Method for treating waste water containing nitrate ions
AssigneeAnan Kasei Co., Ltd.
InventorsMichiya Ohashi, Yoshimasa Katayama
Life of this patent
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Abstract
There is disclosed a method for treating waste water containing nitrate ions by subjecting the waste water to decomposition and oxidation to eliminate a harmful gas, the method including 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, (b) decomposing the mixture at a temperature of 250° C. or higher to generate a decomposition gas, and (c) reacting the decomposition gas with a gas containing oxygen at a temperature of 250° C. or higher to render the decomposition gas harmless.
Claims5
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° 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° C. or higher to render said decomposition gas harmless.
Dependencies are inferred from the claim text.