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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.