Table 9 Analysis data of samples from the biogas plants BP D and BP E
From: Foam formation in full-scale biogas plants processing biogenic waste
Biogas plant BP D | Biogas plant BP E | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Digestate | Foam | Digestate | Foam | Substrate | Digestate | Recirculate | |||
Index | First sampling (17th July 2012) | Second sampling (27th August 2012) | Index | 8th September 2011 | |||||
TS [%] | O | 2.17 | 1.60 | 1.98 | 1.93 | O | 14.3 | 10.7 | 8.08 |
VS [% TS] | O | 72.2 | 69.4 | 63.8 | 74.4 | O | 69.5 | 77.0 | 76.3 |
pH [−] | S | 7.93 | 8.22 | 7.96 | 8.67 | CE | 8.23 | 7.18 | 8.10 |
VFA/TIC [−] | CA | 0.24 | 0.19 | 0.16 | 0.20 | CA | 1.39 | 0.16 | 0.20 |
NH4-N [g/L] | F | 0.55 | 0.33 | 0.64 | 0.67 | F | 5.05 | 4.01 | 4.07 |
Total organic carbon [g/L] | S | 3.69 | 4.33 | 6.12 | 5.76 | B | 43.5 | 30.9 | 28.6 |
Total nitrogen [g/L] | S | 1.03 | 1.23 | 1.81 | 1.68 | B | 7.78 | 8.63 | 6.62 |
Crude protein [g/L] | CA | 2.99 | 5.65 | 7.36 | 6.30 | CA | 16.6 | 28.5 | 15.5 |
Acetate [mg/L] | F | 95 | 27.9 | 109 | 30 | F | 1,762 | 143 | 51.6 |
Propionate [mg/L] | F | <1 | <1 | 15.7 | <1 | F | 868 | 7.60 | 0 |
Butyrate [mg/L] | F | <1 | <1 | <1 | <1 | F | 313 | 0 | 0 |
Calcium [mg/L] | F | 40.8 | 45.8 | 53.8 | 46.2 | F | 91.8 | 221 | 112 |
Iron [mg/L] | F | 1.08 | 1.18 | 2.12 | 1.48 | F | 17.0 | 11.0 | 15.5 |
Potassium [mg/L] | F | 2,140 | 2,220 | 2,560 | 2,500 | F | 3.98 | 4.08 | 4.70 |
Magnesium [mg/L] | F | 11.6 | 9.82 | 12.6 | 7.94 | F | 211 | 84.8 | 139 |
Manganese [mg/L] | F | 0.36 | 0.34 | 0.94 | 0.74 | F | <0.5 | <0.5 | <0.5 |
Phosphorus [mg/L] | F | 47.8 | 42.6 | 66.6 | 51.2 | F | 138.9 | 210.5 | 84.8 |
Potassium [mg/L] | F | 2.140 | 2.220 | 2.560 | 2.500 | F | 3,905 | 3,775 | 3,085 |
Sulfur [mg/L] | F | 14.0 | 23.6 | 18.4 | 24.2 | F | 117 | 106 | 110 |
Surface tension [mN/m] | n. d. | n. d. | n. d. | n. d. | CE | 53.6 | 55.5 | n. d. | |