Simultaneous Removal of Gaseous Elemental Mercury and Nox from Flue Gas Using Reactive Species

摘要

Removal of Nox and elemental mercury (Hg~0) with the reactive species produced from dielectric barrier discharge (DBD) and short wavelength ultraviolet (UV)-radiation was studied. We investigated the effect of operating parameters such as the applied voltage, residence time, initial concentration and co-existence of other pollutants. The removal of Hg~0 and NO gas was significantly promoted by an increase in the applied voltage of the DBD reactor system. It is meaningful to note that in a plasma reaction system, Hg~0 was oxidized at a lower applied voltage than NO in the gas. Short wavelength UV rays also effectively oxidized NO_x and Hg~0 to the easily treatable HNO_3 and HgO forms, respectively, due to the activity of ozone (O_3) and hydroxyl radicals (OH~·).