| 摘要 |
PURPOSE:To treat waste water efficiently for a long period of time, by oxidizing waste water containing COD components in wet manner under specific conditions, using catalysts containing compound oxides of titanium and silicon, and oxides of lanthanoids, as catalyst components. CONSTITUTION:Catalysts for wet oxidation, comprising a component composed of compound oxides of titanium and silicon such as TiO2-SiO2 etc.; a component composed of oxides of lanthanoids such as, at least, one kind of oxide selected from a group composed of lanthanum, cerium or neodymium; and a component composed of manganese etc., are used. Waste water containing COD component is oxidized in wet manner at a reaction temperature of 370 deg.C or lower, usually 100-370 deg.C, under a pressure high enough for the waste water to keep liquid phase in a reaction column, i.e., 1-about 200kg/cm<2>, with feed gases containing molecular oxygen having a quantity of 1-1.5 times a theoretical oxygen required for decomposing organic and inorganic substances contained in the waste water. |
