A denitrogenation system for the waste water from thermal power plants containing a high concentration of ammonia was developed as a substitute for conventional biochemical systems.Ammonia stripped from the waste water is oxidized with oxygen (air) into nitrogen in an oxidation reactor packed with Fe/Ag/TiO{sub}2 newly developed and V/TiO{sub}2 catalysts. The reactor was designed on the basis of a simulation using kinetic data ofthe catalysts and a gas mixing theory on throat type venturi. The performance of the pilot plant equipped with the reactor was demonstrated using actual waste water containing ammonia of more than 2000 mg/L as nitrogen. The emissions were less than 10 ppm for NH{sub}3 and less than 50 ppm for NOx and N{sub}2O as well as the nitrogen concentration water of less than 60 mg/L.
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