Removal of Gaseous Hydrogen Sulfide by a Photo-Fenton Wet Oxidation Scrubbing System

Abstract

In this article, a photo-Fenton wet oxidation scrubbing system was used to remove and oxidize gaseous hydrogen sulfide in an ultraviolet (UV)-bubbling column scrubber. The technical feasibility of the removal process of gaseous hydrogen sulfide using a wet oxidation scrubbing system was verified, and the effect of technological parameters (hydrogen peroxide concentration, UV-light power, ferrous ion concentration, pH value of solution, mixed gas flow rate, reaction temperature, and hydrogen sulfide concentration) on the removal of hydrogen sulfide was researched. Research on removal products and the mechanism of hydrogen sulfide removal was also carried out. Related results showed that a rise in UV-light power and hydrogen peroxide concentration enhanced the removal of hydrogen sulfide. The rise of the hydrogen sulfide concentration, mixed gas flow rate, and reaction temperature weakened the removal of hydrogen sulfide. With the increase of the ferrous ion concentration or pH value of solution, hydrogen sulfide removal efficiency increased at first and then decreased. Hydrogen sulfide was removed through four paths, and the •OH oxidation was verified as the leading removal path.

A cleaner application on hydrogen sulfide

“…Thus, the high gas-liquid ratio improves the H2S conversion percentage. This increasing trend in our work was found to be similar [20] As a result, it was evident that an increase in liquid-gas ratio shows a significant increase in H2S conversion. However, since more liquid-gas ratio needs more investment, the most appropriate liquid-gas ratio should be determined by considering efficiency and energy costs.…”

“…The removal of H2S gas was investigated [4], who examined the conversion of H2S from generating coal mining area. Another interesting study was published [20], who studied the conversion of H2S in the presence of UV radiation as a catalyst in order to remove of H2S. However, the studies related to remove H2S from the gas phase using the Fenton process are very scarce.…”

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H2SO4/H2O2

“…The typical dry method mainly includes adsorption separation using various adsorbents (such as activated carbon, molecular sieve, graphene material, metal organic framework), plasma degradation, photocatalytic oxidation, photochemical removal, ozonization 7–12, etc. The typical wet method is represented by solution absorption (such as ethanolamine solution, sodium carbonate solution, ionic liquids, complexing agents 13–15), biological technology (such as biofilter, biological trickling filter, membrane biological scrubber 16–18), catalytic oxidation, new free radicals advanced oxidation absorption techniques, etc. 19–23.…”

“…19–23. Moreover, some new wet methods such as Fenton‐like reagents, and photo‐Fenton wet oxidation have been developed 9, 13. These methods have good prospects in some aspects but most of them still have disadvantages such as low removal efficiency, relatively high cost, corrosiveness, and environmental pollution.…”

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

“…Relevant results ,,− have shown that ultraviolet (UV)-light can effectively decompose PS and PMS to generate SO 4 • – radicals (see Table ). Photochemical SO 4 • – -based AOTs have received extensive attention in pollution control field owing to simple and green process, high reagent utilization, and free radical yield. ,,− Liu et al proposed a NO removal process using UV (254 nm)/PS AOT in an UV-impinging stream reactor with vertical lamp tubes, and studied the performance, mechanism and mass transfer-reaction kinetics of NO removal using this technology. Their results indicated that the removal efficiency of NO reached 90.6%, and SO 4 • – and •OH were confirmed as the major active species for NO removal.…”