Effects of an applied voltage on direct interspecies electron transfer via conductive materials for methane production
- Authors
- Lee, Jung-Yeol; Park, Jeong-Hoon; Park, Hee-Deung
- Issue Date
- 10월-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Anaerobic digestion; Direct interspecies electron transfer; Methanogenesis; Methanobacterium; Methanosaeta
- Citation
- WASTE MANAGEMENT, v.68, pp.165 - 172
- Indexed
- SCIE
SCOPUS
- Journal Title
- WASTE MANAGEMENT
- Volume
- 68
- Start Page
- 165
- End Page
- 172
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82125
- DOI
- 10.1016/j.wasman.2017.07.025
- ISSN
- 0956-053X
- Abstract
- Direct interspecies electron transfer (DIET) between exoelectrogenic bacteria and methanogenic archaea via conductive materials is reported as an efficient method to produce methane in anaerobic organic waste digestion. A voltage can be applied to the conductive materials to accelerate the DIET between two groups of microorganisms to produce methane. To evaluate this hypothesis, two sets of anaerobic serum bottles with and without applied voltage were used with a pair of graphite rods as conductive materials to facilitate DIET. Initially, the methane production rate was similar between the two sets of serum bottles, and later the serum bottles with an applied voltage of 0.39 V showed a 168% higher methane production rate than serum bottles without an applied voltage. In cyclic voltammograms, the characteristic redox peaks for hydrogen and acetate oxidation were identified in the serum bottles with an applied voltage. In the microbial community analyses, hydrogenotrophic methanogens (e.g. Methanobacterium) were observed to be abundant in serum bottles with an applied voltage, while methanogens utilizing carbon dioxide (e.g., Methanosaeta and Methanosarcina) were dominant in serum bottles without an applied voltage. Taken together, the applied voltage on conductive materials might not be effective to promote DIET in methane production. Instead, it appeared to generate a condition for hydrogenotrophic methanogenesis. (C) 2017 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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