Performance of different methanogenic species for the microbial electrosynthesis of methane from carbon dioxide.

Abstract:

:Microbial electrosynthesis (MES) is a promising technology to convert CO2 and electricity into the biofuel methane using methanogens. Until now, most investigations on electro-methanogenesis are "proof-of-principle" studies. In this paper, different strains were quantitatively compared in regard to final methane concentration, yields based on CO2-conversion, productivities as well as Coulombic efficiencies in order to identify suitable organisms for MES. Methanococcus vannielii, Methanococcus maripaludis, Methanolacinia petrolearia, Methanobacterium congolense, and Methanoculleus submarinus were able to produce methane via MES at -700 mV vs. standard hydrogen electrode (SHE). Beside methane also biological H2 production was detected during MES, which might be due to the involvement of hydrogenases. A direct electron transfer pathway is most likely. Obviously, M. maripaludis is the most resource efficient methane producer in microbial electrosynthesis regarding the methane productivity (8.81 ± 0.51 mmol m-2 d-1) and the Coulombic efficiency (58.9 ± 0.8%).

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Mayer F,Enzmann F,Lopez AM,Holtmann D

doi

10.1016/j.biortech.2019.121706

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

121706

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(19)30936-8

journal_volume

289

pub_type

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