Patent ID: 8425866

Claim:
A method of treating a gas stream for removal of at least oxides of nitrogen, the method comprising: a) oxidizing the gas stream in an oxidizer including: i) generating chlorine dioxide in a continuous reaction process; ii) diluting the chlorine dioxide with air or inert gas concurrent with generating the chlorine dioxide; iii) mixing the diluted chlorine dioxide with the gas stream upon generation into the oxidizer to convert nitric oxide to nitrogen dioxide; and iv) maintaining a desired level of nitric oxide in the gas stream by regulating a generation rate of the chlorine dioxide; b) after oxidizing the gas stream, scrubbing the gas stream in a scrubber including: i) reacting the gas stream with a hydrogen peroxide solution to convert nitrogen dioxide to nitric acid in an acidic hydrogen peroxide scrubber liquor, thereby producing a first scrubber liquor; ii) maintaining a desired hydrogen peroxide concentration in the first scrubber liquor by regulating a flow of the first hydrogen peroxide solution; and iii) removing a stream containing the nitric acid in the acidic hydrogen peroxide scrubber liquor from the scrubber.