Abstract
Electrodeionization (EDI) is a mixed-bed deionization process built into an electrodialysis system composed of ion exchange membranes and ion exchange resins. The deionization systems are classified to the mixed-bed, layered-bed, and separated-bed. In these systems, the hydrogen and hydroxyl ions are generated by the water splitting reaction in the resins and in the membranes and recombined to form water molecules (water regeneration). EDI accelerates desalination and produces ultrapure water in the diluate compartments. In a process train in which reverse osmosis is followed by EDI, high-purity water is produced, which is comparable to mixed-bed ion exchange treated water. Weaklyionized species such as silica, carbon dioxide, boron, and ammonia are removed effectively. EDI is applied to ultrapure water production in electric power generation, semiconductor manufacturing processes, the pharmaceutical industry, etc.
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