Fig. 1From: Effects of H2:CO2 ratio and H2 supply fluctuation on methane content and microbial community composition during in-situ biological biogas upgradingThe average (a) CH4 production rate and (b) gas compositions of control and H2-supplemented reactors. 1—start-up phase, 2—initial H2 and inhibition phase, 3—experimental phase and 4—stable phase. C: control reactor; H2: H2-supplemented reactor; H2_Glu: CH4 production rate from glucose digestion; H2_Conv: CH4 production rate from H2 conversion; Res H2: residual H2Back to article page