Simultaneous Removal of SO2 and NOx from Flue Gas by Liquid-Phase Catalytic Oxidation-Biological Purification Method

The test study on the removal of SO₂ and NOx simultaneously from flue gas by a new-type method was performed. The results showed that the purification efficiency of SO₂ and NOx in flue gas could reach at 97% and 67% respectively under the optimum operation condition of liquid-phase catalytic oxidation-biological purification system. The bacteria in biofilms may have stronger resistance to the catalytic metal ions. The relativity between concentrations of SO₂ and NOx in flue gas was dramatic. Adding nutrient solution to the system could improve the removal efficiency. Six typical bacteria were achieved in the predominant bacterium crowd of liquid-phase catalytic oxidation-biological purification system. The purifying mechanism of this system was also be discussed, it laid a good foundation for exploring the new-type technology method, with a brand-new concept of "chemical catalyzing - bio-treating", to removing SO₂ and NOx from flue gas simultaneously.