Table 2 Sludge characteristics (undiluted sludge) (mean ± SD) and some basic parameters of the digestions plants the inocula were derived from [50,51,52,53,54]
Parameter | Mesophilic inoculum | Thermophilic inoculum |
|---|---|---|
Reactor capacity (m3) | 1350 | 900 |
Sampling point | Effluent | Reactor outlet |
Operation temperature (°C) | 39 (0.2) | 53 (0.3) |
pH | 7.36 (0.21) | 7.9 (0.44) |
Total solids (TS) (g 100 g−1 FW) | 2.2 (0.04) | 26.2 (2.0) |
Volatile solids (VS) (g 100 g−1 TS) | 61.0 (1.89) |  |
NH4-N (mg N kg−1) | 1385 (128) | 3200 (460) |
Acetate (g kg−1) | < 0.1 | 1.9 (1.52) |
Propionate (g kg−1) | < 0.1 | 1.3 (1.15) |
Methanogenic community dominated by | Methanosaeta sp. | Methanothermobacter sp., Methanoculleus sp. |