To provide an electric deionized water production apparatus and a deionized water production method which solve problems occurring when water to be treated is used as electrode water while saving cost.
The apparatus includes electrode chambers E1 and E2 which are composed of an anode chamber E1 and a cathode chamber E2, cation desalination chambers D1 and S1 which are adjacent with cation exchange films c1 and c2 on the side of the cathode chamber E2 and filled with at least a cation exchanger, and anion desalination chambers D2 and S2 which are adjacent with anion exchange films a1 and a2 on the side of the anode chamber E1 and filled with at least an anion exchanger. The cation desalination chambers D1 and S1, and the anion desalination chambers D2 and S2 are communicated to each other so that one part of intermediate treated water in which at least an anion component is removed, flowing out from the anion desalination chambers D2 and S2, flows into the cation desalination chambers D1 and S1. The anion desalination chambers D2 and S2 and the electrode chambers E1 and E2 are communicated to each other, so the other part of intermediate treated water flowing out from the anion desalination chambers D2 and S2 flows into the electrode chambers E1 and E2.
SASAKI KEISUKE
Ishibashi Masayuki
Masaaki Ogata