Table 5.
Main characteristics of Food Waste from a university canteen in each collection period.
| Units | FW1 | FW2 | FW3 | FW4 | FW5 | FW6 | FW7 | FW8 | FW9 | FW10 | FW11 | Range | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | Days | 1–20 | 21–40 | 41–57 | 58–72 | 73–96 | 97–114 | 115–132 | 133–145 | 146-155 | 156–180 | 181–198 | - |
| pH | - | 4.33 ± 0.61 | 6.54 ± 0.34 | 6.62 ± 0.75 | 6.46 ± 0.79 | 6.65 ± 0.23 | 6.67 ± 0.42 | 7.09 ± 0.40 | 6.11 ± 1.49 | 6.96 ± 1.15 | 5.73 ± 1.28 | 5.17 ± 0.85 | 4.33–7.09 |
| Total Solids (TS) | % w/w | 5.88 ± 1.63 | 7.31 ± 1.10 | 7.27 ± 0.35 | 6.57 ± 0.52 | 4.76 ± 0.38 | 4.45 ± 0.15 | 4.71 ± 0.42 | 7.03 ± 0.44 | 7.57 ± 0.96 | 6.39 ± 0.56 | 6.10 ± 1.23 | 4.45–7.57 |
| Volatile Solids (VS) | % w/w | 5.51 ± 1.68 | 6.12 ± 0.75 | 5.71 ± 0.24 | 5.46 ± 0.43 | 3.83 ± 0.24 | 3.78 ± 0.26 | 3.90 ± 0.28 | 6.40 ± 0.84 | 6.43 ± 1.03 | 5.79 ± 0.45 | 5.64 ± 1.18 | 3.78–6.40 |
| VFA | g/L | 1.08 ± 0.16 | 1.03 ± 0.08 | 1.21 ± 0.07 | 1.49 ± 0.18 | 0.98 ± 0.10 | 1.32 ± 0.13 | 0.93 ± 0.14 | 0.95 ± 0.28 | 0.75 ± 0.15 | 0.72 ± 0.19 | 0.83 ± 0.11 | 0.72–1.49 |
| Soluble COD (sCOD) | g/L | 40.6 ± 5.6 | 37.0 ± 2.9 | 38.7 ± 4.3 | 32.3 ± 14.7 | 31.1 ± 0.7 | 45.4 ± 1.6 | 51.0 ± 4.7 | 51.8 ± 4.7 | 14.9 ± 3.4 | 35.7 ± 21.8 | 31.9 ± 5.4 | 14.9–51.8 |
| NH4+-N | mg NH4+-N/L | 14.2 ± 3.9 | 34.1 ± 4.8 | 50.5 ± 1.3 | 26.7 ± 6.2 | 25.1 ± 7.1 | 13.0 ± 1.0 | 27.4 | 32.2 ± 12.0 | 26.6 ± 6.9 | 79.5 ± 23.8 | 107 ± 10 | 13–107 |