Table 8 Analysis data of samples of the biogas plant BP C
From: Foam formation in full-scale biogas plants processing biogenic waste
| Digester D1 | Digester D2 | Digester D3 | |||
|---|---|---|---|---|---|
| Index | Digestate | Digestate | Digestate | Foam | |
| TS [%] | O | 3.55 | 3.44 | 3.20 | 3.43 |
| VS [% TS] | O | n. d. | 69.3 | 69.8 | 70.7 |
| pH [−] | CE | 7.33 | 7.24 | 7.36 | 7.64 |
| VFA/TIC [−] | CA | 0.05 | 0.06 | 0.08 | 0.06 |
| NH4-N [g/L] | F | 0.86 | 0.94 | 0.99 | 1.20 |
| Total organic carbon [g/L] | CE | 1.20 | 1.11 | 2.13 | 1.22 |
| Total nitrogen [g/L] | CE | 1.54 | 1.46 | 2.01 | 1.81 |
| Acetate [mg/L] | F | 2.2 | 21 | 30 | 59 |
| Propionate [mg/L] | F | <1 | 5.5 | 3.6 | 10 |
| Butyrate [mg/L] | F | <1 | <1 | <1 | <1 |
| Palmitic acid [%] | E | 36.8 | 39.2 | 28.4 | 27.7 |
| Stearic acid [%] | E | 28.7 | 29.9 | 19.8 | 19.3 |
| Oleic acid [%] | E | 21.7 | 18.1 | 43.5 | 43.2 |
| Linoleic acid [%] | E | 10.9 | 9.6 | 5.8 | 6.8 |
| Linolenic acid [%] | E | 1.9 | 3.2 | 2.5 | 2.9 |
| Surface tension [mN/m] | CE | 72 | 72 | 71 | 71 |