| 摘要 |
PURPOSE:To enable efficient removal of colloidal materials which cannot be removed by a membrane sepn. by sealing pure water with gaseous oxygen in a primary pure water tank. CONSTITUTION:The pure water obtd. by subjecting the raw water to a flocculating and settling treatment, then removing the ion-component thereof by cation and anion exchange resins and removing high-polymer org. matter and colloidal materials is transiently stored in the primary pure water tank 80 and water is refined from said tank 80, by which the pure water is prepd. The sealing in the primary pure water tank 80 is executed by using the gaseous oxygen at this time and by supplying the gaseous oxygen into the tank 80 by a bubbling method of good gas-liquid contact. As a result, the colloidal materials which cannot be removed by the membrane sepn. are removed with good efficiency as well. The ionic materials are further removed in the form of solid by partial oxidation. |
