Archaea / 2013 / Article / Fig 5

Research Article

A Single-Culture Bioprocess of Methanothermobacter thermautotrophicus to Upgrade Digester Biogas by CO2-to-CH4 Conversion with H2

Figure 5

Bioreactor performance for Experiment 4. Volumetric methane production rates (a), hydrogen conversion efficiencies (b), and biomass concentrations (c) during one bioreactor run. The bioreactor was moved from the laboratory to the industrial site on hour 117 of the operating period (straight line) while untreated biogas was introduced instead of synthetic CO2 on hour 164 of the operating period (dotted line).