Simultaneous removal of NO and SO2 from coal-fired flue gas by UV/H2O2 advanced oxidation process

Simultaneous removal of NO and SO2 from coal-fired flue gas by UV/H2O2 advanced oxidation process (AOP) was studied in an ultraviolet (UV)-bubble column reactor. Effects of UV lamp power and H2O2 concentration on NO and SO2 removal efficiencies were studied. The results showed that under all conditions, SO2 achieved 100% removal; between UV and H2O2 had a significant cooperative effect, and the cooperative factor reached 6.0; The NO removal was enhanced with the increase of H2O2 concentration or UV lamp power; The ion products in solution were analyzed with ion chromatography (IC), and the material balances for NO and SO2 were calculated. The reaction pathways of removal of NO and SO2 by wet scrubbing with UV/H2O2 were also preliminarily discussed.