| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation method for an electric power-saving electric deionized water production device capable of easily removing a scale. SOLUTION: In this deionized water production device, an ion exchanger is packed at two small desalting chambers d1 and d2 divided by one side cation exchange membrane 3, the other side anion exchange membrane 4 and an intermediate ion exchange membrane 5 placed between both ion exchange membranes, and an anion exchanger is packed in the desalting chamber d1 as the ion exchanger packed to constitute a desalting chamber D1. The concentration chambers 1 are provided at the both sides of the desalting chamber D1 through the cation exchange membrane 3 and anion exchange membrane 4. The desalting chamber D1 and the concentration chamber 1 are arranged between an anode 7 and a cathode 6, and the water to be treated is made to flow into the desalting chamber d2 while applying voltage. Then, the effluent of the desalting chamber d2 is made to flow into the desalting chambers d1 and also concentrated water is made to flow into the concentration chamber 1 to remove an impurity ion in the water to be treated and to form the deionized water and a stage for washing the concentration chamber in which the effluent of the desalting chamber d2 is disparaged to the outside of the system without flowing into the desalting chambers d1 and also the concentrated water is made to flow into the concentration chamber 1 to remove an impurity anion in the water and to lower the pH of the concentrated water are provided.
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