| 摘要 |
PROBLEM TO BE SOLVED: To provide a spiral type electric deionizing device which increases a pass water flow rate without increasing water pass pressure drop, makes it possible to obtain highly treated water equivalent to heretofore and prevents the scale formation in a concentrating chamber. SOLUTION: A leaf 8 is formed by alternately laminating and arranging two sheets of anion exchange membranes 1 and two sheets of cation exchange membranes 2. The leaf 8 is spirally wound around the outer periphery of a central electrode 21 and the winding is housed in a vessel 22. Raw water flows from a port 23 of the vessel 22 into a raw water introducing chamber 24 and part thereof flows into a water feed chamber 9 of the leaf 8, is distributed from the feed water chamber 9 into respective diluting chambers 5 and flows in a spiral direction within the respective diluting chambers 5. The other part of the raw water in the raw water introducing chamber 24 flows in a direction parallel to the axial line of the winding 12 within the concentrating chamber 6 formed by spacers 7a and 7b, flows into a concentrated water take-out chamber 25 and is taken out of a port 26 of the vessel 22. While the water flows in the diluting chambers 5, the anions and cations in the raw water are permeated through the anion exchange membranes 1 and the cation exchange membranes 2 and are moved to the adjacent concentrating chamber 6.
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