| 摘要 |
PURPOSE:To treat raw water containing nitrate ions efficiently and at a low cost, in a removing method of the nitrate ions by ion exchange treatments/or biological treatment. CONSTITUTION:The raw water containing nitrate ions is passed through a tower 1 packed with an anion exchange resin 2 and the nitrate ions are adsorbed on the anion exchange resin 2. A denitrifying bacteria and a hydrogen devoting body are added to the anion exchange resin 2 adsorbed the nitrate ions to recover the anion exchange resin 2 biologically. Thus the nitrate ions adsorbed on the anion exchange resin is treated biologically by the denitrifying bacteria to efficiently recover the anion exchange resin. Waste water containing high concentration of nitrate ions and /or nitrite ions are not discharged, therefore injury of salt does not occur. |
