Fig. 1

Performance of food waste/pig manure dry co-digestion systems. a Specific methane yield (SMY) and daily specific methane yield (DSMY) and b COD_VFA and COD_VFA+CH4. SMY and DSMY values are the mean of data from four replicate digesters except at the FW/PM ratio of 75:25, as one of the four replicate digestate inoculum systems and three of the four replicate sludge inoculum systems were inhibited, with almost no methane production. Only the results from the uninhibited digesters are shown here. COD_VFA and COD_{VFA + CH4} values are the mean of data from duplicate digesters where samples were taken