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Hydrogen-based syntrophy in an electrically conductive biofilm anode

Authors
Dhar, Bipro RanjanPark, Jeong-HoonPark, Hee-DeungLee, Hyung-Sool
Issue Date
1-3월-2019
Publisher
ELSEVIER SCIENCE SA
Keywords
Butyrate; Hydrogen; Geobacter; Biofilm conductivity; Acetogenesis; Direct interspecies electron transfer
Citation
CHEMICAL ENGINEERING JOURNAL, v.359, pp.208 - 216
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL ENGINEERING JOURNAL
Volume
359
Start Page
208
End Page
216
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/67045
DOI
10.1016/j.cej.2018.11.138
ISSN
1385-8947
Abstract
We experimentally and theoretically investigated implications of H-2 and a rate-limiting step in a mixed-culture biofilm anode fed with n-butyrate, one of the poorest substrates to exoelectrogens. Acetate and i-butyrate were formed as intermediates during anaerobic degradation of n-butyrate, which suggested oxidative acetogenesis of n-butyrate in syntrophy with H-2 scavengers in the biofilm anode. Methane was not detected in an anode chamber, and no current was generated in the biofilm anode using H-2 as the electron donor. These results indicated that acetogens would be a main H-2 consumer in the biofilm. Pyrosequencing data showed dominance of Geobacter in the biofilm anode (83.6% of total sequences), along with Sphaerochaeta and Treponema, which supports the syntrophy between exoelectrogens and acetogens. Electrical conductivity of the butyrate-fed biofilm anode was as high as 0.67 mS/cm, demonstrating that EET does not limit current density in the biofilm. In-situ monitoring of dissolved H-2 concentration proved H-2 production (up to 12.4 mu M) and consumption during current generation in the biofilm, which supports significance of H-2-based syntrophy in the electrically conductive biofilm using n-butyrate as the primary electron donor.
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Park, Hee Deung
공과대학 (건축사회환경공학부)
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