Abstract
Removal of gaseous hydrogen sulfide using Fenton solution in a spraying tower was studied systematically. The effects of several key running parameters such as H2O2 concentration, Fe2+ concentration, reaction temperature, solution pH value, hydrogen sulfide concentration and liquid-gas ratio on hydrogen sulfide removal were investigated. Products, free radicals and mechanism of hydrogen sulfide removal were also studied. The results show that an increase in Fe2+ concentration, liquid-gas ratio or solution pH value can increase removal efficiency of hydrogen sulfide. Increasing hydrogen sulfide concentration can reduce removal efficiency of hydrogen sulfide. H2O2 concentration and reaction temperature have double influence on hydrogen sulfide removal removal efficiency. Hydrogen sulfide removal by oxidation of hydroxyl radical (OH) is the main removal pathways. Hydrogen sulfide removal by oxidation of H2O2 and hydrolysis reaction are the secondary removal pathways. The main oxidation products of hydrogen sulfide removal are sulphuric acid and elemental sulfur in solutions.
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