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Cited 7 time in webofscience Cited 9 time in scopus
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Influence of applied voltage and conductive material in DIET promotion for methane generation

Authors
Joicy, AnnaSeo, HwijinLee, Myoung-EunSong, Young-ChaeJeong, Yong-WookAhn, Yongtae
Issue Date
28-Feb-2022
Publisher
Pergamon Press Ltd.
Keywords
MEC-AD coupled system; Applied voltage; Conductive material (CM); Direct interspecies electron transfer; (DIET); Microbial activity; Methane yield
Citation
International Journal of Hydrogen Energy, v.47, no.18, pp 10228 - 10238
Pages
11
Indexed
SCIE
SCOPUS
Journal Title
International Journal of Hydrogen Energy
Volume
47
Number
18
Start Page
10228
End Page
10238
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/1595
DOI
10.1016/j.ijhydene.2022.01.0750360-3199
ISSN
0360-3199
1879-3487
Abstract
The utilization of biological-, electrode-and conductive material-mediated direct inter-species electron transfer (DIET) between exoelectrogenic bacteria and methanogenic archaea for enhancing methane productivity is widely reported in the literature. However, two cardinal questions are still controversial, i.e., which applied voltage value would be more recommended to enhance methane generation? and how the DIET over IIET has the upper hand in enhancing methane productivity? Herein, the influence of different applied voltages to promote biological-, conductive-and electrode-mediated DIET was investigated in MEC-AD reactors with conductive material. Polarized bioelectrodes induced electrode-mediated DIET (eDIET) and biological DIET (bDIET), in addition to cDIET (conductive material-mediated DIET), improved the methane yield to 315.40 mL/g CODr with an applied voltage of 0.9 V. Whereas further increase of applied voltage 1.2 V, lessened methane production efficiency due to high-voltage inhibition and adverse effect on DIET promotion. The anaerobic digestion coupled microbial electrolysis cells with optimal electric potential selectively promotes the DIET through polarized electrodes were confirmed through mi-crobial analysis. As the contribution of DIET increased to 80%, the methane yield increased, and the substrate residue decreased, resulting in a significant improvement in methane production. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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