Abstract
Publisher Summary This chapter presents an overview of electro-deionization (EDI). EDI was applied to concentrate radioactive aqueous wastes. The use of ion exchange resins in the diluting compartment is the key to the process. To understand the mass transport phenomena arising in the EDI system, the two-stage ion transport process in the desalting compartment is discussed. The structure of the EDI unit is illustrated in the chapter. Based on the principle of electrodialysis (ED), cation exchange membranes and anion exchange membranes are arranged alternately. The feature of the water dissociation generated in the EDI system resembles to the bipolar membrane ED system. The chapter discusses the mechanism of the water dissociation reaction in the EDI system. Weakly-ionized species such as silica, carbon dioxide, boron and ammonia are difficult to remove through the membrane process such as reverse osmosis (RO), and electrodialysis reversal (EDR). However, EDI removes these species effectively. The chapter discusses how the EDI process successfully removes various weakly-ionized species.
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