| 摘要 |
PURPOSE:To produce a pure water or the like high in purity by providing a supply part of feed water in the upper part of a mixed bed type ion exchange device and a 1st water collecting part of a treated water directly above a cation exchange resin in the lower part to prevent eluting ion from the resin. CONSTITUTION:The supply part 3 is provided in the upper part of the ion exchange device 1 packed with a mixed resin 2 of the cation exchange resin with an anion exchange resin and a water to be treated H0 is passed through the mixed resin 2. And the water collecting part 41 is provided directly above the lower part of the ion exchange device, at which the cation exchange resin is settled and gathered, where the water is collected. And a 2nd water collecting part 2 is provided downward of the water collecting part 41. Only the treated water obtained at the water collecting a part 41 in the upper part is transferred to the next process and the treated water at the water collecting part 2 in the lower part is returned to the preceding process. As a result, the sulfate ion separated by the cation exchange resin does not elute to the treated water and an extremely high purity water and hyperpure water are produced. |
