Patent ID: 6280694
Filing Date: 2001-08-28
Classification: A62D,B01D,C02F

Abstract:
A method for converting nitrogen oxides, said method comprising the steps of:providing a waste feed containing nitrate;heating a reaction vessel containing a bed to an operating temperature of at least 400.degree. C. but below the volatilization temperature of any metal ions in said waste feed;injecting superheated steam, oxygen, reductants and waste material into said reaction vessel, wherein said superheated steam is injected at a velocity that agitates said waste material and elutriates fine solids from said bed;operating a portion of said bed in reducing conditions so that substantially all of said nitrate in said waste material is reduced at said operating temperature thereby eliminating substantially all of the nitrogen oxides present in such waste material and leaving an inorganic solid residue low in nitrates and a gaseous effluent low in nitrogen oxides.