Chapter Six


Yoshinobu Tanaka     IEM Research, Ushiku-shi, Ibraki, Japan


The basic structure of an electrodialyzer consists of stacks in which cation-exchange membranes, anion-exchange membranes, and gaskets (desalting cells and concentrating cells) are arranged alternately. Spacers are incorporated with the gaskets to prevent the contact of cation-exchange membranes with anion-exchange membranes and to mix the solutions. On supplying salt solutions into the gaskets and passing an electric current across membrane pairs, salt concentration is decreased in desalting cells and increased in concentrating cells. The electrodialysis processes for saline water desalination are classified to (1) continuous (single-pass) process, ...

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