| 摘要 |
PURPOSE:To improve washing properties by arranging the waste regenerating solution discharge pipe of a regeneration tower under the separation interface of an upper anion exchange resin and a lower cation exchange resin and passing an acid and alkali through the ion exchange resins. CONSTITUTION:For example, a column is packed with a cation exchange resin 2 so as to exceed a discharge pipe 3 by 5cm or more and, subsequently, the upper part of the column is packed with a cation exchange resin 1 in an amount half that of the anion exchange resin 1. After packing, a 5% NaOH solution is passed through the column from the upper part thereof and pure water is passed therethrough from the lower part thereof to regenerate the anion exchange resin 1 and, continuously, pure water is passed through the column from the upper and lower parts thereof to wash the ion exchange resins. Next, a 5% HCl solution is passed through the column from the lower part thereof and pure water is passed therethrough from the upper part thereof to regenerate the cation exchange resin 2 and, continuously, pure water is passed through the column from the upper and lower parts thereof for 30min to wash the ion exchange resins. By this method, washing properties can be improved. |
