A directional electrode separator improves anodic biofilm current density in a well-mixed single-chamber bioelectrochemical system.

Autor: Anoy MMI; The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA., Hill EA; Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA., Garcia MR; Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA., Kim WJ; The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA., Beliaev AS; Environmental Molecular Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA; Centre for Agriculture and the Bioeconomy, Faculty of Science, Queensland University of Technology, Brisbane, QLD 4000, Australia., Beyenal H; The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA. Electronic address: beyenal@wsu.edu.
Jazyk: angličtina
Zdroj: Enzyme and microbial technology [Enzyme Microb Technol] 2024 Oct; Vol. 180, pp. 110502. Date of Electronic Publication: 2024 Aug 22.
DOI: 10.1016/j.enzmictec.2024.110502
Abstrakt: In this study, a directional electrode separator (DES) was designed and incorporated into a single-chamber bioelectrochemical system (BES) to reduce migration and reoxidation of hydrogen. This issue arises when H 2 , generated at the cathode, travels to the anode where anodic biofilms use H 2 . To test the feasibility of our design, a 3D-printed BES reactor equipped with a DES was inoculated with anaerobic digestor granules and operated under fed-batch conditions using fermented corn stover effluent. The DES equipped reactor achieved significantly higher current densities (∼53 A/m²) compared to a conventional single-chamber BES without a separator (∼16 A/m²), showing a 3.3 times improvement. Control abiotic electrochemical experiments revealed that the DES exhibited significantly higher proton conductivity (456±127 µS/mm) compared to a proton exchange membrane (67±21 µS/mm) with a statistical significance of P=0.03. The DES also effectively reduced H 2 migration to the anode by 21-fold relative to the control. Overall, incorporating a DES in a single-chamber BES enhanced anodic current density by reducing H 2 migration to the anode.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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