Study of clay materials rich in iron oxides for the desulfurization of biogas

 

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Detalles Bibliográficos
Autores: Ulloa-Solano, Fiorella, Chaves-Flores, Marco, Urvina-Savelli, Luis Andres, C. Villarreal, Claudia
Formato: artículo original
Fecha de Publicación:2022
Descripción:Costa Rica could generate 1,000,000 m3 of methane daily from biogas, but its use as energy source requires the application of desulfurization processes, for which the filtering materials are costly and not locally-sourced. The use of natural filtering substrates that are rich in iron oxides, like clay soils (SR) and red rocks (RR), for the removal of H2S from biogas was studied. The performance of the filter materials was tested in an anaerobic biodigestion system installed in a swine farm, with a daily biogas production of 20-30 m3, 70% methane. Six samples were initially analyzed by X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) to quantify the iron oxides (Fe2O3) and two RR samples with the highest percentage of Fe2O3 were selected, RR2 with 4.8% w/w and RR3 with 7.2% w/w. The characterization of the filter media, before and after its use as a filter, was carried out using Scanning Electron Microscopy (SEM), X-Ray Energy Dispersion Spectroscopy (EDS), and XRD combined with Rietveld´s method (XRD-Rietveld). The absorption of sulfur was confirmed and a decrease of 4.8% w/w to 1.1% w/w of the Fe2O3 present in the RR was measured in the RR after applying it in the desulfurization process. The RR with a particle size between 2.4- 6.3 mm can remove up to 28% of H2S. The low efficiency of H2S removal suggests the search for other minerals that have higher fraction of iron oxides, to improve the desulfurization efficiency.
País:RepositorioTEC
Institución:Instituto Tecnológico de Costa Rica
Repositorio:RepositorioTEC
Lenguaje:Español
OAI Identifier:oai:repositoriotec.tec.ac.cr:2238/14134
Acceso en línea:https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/6338
https://hdl.handle.net/2238/14134
Palabra clave:Clays
biogas cleaning
desulfurization
anaerobic biodigestion
iron oxides
biorefining
Arcillas
limpieza de biogás
desulfuración
biodigestión anaerobia
óxidos de hierro
biorrefinación