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Título
Microbial electromethanogenesis for energy storage: Influence of acidic pH on process performance
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Journal of Energy Storage
Datos de la obra
Pelaz, G., Carrillo-Peña, D., Morán, A., & Escapa, A. (2024). Microbial electromethanogenesis for energy storage: Influence of acidic pH on process performance. Journal of Energy Storage, 75, 109685. https://doi.org/https://doi.org/10.1016/j.est.2023.109685
Editor
Elsevier
Fecha
2024
ISSN
2352-152X
Zusammenfassung
[EN] Microbial electromethanogenesis (EM) has positioned itself as a promising technology for electrical energy storage using CO2 as a feedstock. However, the selectivity of the final product remains a challenge, being highly dependent of the operating conditions (temperature, pH, conductivity, etc.). This study tries to understand the role that pH plays on the start-up, performance and the structure of microbial communities of an EM system. To that end, two EM reactors were started at pH 7.0 and 5.5 respectively and were subsequently subjected to pH variations between 7.5 and 3.5. The reactor inoculated at pH 5.5 started to produce CH4 earlier than that inoculated at pH 7.0, and the acetogenic activity was gradually displaced by methanogenesis during the start-up period, regardless of the pH. In addition, as the pH of the catholyte became more acidic, the performance improved in terms of methane production, current density and columbic efficiency. Acidic environments – pH around 4.5 – promoted higher methane production due to the selection of Methanobacterium, an acid-tolerant hydrogenotrophic archaea. When pH was set at 3.5, the overall performance declined sharply, probably because it induced unfavourable physiological conditions.
Materia
Palabras clave
Peer review
SI
ID proyecto
- info:eu-repo/grantAgreement/AEI/Programa Estatal de I+D+i Orientada a los Retos de la Sociedad /PID2020-115948RB-I00/ES/AVANZANDO HACIA EL USO DE TECNOLOGIAS ELECTROQUIMICAS MICROBIANAS COMO NEXO ENTRE LOS SISTEMAS ENERGETICOS Y LAS INSTALACIONES DE TRATAMIENTO DE RESIDUOS/Acrónimo del proyecto
URI
DOI
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