Table 1 H2-feeding experiments and process parameters: maximum and minimum pH value, CH4 production rate (MPR), daily maximum CH4 volume fraction in the outlet gas\({(y}_{{CH}_{4},out, max})\), daily relative conversion yield of H2 to CH4 (\({Yrel}_{{CH}_{4}:{H}_{2}}\)) and daily absolute conversion yield of CO2 to CH4 (\({Yabs}_{{CH}_{4} :{CO}_{2}}\)). Data with errors represent the standard deviation around the mean within each H2-feeding regime
From: Adaptation of a microbial community to demand-oriented biological methanation
H2-feeding regime (BM-On/Off) | pH min | pH max | \(MPR\) \(({L}_{{CH}_{4}}/{L}_{MR}/d)\) | \({y}_{{CH}_{4} ,out, max}\)(%) | \({Yrel}_{{CH}_{4}: {H}_{2}}\)(\({L}_{{CH}_{4}}/{L}_{{H}_{2}}\)) | \({Yabs}_{{CH}_{4} :{CO}_{2}}{(L}_{{CH}_{4}}/{L}_{{CO}_{2}}\)) |
|---|---|---|---|---|---|---|
BM-24/0 | 8.3 | 8.5 | 0.71 ± 0.07 | 84.78 ± 3.34 | 0.80 ± 0.08 | 0.73 ± 0.07 |
BM-12/12 | 7.9 | 8.9 | 0.59 ± 0.07 | 79.89 ± 1.76 | 0.67 ± 0.08 | 0.61 ± 0.07 |
BM-18/6 | 9.2 | 9.7 | 0.80 ± 0.07 | 88.33 ± 2.71 | 0.91 ± 0.08 | 0.82 ± 0.07 |
BM-6/18 | 8.8 | 9.2 | 0.43 ± 0.05 | 70.74 ± 3.94 | 0.49 ± 0.05 | 0.44 ± 0.05 |
BM-12/12–20%a | 8.8 | 10.2b | 0.66 ± 0.10 | 68.95 ± 8.01 | 0.75 ± 0.11 | 0.67 ± 0.10 |