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Título
Assessment of the mass transfer strategy and the role of the active bacterial population on the biological degradation of siloxanes
Año del Documento
2023
Editorial
Elsevier
Descripción
Producción Científica
Documento Fuente
Fuel, 2023, vol. 350, 128851
Zusammenfassung
Upgrading of biogas to remove siloxanes is mandatory to meet the standards required for its use as a substitute of fossil fuels. The biological degradation of these pollutants is a low cost and environmental friendly alternative to conventional techniques, albeit certain limitations, such as the low solubility of siloxanes, still hinder its application. In the present work, two parameters were optimized in aerobic and anoxic two-phase biotrickling filters (TP-BTF): the trickling liquid velocity (TLV) and the internal gas recirculation, with the aim of improving siloxanes biological removal. The results obtained showed that the increase in TLV from 2 to 10 m h−1 resulted in higher removal efficiency (RE) under both anoxic and aerobic conditions, reaching maximum values of 55 and 47%, respectively. This effect was more significant for the linear siloxanes. On the contrary, a further increase in the TLV to 20 m h−1 together with the implementation of internal gas recirculation caused an excessive turbulence in the liquid side, detaching the biofilm and having a negative effect for the RE. The cyclic siloxanes were more effectively eliminated along the process (maximum REs of 75% were recorded for decamethylcyclopentasiloxane (D5)), but the studied system modifications exerted a minor effect on their RE. The active bacterial population involved in siloxanes degradation (studied throughout RNA extraction and sequencing) was dominated by the clade Acidithiobacillacea KCM-B-112 and the genus Parvibaculum in aerobic conditions, while the members of the family Phyllobacteriacea and the genera Nocardia and Baekduia dominated in anoxic conditions.
Materias (normalizadas)
Ingeniería química
Renewable and Green Energy
Materias Unesco
3308 Ingeniería y Tecnología del Medio Ambiente
3303 Ingeniería y Tecnología Químicas
Palabras Clave
Biogas upgrading
Biotrickling filter
Silicon oil
Mejoramiento de biogás
Filtro biopercolador
Aceite de silicona
ISSN
0016-2361
Revisión por pares
SI
Patrocinador
European Union’s Horizon 2020 research and innovation program under grant agreement No 745785
Junta de Castilla León - EU-FEDER (CLU 2017-09, CL-EI-2021-07 y UIC 315)
European Commission-H2020- MSCA-IF-2019 grant (ENHANCEMENT, ref. 897284)
Junta de Castilla León - EU-FEDER (CLU 2017-09, CL-EI-2021-07 y UIC 315)
European Commission-H2020- MSCA-IF-2019 grant (ENHANCEMENT, ref. 897284)
Patrocinador
info:eu-repo/grantAgreement/EC/H2020/745785
info:eu-repo/grantAgreement/EC/H2020/897284
info:eu-repo/grantAgreement/EC/H2020/897284
Propietario de los Derechos
© 2023 The Authors
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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