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Biogas purification by a chemical absorption and biological oxidation process
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Biogas purification by a chemical absorption and biological oxidation process
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Journal Article
Biogas purification by a chemical absorption and biological oxidation process
2022
Overview
Abstract Due to its toxicity and corrosiveness, removal of hydrogen sulfide (H2S) from landfill biogas is essential in terms of environmental impacts and biogas valorization. This study evaluates the performance of a chemical-biological oxidation process for the purification of biogas. The treatment process consists of two separate phases. The first phase targets the elimination of 50 ppmv H2S concentration from the gaseous stream by ferric sulfate solution in the chemical absorption/oxidation reactor. This technique was 100% efficient for removing the H2S at 15 g L−1 ferric iron concentration and empty bed residence time of 7 min. The model validation indicated that the mass transfer limitation is the rate-determining phase in the chemical treatment process. Then, in the second phase, biological oxidation of the produced ferrous sulfate into ferric sulfate took place. The oxidation rates of up to 1 g Fe2+ L−1 h−1 and 0.8 g Fe2+ L−1.h−1 were achieved in the biological oxidation process with and without adding 0.1% w/v glucose, respectively.
