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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/46752

    Título
    Biogas valorization via continuous polyhydroxybutyrate production by Methylocystis hirsuta in a bubble column bioreactor
    Autor
    Rodríguez Muñoz, YadiraAutoridad UVA Orcid
    Firmino, Paulo Igor Milen
    Pérez, Víctor
    Lebrero Fernández, RaquelAutoridad UVA Orcid
    Muñoz Torre, RaúlAutoridad UVA Orcid
    Año del Documento
    2020
    Editorial
    Elsevier
    Descripción
    Producción Científica
    Documento Fuente
    Waste Management, 2020, vol. 113, p. 395-403
    Resumo
    Creating additional value out of biogas during waste treatment has become a priority in past years. Biogas bioconversion into valuable bioproducts such as biopolymers has emerged as a promising strategy. This work assessed the operational feasibility of a bubble column bioreactor (BCB) implemented with gas recirculation and inoculated with a polyhydroxybutyrate (PHB)-producing strain using biogas as substrate. The BCB was initially operated at empty bed residence times (EBRTs) ranging from 30 to 120 min and gas recirculation ratios (R) from 0 to 30 to assess the gas-to-liquid mass transfer and bioconversion of CH4. Subsequently, the BCB was continuously operated at a R of 30 and an EBRT of 60 min under excess of nitrogen and nitrogen feast-famine cycles of 24 h:24 h to trigger PHB synthesis. Gas recirculation played a major role in CH4 gas–liquid transfer, providing almost fourfold higher CH4 elimination capacities (~41 g CH4 m−3 h−1) at the highest R and EBRT of 60 min. The long-term operation under N excess conditions entailed nitrite accumulation (induced by O2 limiting conditions) and concurrent methanotrophic activity inhibition above ~60 mg N-NO2− L−1. Adjusting the N-NO3− supply to match microbial N demand successfully prevented nitrite accumulation. Finally, the N feast-famine 24 h:24 h strategy supported a stable CH4 conversion with a removal efficiency of 70% along with a continuous PHB production, which yielded PHB accumulations of 14.5 ± 2.9% (mg PHB mg−1 total suspended solids × 100). These outcomes represent the first step towards the integration of biogas biorefineries into conventional anaerobic digestion plants.
    Materias Unesco
    23 Química
    33 Ciencias Tecnológicas
    Palabras Clave
    Bioplásticos
    Biorrefinería
    Bioplastics
    Biorefinery
    ISSN
    0956-053X
    Revisión por pares
    SI
    DOI
    10.1016/j.wasman.2020.06.009
    Patrocinador
    Ministerio de Ciencia e Innovación (grant BES-2016-077160) y (proyecto CTM2015-70442-R)
    Junta de Castilla y León y EU-FEDER (CLU 2017-09) , (UIC 526071) y (VA281P18)
    Version del Editor
    https://www.sciencedirect.com/science/article/abs/pii/S0956053X20303196
    Propietario de los Derechos
    © 2020 Elsevier
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/46752
    Tipo de versión
    info:eu-repo/semantics/acceptedVersion
    Derechos
    openAccess
    Aparece en las colecciones
    • IPS - Artículos de revista [156]
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    Biogas-valorization-via-continuous.pdf
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    Attribution-NonCommercial-NoDerivatives 4.0 InternacionalExceto quando indicado o contrário, a licença deste item é descrito como Attribution-NonCommercial-NoDerivatives 4.0 Internacional

    Universidad de Valladolid

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