Fig. 2From: Conversion of H2 and CO2 to CH4 and acetate in fed-batch biogas reactors by mixed biogas community: a novel route for the power-to-gas conceptCumulative CH4 production from H2. α-cellulose (0.3 g) was added as substrate at the start of the experiment. H2 was injected into the reactor headspace daily, following flushing with N2. Green: no H2 added, red: 0.79 mmol H2 day−1, black 1.57 mmol H2 day−1, blue: 2.36 mmol H2 day−1 addedBack to article page