RT info:eu-repo/semantics/article
T1 Assessment of the mass transfer strategy and the role of the active bacterial population on the biological degradation of siloxanes
A1 Pascual, Celia
A1 Cantera Ruiz de Pellón, Sara
A1 Muñoz Torre, Raúl
A1 Lebrero Fernández, Raquel
K1 Ingeniería química
K1 Renewable and Green Energy
K1 Biogas upgrading
K1 Biotrickling filter
K1 Silicon oil
K1 Mejoramiento de biogás
K1 Filtro biopercolador
K1 Aceite de silicona
K1 3308 Ingeniería y Tecnología del Medio Ambiente
K1 3303 Ingeniería y Tecnología Químicas
AB 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.
PB Elsevier
SN 0016-2361
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/59768
UL https://uvadoc.uva.es/handle/10324/59768
LA eng
NO Fuel, 2023, vol. 350, 128851
NO Producción Científica
DS UVaDOC
RD 14-oct-2024