Table 1. Characteristics of the substrates and inoculums.
| Parameters | FWa 1 (days 1–30) | FW 2 (days 31–60) | FW 3 (days 61–90) | FW 4 (days 91–120) | Inoculums |
| TSb (%, w/w) | 26.5±0.6 | 27.8±1.1 | 27.3±1.2 | 26.8±1.2 | 4.1±0.1 |
| VSc/TS (%) | 94.7±3.9 | 92.2±3.7 | 93.4±4.6 | 93.9±4.2 | 52.3±2.4 |
| pH | 4.72±0.21 | 4.64±0.11 | 4.79±0.24 | 4.87±0.23 | 7.9±0.3 |
| C/N (w/w) | 13.4±0.6 | 14.2±0.7 | 13.9±0.4 | 13.6±0.6 | - |
| TANd (mg/L) | 538±24 | 546±19 | 534±25 | 543±19 | 299±13 |
–Not determined.
a
FW: food waste.
b
TS: total solids.
c
VS: volatile solids.
d
TAN: total ammonia nitrogen.