Abstract
With the increasing industrial production, there was a significant number of toxic and harmful hydrogen sulfide (H2S) gas generated. Due to the industrial activities, converting H2S gas from the waste of industrial process is environmentally attractive. This paper focuses on the conversion of H2S to elemental sulfur (S°) and other sulfur species (i.e., sulfite ion (SO32-); sulfate ion (SO42-) using Fenton reagent. The effects of some reaction parameters such as Fe2+ ion concentration, amount of hydrogen peroxide (H2O2), reaction time, initial H2S concentration and, liquid-gas ratio on H2S conversion percentage were explored thoroughly. The results revealed that the increase of the Fe2+ ion concentration and H2O2 quantity could promote the conversion of H2S. Besides, the comparable results were recorded for each reaction parameter. An apparent positive effect was observed with increasing the amount of H2O2 on H2S conversion. However, the conversion percentage was decreased while increased in the initial concentration of the H2S in the Fenton reactor. It was well accepted that the main conversion pathway of H2S was hydroxyl radical (•OH). Additionally, the oxidative reaction of H2O2 on H2S is thought another removal pathway. The expected products are sulphuric acid and S°.
Highlights
Hydrogen sulfide (H2S) is highly toxic, poisonous, corrosive, and, flammable
The precipitated solid characterization showed that the elemental sulfur was found as a significant compound in the conversion of H2S by the Fenton process. These results presented that the Fenton process can be applied for pollution control, and sustainable products are quickly recovered from wastewater for a circular economy prospect
Without Fenton reaction, the H2S conversion percentage was recorded at 8.9% via H2O2
Summary
Hydrogen sulfide (H2S) is highly toxic, poisonous, corrosive, and, flammable. It is with the characteristic foul odor of rotten eggs. The biotechnological method primarily comprises biochemical processes such as thiobacillus sp., thermothrix azorensis, and thiothrix nivea, thioalkalispira microaerophila, cholorobium limicola [10,11,12,13]. In these processes, the conversion of H2S and other sulfur compounds has been widely provided by a bacterium. The H2S conversion efficiency of these methods shows promising results in some respects, but some problems still have been observed These processes require high investment costs and equipment corrosion occurs during the process. It was summarized in equation 1 [10, 14]
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