Fig. 4From: Impact of operational conditions on methane yield and microbial community composition during biological methanation in in situ and hybrid reactor systemsAverage methane yield of control reactor (CR), in situ upgrading reactor (UR) and hybrid upgrading reactor (HR). 2:1—H2 CO2 ratio of 2:1, 4:1—H2:CO2 ratio of 4:1Back to article page