Issue 40, 2015

Coupling electric energy and biogas production in anaerobic digesters – impacts on the microbiome

Abstract

The combination of anaerobic digestion (AD) and microbial electrochemical technologies provides the opportunity to efficiently produce methane and electrical energy from complex biomass. Enhanced methane production and system stability have been reported but the causes (electrolysis or microbial–electrochemical interactions) are less understood. Using the model substrate corn silage it is demonstrated that, for conditions allowing microbiome growth and adaptation, the methane yield of combined reactors remains constant (216 (±29) mL godm−1) while a second product, electrons (q = 14.4 (±0.8) kC, jmax = 1.34 mA cm−2 geometric current density), is also generated. The combined strategy allowed up to a 27% increase in total yield while the reactor community and its dynamics over time were not affected. A typical AD composition of Firmicutes, Bacteroidetes, Proteobacteria, and Synergistetes (bacteria) as well as Methanosarcina, Methanoculleus and Methanobacterium (archaea) was found in the bulk liquid. Specific enrichments of Geobacter (anode) and Methanobacterium (cathode) were of functional relevance.

Graphical abstract: Coupling electric energy and biogas production in anaerobic digesters – impacts on the microbiome

Supplementary files

Article information

Article type
Paper
Submitted
26 Feb 2015
Accepted
25 Mar 2015
First published
25 Mar 2015

RSC Adv., 2015,5, 31329-31340

Author version available

Coupling electric energy and biogas production in anaerobic digesters – impacts on the microbiome

C. Koch, A. Kuchenbuch, J. Kretzschmar, H. Wedwitschka, J. Liebetrau, S. Müller and F. Harnisch, RSC Adv., 2015, 5, 31329 DOI: 10.1039/C5RA03496E

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