Biogas purification by a chemical absorption and biological oxidation process
2022
Ibrahim, Rania | Navaee-Ardeh, Shahram | Cabana, Hubert
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.
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