Abstract
Abstract In this article, a novel gaseous hydrogen sulfide (H2S) removal technology using ultraviolet/Oxone-induced oxidation scrubbing system in a lab-scale photochemical impinging stream scrubber was proposed. The effects of main influencing factors (ultraviolet radiation intensity, Oxone concentration, solution pH, reaction temperature, solution circulation rate, gas flow rate and H2S concentration) on H2S removal, and the products and mechanism of H2S removal were studied systematically. It is found that the highest H2S removal efficiency can reach 98.9% under optimal experimental conditions. An increase in ultraviolet radiation intensity, Oxone concentration or solution pH increases H2S removal efficiency. The increase of reaction temperature, gas flow rate or H2S concentration reduces H2S removal efficiency. Increasing solution circulation rate first increases and then decreases H2S removal efficiency. Ionization, Oxone oxidation, photolysis and free radical oxidation are found to be the four main pathways in the H2S removal. The SO4− and OH are found to be the major active species, and play leading roles in the H2S removal. Sulphur and sulfate are the main removal products in reaction solution.
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