| Title |
Bioelectrochemical systems for energy storage: A scaled-up power-to-gas approach |
| ID_Doc |
14743 |
| Authors |
Ceballos-Escalera, A; Molognoni, D; Bosch-Jimenez, P; Shahparasti, M; Bouchakour, S; Luna, A; Guisasola, A; Borràs, E; Della Pirriera, M |
| Title |
Bioelectrochemical systems for energy storage: A scaled-up power-to-gas approach |
| Year |
2020 |
| Published |
|
| DOI |
10.1016/j.apenergy.2019.114138 |
| Abstract |
The development and implementation of energy storage solutions is essential for the sustainability of renewable energy penetration in the electrical system. In this regard, power-to-gas technologies are useful for seasonal, high-capacity energy storage. Bioelectrochemical systems for electromethanogenesis (EMG-BES) represent an additional power-to-gas technology to the existing chemical and biological methanation. EMG-BES process can be retrofitted in traditional anaerobic digesters, with advantages in terms of biologic process stability and high-quality biogas production. Nowadays, there are no reported studies of scaled-up EMG-BES plants for energy storage. The present work describes the setup and operation of a medium-scale EMG-BES prototype for power-togas, storing energy in the form of biomethane. The prototype was built by stacking 45 EMG-BES cells, accounting for a total volume of 32 L. It was continuously fed with 10 L day(-1) municipal wastewater, and it was long-term operated at different voltage and temperature ranges. A steady-state current density demand of 0.5 Am-2 was achieved at 32 degrees C while producing 4.4 L CH4 m(-2) d(-1) and removing 70% of the initial organic matter present in wastewater. Microbial competition between electro-active bacteria and acetoclastic methanogens was observed. Energy storage efficiency was estimated around 42-47%, analyzing surplus CH4 production obtained when applying voltage to the stack. A first order electric model was calculated, based on the results of a series of electrical characterization tests. The model may be used in the future to design the converter for EMG-BES plant connection to the electrical grid. The obtained results show that energy storage based on EMG-BES technology is possible, as well as its future potential, mixing renewable power overproduction, biomethane generation and wastewater treatment under the circular economy umbrella. |
| Author Keywords |
Biomethane; Electromethanogenesis; Microbial electrochemical technologies; Modelling; Power-to-gas; Renewable energy |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000515108700003 |
| WoS Category |
Energy & Fuels; Engineering, Chemical |
| Research Area |
Energy & Fuels; Engineering |
| PDF |
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