Bioreactor | Initial (feed stock) | Final (digestate) | Cumulative biogas yield (mL g−1 VS) | Methane yield (mol %) | ||||
---|---|---|---|---|---|---|---|---|
TS (%) | VS (%) | pH | TS (%) | VS (%) | pH | |||
A | 25.4 ± 0.15d | 8.1 ± 0.10d | 7.3 ± 0.10b | 9.6 ± 0.10a | 3.8 ± 0.21a | 5.6 ± 0.06b | 310 | 89.9 |
B | 21.6 ± 1.00b | 7.3 ± 0.10b | 6.9 ± 0.10a | 13.5 ± 0.10c | 4.6 ± 0.10b | 5.3 ± 0.10a | 194 | 75.7 |
C | 23.4 ± 0.10c | 7.9 ± 0.10c | 7.4 ± 0.10b | 11.2 ± 0.10b | 3.8 ± 0.10a | 5.4 ± 0.10a | 241 | 81.1 |
D (control) | 19.0 ± 1.00a | 6.9 ± 0.10a | 6.8 ± 0.10a | 17.1 ± 0.10b | 6.6 ± 0.10c | 5.2 ± 0.10a | 41 | 59.3 |
BSG alone | 19.0 ± 0.08 | 14.2 ± 0.03 | 7.1 ± 0.01 | 15.3 ± 0.11 | 9.5 ± 0.17 | 6.1 ± 1.00 | 35 | 44.4 |
POME alone | 15.9 ± 0.15 | 4.9 ± 0.01 | 5.6 ± 0.10 | 13.9 ± 0.06 | 4.0 ± 0.09 | 5.0 ± 0.12 | 27 | 37.5 |