Study of the sustainability of the removal of H2S from biogas on a pilot scale through biofiltration
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The aim of this work was to study the sustainability of H2S removal from biogas at a pilot scale through biofiltration. To achieve this, the characterization of the support and biogas was carried out before and after the biofiltration process; the physical, chemical, and biological characteristics of the compost and critical properties such as porosity, density, moisture, pH, and microbial load were determined. At the end of the biofiltration process, an increase in moisture was observed, which hindered nutrient transmission and energy production through redox processes; the presence of elemental sulfur traces in the support demonstrated that at neutral pH, mass transfer of H2S from the gas phase to the liquid phase increased. It was concluded that: the design of the biofiltration system proposed for a Pilot Test yielded highly efficient removal results; the compost biofilter applied to the biogas production line under a flow rate of 0.5 L min-1 showed a high degree of adaptation to the inlet sulfide concentrations ranging from 2300 to 3700 ppmv; the richness of biomass present in the compost, its physicochemical composition, and buffering capacity allowed the process to conclude without acidification of the medium.
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