Exogenous addition of H for an in situ biogas upgrading through biological reduction of carbon dioxide into methane.

Biological reduction of CO into CH by exogenous addition of H is a promising technology for upgrading biogas into higher CH content. The aim of this work was to study the feasibility of exogenous H addition for an in situ biogas upgrading through biological conversion of the biogas CO into CH Moreover, this study employed systematic study with isotope analysis for providing comprehensive evidence on the underlying pathways of CH production and upstream processes. Batch reactors were inoculated with digestate originating from a full-scale biogas plant and fed once with maize leaf substrate.

Identification of syntrophic acetate-oxidizing bacteria in anaerobic digesters by combined protein-based stable isotope probing and metagenomics.

Inhibition of anaerobic digestion through accumulation of volatile fatty acids occasionally occurs as the result of unbalanced growth between acidogenic bacteria and methanogens. A fast recovery is a prerequisite for establishing an economical production of biogas. However, very little is known about the microorganisms facilitating this recovery.