| Mesophilic Low load, M1 | Mesophilic High load, M2 | Thermophilic Low load, M3 | Thermophilic High load, M4 |
---|---|---|---|---|
Process parameters | Â | Â | Â | Â |
OLR*), kgVS m-3d-1 | 3 | 8 | 3 | 8-10 |
HRT **), days | 22 | 10 | 23 | 9 |
Temperature, °C | 36-37 | 36-37 | 54-55 | 54-55 |
pH | 7.4-7.5 | 7.4-7.5 | 8.0-8.1 | 8.0-8.1 |
NH4-N, g liter-1 | 1.1-1.2 | 1.2-1.3 | 1.6-1.7 | 1.0-1.1 |
Alkalinity, mgCaCO3 liter-1 | 5400 - 6000 | 6300 - 6700 | 6200 - 6700 | 4900 - 5300 |
VFA***), mg liter-1 | 110 - 160 | 200 - 340 | 480 - 590 | 350 - 600 |
TS, % | 3.1 – 3.2 | 4 – 4.5 | 3.2 – 3.3 | 3.7 – 4.2 |
VS, % | 1.6 – 1.8 | 2.4 – 2.9 | 2.0 – 2.1 | 2.3 – 2.7 |
TS-reduction ****), % | 61 - 62 | 60 - 62 | 60 - 62 | 55 – 60 |
VS-reduction, % | 72 - 74 | 66 - 69 | 70 - 71 | 64 - 70 |
Feed characteristics | Â | Â | Â | Â |
TS, % | Â | Â | Â | Â |
Biowaste (BW) | 14.9 – 24.6 | 29 – 32.2 | 26.7 | 29.9 – 21.1 |
Sewage sludge (SS) | 4.1 – 4.2 | 3.1 – 4.8 | 3.3 – 4.1 | 4.5 – 6.0 |
BW and SS mixture | 8.6 – 10.3 | 11.8 – 13.0 | 10.7 – 10.9 | 9.5 – 10.6 |
VS, % | Â | Â | Â | Â |
Biowaste (BW) | 14.3 – 21.6 | 21.8 – 26.2 | 24.6 | 18 – 19.1 |
Sewage sludge (SS) | 2.7 – 3.6 | 1.8 – 3.2 | 1.9 – 2.6 | 2.8 – 3.7 |
BW and SS mixture | 6.2 – 8.4 | 7.9 – 8.8 | 8.7 – 9.2 | 7.4 – 8.0 |