The Removal of Hydrogen Sulfide from Biogas in a Microaerobic Biotrickling Filter Using Polypropylene Carrier as Packing Material
2015
Zhou, Qiying | Liang, Hong | Yang, Senlin | Jiang, Xia
Biological removal of hydrogen sulfide in biogas is an increasingly adopted alternative to the conventional physicochemical processes, because of its economic and environmental benefits. In this study, a microaerobic biofiltration system packed with polypropylene carrier was used to investigate the removal of high concentrations of H₂S contained in biogas from an anaerobic digester. The results show that H₂S in biogas was removed completely under different inlet concentrations of H₂S from 2065 ± 234 to 7818 ± 131 ppmv, and the elimination capacity of H₂S in the filter achieved about 122 g H₂S/m³/h. It was observed that the content of CH₄in biogas increased after the biogas biodesulfurization process, which was beneficial for the further utilization of biogas. The elemental sulfur and sulfate were the main sulfur species of H₂S degradation, and elemental sulfur was dominant (about 80 %) under high inlet H₂S concentration. The results of terminal restriction fragment length polymorphism (T-RFLP) and fluorescence in situ hybridization (FISH) show that the population of sulfide-oxidizing bacteria (SOB) species in the filter changed with different concentrations of H₂S. The microaerobic biofiltration system allows the potential use of biogas and the recovery of elemental sulfur resource simultaneously.
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