| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology of electrodialysis capable of efficiently obtaining harmless fresh water. SOLUTION: In the electrodialysis method uses a plurality of electrodialytic chamber sets comprising a group of ion exchange membranes having a selective ion permeability, wherein for at least either of a group of electrodialytic chambers comprising ion (electrolyte) enriching sections or a group of electrodialytic chambers comprising ion (electrolyte) removing sections, current efficiency can be improved by allowing a current to flow in a serial direction to the plurality of electrolytic chamber sets having solution passage structures disposed in cascade so as to allow the conductivity (electric conductivity) of each electrolytic chamber comprising the group of electrolytic chambers to change step by step, thereby the harmless fresh water can be efficiently obtained. Furthermore, high-conductivity and harmless fresh water can be efficiently obtained by supplying low-conductivity water containing a water pollutant of high BOD, or the like, to the electrolytic chambers on the ion (electrolyte) enriching section sides and by supplying the high-conductivity water not containing water pollutants such as the sea water to the electrolytic chambers on the ion (electrolyte) removing section sides.
|
