Simultaneous Oxidation and Absorption of NOx and SO2 in an Integrated O3 Oxidation/Wet Atomizing System

The simultaneous removal of NO x and SO 2 was demonstrated by an integrated O 3 oxidation/wet atomizing system. The dielectric barrier discharge with silicone rubber dielectrics was used for generating O 3 to oxidize NO and SO 2 . The O 3 yield and O 3 energy yield were evaluated to be 13.3 g/h and 53.7 g/kWh, respectively. NO was effectively oxidized by O 3, while SO 2 was not significantly oxidized because the reaction rate of NO oxidation was much higher than that of SO 2 . The highest oxidation efficiencies of NO and SO 2 were 97 and 8%, respectively. NO x and SO 2 were absorbed as aqueous ions with a mist of H 2 O 2 solution supplied by an ultrasonic humidifier. The total removal efficiencies of NO x and SO 2 were 88.8 and 100%, respectively. NO and SO 2 were oxidized to NO 2, HNO 3, N 2 O 5, and SO 3 by O 3 . These species were absorbed to form NO 3 –, HSO 3 –, and SO 4 2– by reactions with the H 2 O 2 solution.