Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 40, 2015
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Article information


Submitted
26 Feb 2015
Accepted
25 Mar 2015
First published
25 Mar 2015

RSC Adv., 2015,5, 31329-31340
Article type
Paper
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

Social activity

Search articles by author

Spotlight

Advertisements