| 摘要 |
Water of low solids content is purified by ion exchange treatment in separate beds with anion and cation exchange resins, the rate of flow of water through the last bed at least being fast. The beds are usually shallow and the flow rate through the last bed at least, and generally through all the beds, is generally at least 100 metres per hour. Apparatus suitable for use in such a process comprises a tower (14) including supports (15, 16, 17) for holding the beds (9, 10, 11) one above the other and means (6, 7) for passing the water to be treated vertically through the tower. The apparatus is also suitable for use in other processes for purification of water of low solids content by ion exchange. |
