Table 4.
Specific methanogenic activity of reactor sludge on different substrates.
| Substrate a | Mono-Digestion Sludge (Phase I) | Co-Digestion Sludge (Phase III) | ||
|---|---|---|---|---|
| Rm b (mL/d) | SMA c (mL/g VS/d) | Rm (mL/d) | SMA (mL/g VS/d) | |
| Glucose | 4.20 | 2.17 | 5.17 | 3.66 |
| HAc | 8.18 | 4.23 | 7.44 | 5.27 |
| HPr | 8.16 | 4.22 | 8.72 | 6.18 |
| HBu | 6.98 | 3.61 | 7.56 | 5.35 |
| HAc:HPr (2:1) | 6.72 | 3.48 | 8.09 | 5.73 |
| HAc:HPr:HBu (2:1:1) | 7.49 | 3.88 | 7.85 | 5.56 |
a HAc: acetate; HPr: propionate; Hbu: butyrate; molar mixing ratios are in parentheses. b Maximum methane production rate (Rm). c Specific methanogenic activity (SMA).