Fig. 6From: Biochar-promoted methane production and mitigation of acidification during thermophilic anaerobic co-digestion of food waste with crude glycerol: comparison with re-inoculationStructure of biochar from wood chips of conifer. All photographs were taken by SEM: a Biochar granules (85 ×); b Pore structure at cutoff (350 ×); c Fence-like structure inside (1200 ×); d Structure within the internal voids of biochar after 100 days of AD (1600 ×)Back to article page