Fig. 7From: Biochar-promoted methane production and mitigation of acidification during thermophilic anaerobic co-digestion of food waste with crude glycerol: comparison with re-inoculationXRD patterns (a) of biochars before and after AD. Peaks of quartz (Qtz), calcite (Cal), sylvite (Syl) in XRD spectra are designated, and FTIR-ATR spectra (b) of biochars before and after AD. Major peaks of different functional groups are indicatedBack to article page