Table 2.
Methane potential and time for degradation of straw and cellulose obtained in biochemical methane potential tests using inoculum from different biogas plants co-digesting different substrates (CD) or sludge from wastewater treatment plants (WWTP)
| Inoculum | Cellulose | Straw | ||||||
|---|---|---|---|---|---|---|---|---|
| Days to reach % of the final potential | Final potential | Days to reach % of the final potential | Final potential | |||||
| 100 % | 80 % | 50 % | 100 % | 80 % | 50 % | |||
| CD01 | 41 | 24 | 18 | 319 ± 24 | 110 | 56 | 28 | 258 ± 47 |
| CD02 | 110 | 71 | 47 | 307 ± 54 | 75 | 62 | 45 | 233 ± 38 |
| CD03 | 12 | 6 | 5 | 347 ± 15 | 60 | 23 | 8 | 316 ± 37 |
| CD04 | 20 | 10 | 8 | 348 ± 24 | 26 | 10 | 8 | 274 ± 17 |
| WWTP01 | 57 | 15 | 7 | 350 ± 7 | 110 | 44 | 19 | 290 ± 9 |
| WWTP02 | 36 | 13 | 7 | 314 ± 34 | 57 | 24 | 14 | 240 ± 38 |
| WWTP03 | 27 | 11 | 6 | 322 ± 7 | 75 | 25 | 13 | 310 ± 76 |
| WWTP04 | 29 | 15 | 8 | 325 ± 8 | 60 | 20 | 11 | 277 ± 11 |
| WWTP05 | 45 | 9 | 6 | 376 ± 8 | 59 | 30 | 10 | 281 ± 32 |
| WWTP06 | 49 | 13 | 8 | 324 ± 13 | 135 | 39 | 18 | 296 ± 8 |