| 摘要 |
PURPOSE:To efficiently decompose NH4<+> and NO3<-> ions, by performing the wet thermal decomposition treatment of waste water containing ammonium nitrate or the same waste water containing a COD component in the presence of a specific catalyst and oxygen-containing gas. CONSTITUTION:In the treatment of waste water discharged from an uranium stock material treatment process, said waste water is held in the presence of a supported catalyst containing at least one of ruthenium, rhodium, platinum and compounds thereof as an active component. Further, the waste water is subjected to wet thermal decomposition in the presence of oxygen in an amount 1-1.5 times a theoretical oxygen amount necessary for decomposing the ammonia, org. substance and inorg. substance in the waste water into N2, H2O and CO2 under a pH condition of 3-8 at 100-370 deg.C. Further, in this treatment, if a COD component is preliminarily added to perform the wet thermal decomposition of waste water containing NH4NO3 in the same way, decomposition efficiency is enhanced still more.
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