Performance Analysis and Microbial Community Evolution of In Situ Biological Biogas Upgrading with Increasing H₂/CO₂ Ratio

Figure 4

(a) Relative abundance of the bacterial phyla of two parallel reactors at several sampling points. (b) Heat maps of relative abundance (>1%) of the most abundant bacterial ASVs of R1 and R2. The scale limit starts from 0 (abundance equal to 1% because of the selection) to 8%. Increasing red colour indicates a higher value of relative species abundance, and blue colour indicates a lower relative abundance.

(a)

(b)