage only to negative ions
- Cationic membranes, allowing the passage only to positive ions
- Bipolar membranes, allowing the passage to positive ions in one direction and to negative ones in the opposite direction
STC’s electrodeionization plants are composed of anode and cathode compartment with anionic and cationic exchange membrane. Anions and cations flow respectively towards the anion and the cation exchange membrane because of the electric force, thus leaving the feed water free of ions (deionized water). Substances that do not carry an electrical charge are not removed.
