Method for operating an electrodialysis machine by reduction treatment of a cation exchange membrane

Abstract

This invention provides an operating method for an electrodialysis machine that offers excellent stability during electrodialysis. [Solution] The method of operating the electrodialysis apparatus of the present invention uses an electrodialysis apparatus equipped with a cation exchange membrane after reduction treatment to exchange iodide ions (I - The process includes the step of electrodialysis of a solution containing ).

Claims

1. Using an electrodialysis apparatus equipped with a cation exchange membrane that has undergone reduction treatment, iodide ions (I － A method for operating an electrodialysis apparatus, comprising the step of electrodialysis a solution containing ).

2. A method for operating an electrodialysis apparatus according to claim 1, A method for operating an electrodialysis apparatus, wherein the reduction treatment is a treatment in which a reducing agent is brought into contact with at least a portion of the surface of the cation exchange membrane.

3. A method for operating an electrodialysis apparatus according to claim 2, A method for operating an electrodialysis apparatus, wherein the reducing agent comprises one or more selected from the group consisting of thiosulfates, sulfites, bisulfites, oxalic acid, formic acid, hydrazine, and hypophosphorous acid.

4. A method for operating an electrodialysis apparatus according to claim 2, A method for operating an electrodialysis apparatus, wherein the reduction treatment is a process of immersing the cation exchange membrane in a liquid reducing agent.

5. A method for operating an electrodialysis apparatus according to claim 1 or 2, The aforementioned reduction process, Performed on the cation exchange membrane immediately before the start of operation, and / or A method for operating an electrodialysis machine, which is performed on the cation exchange membrane between the time the machine is stopped and the time the machine is restarted.

6. A method for operating an electrodialysis apparatus according to claim 5, An operating method for an electrodialysis machine, wherein when it is detected that the voltage rise reaches a predetermined value during operation, the reduction process is performed.

7. A method for operating an electrodialysis apparatus according to claim 1 or 2, A method for operating an electrodialysis apparatus, wherein the electrodialysis apparatus is equipped with a bipolar membrane.

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