Patent ID: 7125531
Filing Date: 2006-10-24
Classification: B01D

Abstract:
1. A method for removing nitrogen oxide groups from waste material, said method comprising: providing a waste material comprising a nongaseous waste containing nitrogen oxide groups; providing a reaction vessel containing a fluidizable reaction bed and heating said reaction bed to an operating temperature; providing a fluidizing gas, at least one reductant and said waste material in said reaction bed wherein said fluidizing gas provides a gas velocity that agitates said waste material, fluidizes said reaction bed and elutriates fine solids from said fluidized reaction bed, wherein said fluidizing gas is provided in said fluidizable reaction bed via a fluidizing inlet, and wherein said waste material is provided in said fluidized reaction bed via a waste inlet; operating a first zone of said fluidized reaction bed under oxidizing conditions; and, operating a second zone of said fluidized reaction bed under reducing conditions so that said nitrogen oxide groups in said waste material are reduced at said operating temperature, thereby removing nitrogen oxide groups from said waste material and producing an inorganic residue and a gaseous effluent that together have substantially less nitrogen oxide groups than were present in said waste material.