Technical Bulletin No. 0058: Reactions of Ozone with Reduced Sulfur Compounds Present in Kraft Mill Gaseous Emissions (AQTB)

The attached technical bulletin is based on a thesis investigation conducted by M. L. Tuggle on a National Council research assistantship in the Department of Environmental Engineering at the University of Florida. Noting that ozone ha swell-recognized chemical oxidation properties and has found limited use in both water and air pollution control applications. Tuggle explored the stoichiometry and kinetics of the oxidation reaction of ozone with the four principal odorous reduced sulfur compounds associated with kraft mill air pollution problems. Tuggle concluded that dosages at least twice those theoretically indicated were required for complete oxidation of several compounds, and that reaction times far in excess of exit stack residence time were needed for such oxidation reactions to proceed. Reactions were accelerated at elevated temperatures in spite of the reported possibility of thermal decay. While ozone was reported as having some chemical effectiveness in oxidizing reduced sulfur compounds, the results obtained in these gas-phase laboratory studies remain to be analyzed further to determine whether pilot investigations are in order. This review will examine current knowledge concerning completeness of reaction, reaction time requirements, ozone costs, and effectiveness at various reduced sulfur compound concentrations.