Fig. 2From: From grass to gas: microbiome dynamics of grass biomass acidification under mesophilic and thermophilic temperaturesChemical parameters during acidification and methane production: total amount of TVFA was monitored daily and samples obtained at the end of each acidification cycle were subjected to the determination of VFA spectra (a). Produced methane is shown as volume of methane per volume of sludge (b) and as volume of methane per mg of input COD (c)Back to article page