Table 7. Volatile fatty acids profile of two-stage anaerobic digestion of high moisture municipal solid waste (MSW) from Nakhon Si Thammarat landfill site, Thailand.
| Hydrogen production stage | ||||||||
|---|---|---|---|---|---|---|---|---|
| Initial VS loading (g-VS L−1) | IFA addition (%w/v) | Acetic acid (mg L−1) | Propionic acid (mg L−1) | Isobutyric acid (mg L−1) | Butyric acid (mg L−1) | Isovaleric acid (mg L−1) | Valeric acid (mg L−1) | TVFAs (mg L−1) |
| 9 | 0.5 | 678.1 | 156.2 | 24.4 | 721.5 | 26.9 | 0.0 | 1,607 |
| 17 | 0.5 | 454.0 | 153.2 | 0.0 | 559.4 | 18.4 | 0.0 | 1,185 |
| 26 | 0.5 | 766.8 | 102.0 | 25.0 | 786.6 | 25.6 | 0.0 | 1,706 |
| 35 | 0.5 | 732.1 | 239.0 | 0.0 | 776.6 | 23.3 | 0.0 | 1,771 |
| 43 | 0.5 | 805.8 | 336.4 | 29.3 | 866.1 | 28.4 | 0.0 | 2,066 |
| 9 | 1 | 508.7 | 161.1 | 20.0 | 635.7 | 24.5 | 0.0 | 1,350 |
| 17 | 1 | 493.6 | 157.6 | 0.0 | 522.2 | 21.6 | 0.0 | 1,195 |
| 26 | 1 | 503.7 | 242.0 | 0.0 | 657.4 | 19.9 | 0.0 | 1,423 |
| 35 | 1 | 689.1 | 377.6 | 37.1 | 863.3 | 25.8 | 27.2 | 2,020 |
| 43 | 1 | 682.3 | 267.8 | 19.7 | 685.9 | 24.3 | 0.0 | 1,680 |
| 9 | 0 | 1351.5 | 530.5 | 39.1 | 1358.7 | 48.1 | 0.0 | 3,328 |