| 摘要 |
545,842. Purifying water. PERMUTIT CO., Ltd. Dec. 14, 1940, No. 17689. Convention date, June 14. Drawings to Specification. [Class 46] In regenerating a water-treatment plant comprising a cation-exchange material charged with hydrogen ions and an acid-removal material, arranged in series, the latter part of the water used for washing the acid-removal material is recycled through both materials. Apparatus is described comprising separate containers for the cation-exchange and acidremoval materials with the usual connections for back-flushing, regeneration and to waste and a connection with pump and non-return valve from the outlet of the container for the acid-removal material to the inlet of the container for the cationexchange material. |
