RT info:eu-repo/semantics/article
T1 Microbial electromethanogenesis for energy storage: Influence of acidic pH on process performance
A1 Pelaz Guerra, Guillermo
A1 Carrillo Peña, Daniela Andrea
A1 Morán Palao, Antonio
A1 Escapa González, Adrián
A2 Algebra
K1 Ingeniería química
K1 Power to gas
K1 Bioelectrochemical system
K1 Electromethanogenesis
K1 Biocathode
K1 Methane
K1 3303 Ingeniería y Tecnología Químicas
AB [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.
PB Elsevier
SN 2352-152X
LK https://hdl.handle.net/10612/17437
UL https://hdl.handle.net/10612/17437
NO 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
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 02-jun-2024