The maximum average PC achieved in this study was 7.0 ± 0.17 Nm 3 /m 3 d with the inert gas present in the feed gas and an average outlet gas quality of C N 2 +CH 4 of 91% ± 1.7% was achieved. During the biomethanation trail, the maximum average PC was 9.44 Nm 3 /m 3 d, however, this was achieved at GRT of 16 min and without complete conversion of H 2 and CO 2 . These values of PC are lower as compared to the maximum reported in the literature for BTF, for example, PC of 15.4 Nm 3 /m 3 d was reported by . The relatively lower PC achieved in this study could be due to the packing material, as in the earlier study a PC of 8.54 ± 0.47 Nm 3 /m 3 d was achieved , that used a similar BTF design and PCM as nutrient media but had polyurethane foam as the packing material.