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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/46799

    Título
    Harvesting microalgal-bacterial biomass from biogas upgrading process and evaluating the impact of flocculants on their growth during repeated recycling of the spent medium
    Autor
    Rodero Raya, María del RosarioAutoridad UVA
    Muñoz Torre, RaúlAutoridad UVA Orcid
    Lebrero Fernández, RaquelAutoridad UVA Orcid
    Verfaillie, An
    Blockx, Jonas
    Thielemans, Wim
    Muylaert, Koenraad
    Praveenkumar, Ramasamy
    Año del Documento
    2020
    Editorial
    Elsevier
    Descripción
    Producción Científica
    Documento Fuente
    Algal Research, 2020, vol. 48, p. 101915
    Résumé
    Microalgal-bacterial consortium can be used to upgrade biogas by removing CO2 and H2S. Photosynthetic biogas upgrading requires harvesting microalgal-bacterial biomass in order to use the biomass-free cultivation medium as scrubbing liquid in the absorption column. In this study, the efficiency of different flocculants (Zetag 8125, cationically modified cellulose nanocrystals, Tanfloc, chitosan, and FeCl3) to harvest microalgal-bacterial biomass used for biogas upgrading in alkaline medium (inorganic carbon concentration up to 1800 mg L−1 and a pH ~10) was evaluated. Zetag and cationic cellulose nanocrystals resulted in maximum flocculation efficiencies of 95% (optimal dose 30 mg g−1) and 93% (optimal dose 20 mg g−1), respectively. Low flocculation was observed with other flocculants at doses as high as 200 mg g−1, which can be ascribed to the high pH of the alkaline medium. Zetag and cationic cellulose nanocrystals were selected for harvesting the biomass during semi-continuous cultivation of the microalgal consortium. Both Zetag and cationic cellulose nanocrystals were effective in flocculating the biomass with efficiencies of over 90% during five successive harvesting cycles. Gravity settling of the flocs formed by Zetag and cationic cellulose nanocrystals resulted in low biomass concentration factors of 7.7 and 2.0, respectively. Screening of flocs using a nylon mesh screen (pore size of 180 μm) resulted in a biomass concentration factor as high as 19.8. Zetag and cationic cellulose nanocrystals could be useful in harvesting biomass under high alkaline conditions without detrimental effects on biomass growth.
    Materias Unesco
    23 Química
    33 Ciencias Tecnológicas
    Palabras Clave
    Biogás
    Microalgas
    Floculación
    Microalgae
    Zetag
    ISSN
    2211-9264
    Revisión por pares
    SI
    DOI
    10.1016/j.algal.2020.101915
    Patrocinador
    Junta de Castilla y León y programa EU-FEDER (CLU 2017-09) y (UIC 071)
    FWO-NRF cooperation project (VS00218N)
    European Union's Horizon 2020 research and innovation programme under grant agreement no 751637
    Patrocinador
    info:eu-repo/grantAgreement/EC/H2020/751637
    Version del Editor
    https://www.sciencedirect.com/science/article/pii/S2211926419312810
    Propietario de los Derechos
    © 2020 Elsevier
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/46799
    Tipo de versión
    info:eu-repo/semantics/acceptedVersion
    Derechos
    openAccess
    Aparece en las colecciones
    • IPS - Artículos de revista [156]
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    Harvesting-microalgal-bacterial-biomass.pdf
    Tamaño:
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    Attribution-NonCommercial-NoDerivatives 4.0 InternacionalExcepté là où spécifié autrement, la license de ce document est décrite en tant que Attribution-NonCommercial-NoDerivatives 4.0 Internacional

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