| abstract |
An ion exchange device that has a small pressure loss and can efficiently remove chlorite ions in a short time is provided. Kind Code: A1 A binder fiber using an ethylene vinyl alcohol copolymer core-sheath fiber having polypropylene as a core material and a strongly basic Cl type anion exchange fiber are wet-processed to form a Cl type anion exchange fiber of 20 to 50%. A sheet containing 95% by weight and 5 to 80% by weight of a binder fiber is prepared, and this sheet is heated to fix the fibers together to form an ion-exchange fiber sheet. Further, the above ion exchange fiber sheet is elementally processed into a pleated structure, a honeycomb structure, a corrugated structure, etc., and chlorine dioxide sterilization water such as pool water or bath water is brought into contact with the ion exchange fiber sheet in a parallel flow system. Water treatment method. |