| 摘要 |
PURPOSE:To efficiently remove an NH4<+> ion and a No3<-> ion, by applying wet thermal decomposition treatment to waste water containing ammonium nitrate, to which a COD component and, if necessary, ammonia were added, in the presence of a specific catalyst and a specific amount of oxygen under a specific condition. CONSTITUTION:Wet thermal decomposition treatment is applied to NH4NO3- containing water, to which a COD component was preliminarily added, not only in the presence of a catalyst comprising at least one of a noble metal, a noble metal ion and a soluble noble metal compound but also in the presence of oxygen in an amount below a theoretical oxygen amount necessary for decomposing the ammonia component, org. substance and inorg. substance in waste water. Further, if the temp. at the time of reaction is set to 100-370 deg.C and pH is adjusted to about 3-11.5 and, if necessary, ammonia is added to perform thermal decomposition, the removal ratio of an NH4<+> ion and a NO3<-> ion is enhanced to a large extent.
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