Archaea / 2021 / Article / Fig 2

Research Article

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

Figure 2

Mean values of parameters measured during each of the eight experimental periods (in brackets the H2/CO2 ratio): (a) box plots of methane rate (circles indicate outliers); (b) biogas composition; (c) TVFA composition and alcohols; (d) box plots of alkalinity concentrations (circles indicate outliers).