Table 2.
Comparison of methane yields from prehydrolyzed biowastes by direct and indirect biomethanation
| Mixed bacterial culture | Direct biomethanationa | Indirect biomethanation | ||||
|---|---|---|---|---|---|---|
| 3 % TSb | 5 % TS | 7 % TS | 3 % TS | 5 % TS | 7 % TS | |
| Vegetable waste | ||||||
| Controlc | 20.0 | 26.5 | 36.4 | 8.0 | 13.4 | 8.6 |
| BC6 | 17.5 | 29.3 | 25.0 | 7.3 | 15.2 | 11.4 |
| BC7 | 61.7 | 31.0 | 15.7 | 28.3 | 16.6 | 10.0 |
| BC8 | 26.7 | 42.2 | 31.4 | 12.7 | 13.5 | 10.7 |
| BC10 | 17.5 | 36.4 | 38.6 | 6.0 | 14.7 | 11.4 |
| Food waste | ||||||
| Control | 55.0 | 26.0 | 20.3 | 26.3 | 16.7 | 10.7 |
| BC1 | 50.0 | 37.4 | 32.1 | 30.0 | 19.4 | 12.1 |
| BC6 | 63.3 | 54.5 | 24.3 | 31.7 | 17.5 | 13.6 |
| BC8 | 46.7 | 45.2 | 42.1 | 21.4 | 19.2 | 12.8 |
| BC9 | 48.3 | 52.3 | 37.9 | 31.5 | 18.5 | 12.1 |
aCH4 production in l/kg Total solids fed
b Total solids
c No mixed bacterial culture added