Table 1.
Percolation trials conditions (a) and composition of OFMSWs and digestates used and of percolates produced (b)
| Trial | T (°C) | Duration (day) | OFMSW (kg) | Digestate flow rate (L h−1 kg−1 OFMSWw.w.) | Percolate produced (L kg−1 OFMSWw.w.) | OA produceda (g kg−1 OFMSWw.w.) |
|---|---|---|---|---|---|---|
| a | ||||||
| Trial 1 | 30 | 21 | 44 | 0.02 | 8.03 | 60.5 |
| Trial 2 | 30 | 21 | 42.7 | 0.04 | 19.3 | 151 |
| Trial 3 | 40 (day 1–8) 30 (day 9–21) |
21 | 43.6 | 0.08 (1–8 day) 0.04 (9–21 day) |
25.57 | 139 |
| Trial | TS (%) | VS (%) | pH | OAa (mg L−1) | N-NH4 + (mg L−1) |
|---|---|---|---|---|---|
| b | |||||
| Trial 1, 2, 3 | |||||
| OFMSW (average) | 24.5 ± 3.9 | 86.8 ± 2.6 | 4.3 ± 0 | 11,663 ± 1.649 | 304 ± 239 |
| Trial 1, 2, 3 | |||||
| Digestate (average) | 2.2 ± 0.2 | 70.8 ± 2.7 | 8.32 ± 0.1 | 3448 ± 1.591 | 2065 ± 343 |
| Trial 1 | |||||
| Percolate 1 (P1) | 2.4 ± 0.49ab | 71.2 ± 2.2b | 6.91 ± 0.19a | 7540 ± 1,474b | 2231 ± 130b |
| Trial 2 | |||||
| Percolate 2 (P2) | 1.9 ± 1.1a | 66.5 ± 2.8a | 6.99 ± 0.61a | 7831 ± 1,775b | 2412 ± 472b |
| Trial 3 | |||||
| Percolate 3 (P3) | 2 ± 0a | 73 ± 2a | 6.99 ± 0.32a | 5437 ± 818a | 1784 ± 117a |
aOA expressed as acetic acid, determined according to the acid titration method [27]
bLimited to percolates, values in the same column followed by the same letter are not statistically different (ANOVA, Tukey test, p < 0.05)