Table 2.
Production of biogas and concentrations of methane and selected trace gases from the pilot AD reactor at organic loads of 3 (M1, M3) and 5–8 (M2, M4) kgVS m-3
| Parameter | Mesophilic Low load, M1 | Mesophilic High load, M2 | Thermophilic Low load, M3 | Thermophilic High load, M4 |
|---|---|---|---|---|
| Biogas*) Ndm3/kgVSfed |
646 +/− 47 |
586 +/− 30 |
632 +/− 76 |
496 +/− 71 |
| Methane (%, min-max) |
52.3 – 66.0 |
46.0 – 70,9 |
51.7 – 68.0 |
nd |
|
Trace gases |
|
|
|
|
| Ammonia, NH3 (ppm) |
< 3 |
< 3 |
83 |
38 |
| H2S (ppm) |
< 0.1 |
< 0.1 |
nd |
< 10 |
| DMS (ppm) |
< 0.2 |
< 0.2 |
nd |
< 5 |
| EtOH (ppm) | 10 | 125 | 2380 | 2230 |
*) average biogas production and standard deviations based on a daily and weekly production amount (liters) and feed (kgVS) at each sampling OLR period. The values are normalized for 273 K.