| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric deionizer which can be operated stably for a long period of time without generating scale even when a hardness component is contained in the water to be treated. SOLUTION: The electric deionizer is obtained by alternately arraying a plurality of anion exchange membranes 13 and a plurality of cation exchange membranes 14 between a cathode 12 and an anode 11 to alternately form concentration chambers 15 and demineralization chambers 16. A bipolar membrane 20 is arranged in each of concentration chambers 15 to divide each concentration chamber 15 into a cathode-side divided chamber 15A and an anode-side divided chamber 15B. A mixed resin of an anion exchange resin with a cation exchange resin is packed in the concentration chamber 15. The mixed resin to be packed in the cathode-side divided chamber 15A is packed so that the a mixing ratio of the anion exchange resin is made higher in the upper part of the cathode-side divided chamber and the mixing ratio of the cation exchange resin is made higher in the lower part. The mixed resin to be packed in the anode-side divided chamber 15B is packed so that the mixing ratio of the cation exchange resin is made higher in the upper part of the anode-side divided chamber and the mixing ratio of the anion exchange resin is made higher in the lower part. COPYRIGHT: (C)2008,JPO&INPIT
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