| 摘要 |
A strongly basic anionic ion exchange filter for denitrification and optionally softening of water is regenerated by contact successively in a first stage with a solution containing chloride ions and in a second stage with a solution containing sulphate or sulphate and hydrogen carbonate ions. If a cationic ion exchange filter for simultaneous softening of water is present, it may be regenerated by solutions from the anionic filter regeneration. The invention is applicable in water treatment for drinking purposes and in the production of beverages. Preferred sources of the chloride, sulphate, and hydrogen carbonate ions are NaCl, KCl, Na2SO4, K2SO4, NaHCO3, and KHCO3. |
