| 摘要 |
PURPOSE:To provide a filter capable of simultaneously removing a particle and an ion by winding ion exchange fibers around a cylindrical porous holder in a layered state to form a filter and adding a regeneration and backwashing mechanism to the filter. CONSTITUTION:Anion and cation exchange fibers 17 are wound around a cylindrical element 11 in a reel form and polymeric fibers 18 are further wound around the outermost part of the element to form a filter 16. A part of iron oxide particles is collected by the ion exchange fibers 17 between the polymeric fibers 18 of the outermost part while the cations among dissolved ions are adsorbed by the cation fibers and the anions among them are adsorbed by the anion fibers. The filter 16 is incorporated to constitute a module 19 and inflow water is introduced into the lower part of the module 19 to be allowed to flow out of the module 19. When the filter 16 has a predetermined pressure difference, high pressure air is injected into the module from the outside to separate the ions. When ion exchange capacity is lowered, the cation fibers are regenerated by an acidic soln. while the anion fibers are regenerated by an alkali soln. and, thereafter, the residue is washed off by washing water. |
