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    Título
    The impact of externally added hydrogen gas on microbial electrosynthesis from CO2
    Autor
    Mateos González, RaúlAutoridad Buleria ORCID
    San Martín Bécares, Isabel
    Sotres, Ana
    Escapa, Adrián
    Morán, Antonio
    Facultad/Centro
    Instituto de Medio Ambiente, Recursos Naturales y Biodiversidad de la Universidad de Léon
    Área de conocimiento
    Ingenieria Quimica
    Datos de la obra
    ISMET 6. General Meeting of the International Society for Microbial Electrochemistry and Technology, 3rd-5th October, 2017, Lisboa
    Fecha
    2017
    Abstract
    Hydrogen is a key versatile biomolecule in microbial electrosynthesis (MES). It can be directly produced by electrolysis to be used as an intermediate, directly biosynthesize by electroactive microorganisms from protons and electrons, or externally added to drive other bioelectrochemical or biological reactions. The aim of this study is to bring further understanding on how externally added hydrogen impacts product formation on MES. Two double-chamber microbial electrolysis cells were built in 500mL modified Schott-Duran bottles (Figure 1A). The cathode consisted of a 175 cm2 carbon felt (+1V vs. Ag/AgCl) and a platinum wire was used as counter electrode. The cathode was inoculated according to the procedure detailed in Bajracharya et al. 2017, and following the acclimation period the biocathode was fed with a gas mixture containing 20% H2 / 20% N2 / 60% CO2. After 2 weeks of operation hydrogen was removed from the feed ( 20% N2 / 80% CO2). When the cell was fed with the hydrogen-containing mixture, acetate and ethanol concentrations (Figure 1B) grew steadily with time (composition ratio around 1:1 (w/w)). This behavior suggested that hydrogen was acting as a reducing agent driving direct production of ethanol, or even its production from acetate. However, when hydrogen was removed from the feed, ethanol concentration declined, while acetate concentration sharply increased showing CO2-acetate selectivities near 100%. These results indicate how ethanol production is highly dependent on externally-added hydrogen, while the synthesis of acetate only requires the cathode as a source of electrons. A.Sotres thanks “Junta de Castilla y Leon” for postdoctoral contract associated to project ref: LE060U16, cofinanced by FEDER funds
    Materia
    Ingeniería química
    Palabras clave
    Bioprocesos
    CO2
    Bio-cátodos
    Síntesis electro-microbiana
    Electrosíntesis
    Idioma
    eng
    Tipo documental
    info:eu-repo/semantics/conferenceObject
    Subtipo documental
    info:eu-repo/semantics/conferenceObject
    URI
    http://hdl.handle.net/10612/8453
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    • Comunicaciones a congresos, conferencias, etc. [762]
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