NDLI: Methanogenesis in membraneless microbial electrolysis cells

Content Provider	Springer Nature Link
Author	Clauwaert, Peter Verstraete, Willy
Copyright Year	2008
Abstract	Operation of microbial electrolysis cells (MECs) without an ion exchange membrane could help to lower the construction costs while lowering the ohmic cell resistance and improving MEC conversion rates by minimizing the pH gradient between anode and cathode. In this research, we demonstrate that membraneless MECs with plain graphite can be operated for methane production without pH adjustment and that the ohmic cell resistance could be lowered with approximately 50% by removing the cation exchange membrane. As a result, the current production increased from 66 ± 2 to 156 ± 1 A m−3 MEC by removing the membrane with an applied voltage of −0.8 V. Methane was the main energetic product despite continuous operation under carbonate-limited and slightly acidified conditions (pH 6.1–6.2). Our results suggest that continuous production of hydrogen in membraneless MECs will be challenging since methane production might not be avoided easily. The electrical energy invested was not always completely recovered under the form of an energy-rich biogas; however, our results indicate that membraneless MECs might be a viable polishing step for the treatment of the effluent of anaerobic digesters as methane was produced under low organic loading conditions and at room temperature.
Starting Page	829
Ending Page	836
Page Count	8
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	82
Issue Number	5
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-12-03
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Phosphate buffer Biocatalyzed electrolysis Overpotentials Biocatalysts Ohmic resistance Microbial fuel cell Microbial Genetics and Genomics Microbiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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