NDLI: Hydrogen production, methanogen inhibition and microbial community structures in psychrophilic single-chamber microbial electrolysis cells

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Back cover

Energy & Environmental Science Vol - 4 Issue - 3

Energy & Environmental Science Vol - 4 Issue - 2

Energy & Environmental Science Vol -3

Energy & Environmental Science Vol -2

Energy & Environmental Science Vol -1

Hydrogen production, methanogen inhibition and microbial community structures in psychrophilic single-chamber microbial electrolysis cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Huan Lu, Lu Zhao, Xin Ren, Nanqi Wu, Di Xing, Defeng
Copyright Year	2011
Abstract	Hydrogen production by fermentative bacteria and photosynthetic organisms is depressed under psychrophilic conditions. Here we describe single-chamber microbial electrolysis cells (MECs), which were enriched successfully at 4 °C or 9 °C and operated at these temperatures for the production of hydrogen. The rates of hydrogen production varied from 0.23 ± 0.03 to 0.53 ± 0.04 m3 H2 m−3d−1, and the hydrogen yield was in the range 2.66 ± 0.22 − 2.94 ± 0.02 mol H2 mol−1acetate. The energy efficiency based on electrical input ranged from 154 ± 9 to 200 ± 18% using an applied voltage of 0.6 V or 0.8 V; CH4 was not detected in any of the reactors. The separate MECs were first operated at 25 °C and methanogenesis was found to occur in them, however no CH4 was produced if the cells were operated at 4 °C or 9 °C. 16S rRNA gene clone libraries constructed for Archaea proved that the growth of hydrogenotrophic methanogens such as Methanobrevibacter arboriphilus cultured in MECs at 25 °C was effectively inhibited under psychrophilic conditions, and the growth of these organisms was initially suppressed in these MECs maintained at low temperatures. Bacterial 16S rRNA gene clone library analyses showed that temperature significantly influenced the community structure of the anode biofilms in MECs, and Geobacter psychrophilus was found to be the dominant psychrotolerant population in MECs maintained at 4 °C and 9 °C. Our study also demonstrated that frequent inoculation using pre-acclimatized suspensions of microbial fuel cells (MFCs) greatly facilitated the rapid formation of psychrophilic biofilms in MECs at low temperature.
Starting Page	1329
Ending Page	1336
Page Count	8
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	4
Issue Number	4
Journal	Energy & Environmental Science
DOI	10.1039/c0ee00588f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Archaea Hydrogen production Bacteria Photosynthesis Psychrophile Electrolysis Hydrogen Energy conversion efficiency Methanogenesis 16S ribosomal RNA Gene Hydrogenotroph Library (biology) Anode Geobacter Inoculation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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Hydrogen production, methanogen inhibition and microbial community structures in psychrophilic single-chamber microbial electrolysis cells

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