Fig. 4From: Biochar-promoted methane production and mitigation of acidification during thermophilic anaerobic co-digestion of food waste with crude glycerol: comparison with re-inoculationVariations in VFAs concentrations (a) and compositions in different reactors: (b) Control reactor; (c) RI reactor, and (d) BA reactor. Shaded areas indicate error barsBack to article page