Patent ID: 6294097
Filing Date: 2001-09-25
Classification: C02F,Y10S

Abstract:
A method for treating waste water containing nitrate ions by subjecting the waste water to decomposition and oxidation to eliminate a harmfiul gas, said method comprising the steps of:(a) mixing a waste water containing 10% to 90% by weight nitrate ions in terms of ammonium nitrate with a lower alcohol having 1 to 4 carbon atoms to prepare a mixture, wherein an amount of said lower alcohol to be mixed is 10 to 50% by weight of a total amount of said waste water and said lower alcohol together,(b) spraying said mixture into a decomposition furnace held at a temperature of 250.degree. C. or higher to decompose said mixture to generate a decomposition gas, and(c) reacting said decomposition gas with a gas containing oxygen at a temperature of 250.degree. C. or higher to render said decomposition gas harmless.