“…Methane potentials obtained both for DIG and SS-DIG are in accordance with previous literature data, as reported in Table 3. Results were also found in accordance with those of Ruile et al [10] who investigated the residual methane potential of whole digestate from 21 fullscale digesters and they reported methane yields varying from 24 to 126 NmL CH 4 /g VS. Conversely, Menardo et al [11] reported lower methane potential for whole digestate, ranging from 3 to 34 NmL CH 4 /g VS, compared to those noticed in this study. However, as stated by the authors, the low methane yields could be partially explained by the inhibitory effect on the digestion process from the high ammonia concentrations (higher than 2.5 g/L), recognized as inhibitory for the methanogenic archae [34,35].…”