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Enhanced electron uptake and methane production by corrosive methanogens during electromethanogenesis
Mayer, F.; Sabel-Becker, B.; Holtmann, D. (2022). Enhanced electron uptake and methane production by corrosive methanogens during electromethanogenesis. Microorganisms 10(11): 2237. https://dx.doi.org/10.3390/microorganisms10112237
In: Microorganisms. MDPI: Basel. e-ISSN 2076-2607, more
Peer reviewed article  

Available in  Authors 

Author keywords
    electromethanogenesis; microbial electrosynthesis; corrosive methanogens; electron uptake mechanism; genome analysis; biofuel

Authors  Top 
  • Mayer, F., more
  • Sabel-Becker, B.
  • Holtmann, D.

Abstract
    Electromethanogenesis is an interesting next-generation technology to produce methane from CO2 and electricity by using methanogens. Iron-corroding methanogens might be of special interest for that application due to their natural ability for electron uptake. Methanococcus maripaludis Mic1c10 and KA1 were tested in bioelectrochemical systems. Strain Mic1c10 showed a 120% higher current density and an 84% higher methane production rate (16.2 mmol m−2 d−2) than the non-corrosive strain Methanococcus maripaludis S2, which was identified earlier as the best methane producer under the same experimental conditions. Interestingly, strain KA1 also showed a 265% higher current density than strain S2. Deposits at the cathodes were detected and analyzed, which were not described earlier. A comparative genome analysis between the corrosive methanogen and the S2 strain enables new insights into proteins that are involved in enhanced electron transfer.

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