RT info:eu-repo/semantics/article
T1 Elucidating the impact of power interruptions on microbial electromethanogenesis
A1 Pelaz Guerra, Guillermo
A1 González González, Rubén
A1 Morán Palao, Antonio
A1 Escapa González, Adrián
A2 Ingenieria Electrica
K1 Ingeniería química
K1 Electromethanogenesis
K1 Power-to-gas
K1 Hydrogen
K1 Methane
K1 Biocathode
AB [EN] The need to accommodate power fluctuations intrinsic to high-renewable systems willdemand in the future the implementation of large quantities of energy storage capacity.Electromethanogenesis (EM) can potentially absorb the excess of renewable energyand store it as CH4. However, it is still unknown how power fluctuations impact on theperformance of EM systems. In this study, power gaps from 24 to 96 h were applied totwo 0.5 L EM reactors to assess the effect of power interruptions on current density,methane production and current conversion efficiency. In addition, the cathodes whereoperated with and without external H2 supplementation during the power-off periods toanalyse how power outages affect the two main metabolic stages of the EM (i.e.: thehydrogenic and methanogenic steps).Methane production rates kept around 1000 mL per m2 of electrode and per dayregardless of the duration of the power interruptions and of the supplementation ofhydrogen. Interestingly, current density increased in the absence of hydrogen(averaged current density during hydrogen supplementation was 0.36 A·m-2 , increasingup to 0.58 A·m-2 without hydrogen). However current was less efficiently used in theproduction of methane with no hydrogen supplementation. Nevertheless, when theelectrical power was restored after the power interruption experiments, performanceparameters were similar to those observed before. These results indicate that EM isresilient to power fluctuations, which reinforces the opportunity of using EM as atechnology for renewable energy storage.
PB Elsevier
SN 0306-2619
LK http://hdl.handle.net/10612/16072
UL http://hdl.handle.net/10612/16072
NO Pelaz, G., González, R., Morán, A., & Escapa, A. (2023). Elucidating the impact of power interruptions on microbial electromethanogenesis. Applied Energy, 331. https://doi.org/10.1016/J.APENERGY.2022.120382
NO Preprint. Submitted version
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 21-may-2024