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Table 5 Analysis data of the digestates and foams of biogas plant BP B

From: Foam formation in full-scale biogas plants processing biogenic waste

  Digestate Foam Digestate Digestate Digestate Foam Digestate
  August 2011 April 2012 May 2012 June 2012 July 2012
  Index Foaming Foam-free Foaming Foaming Foam-free
TS [%] O 4.82 4.70 3.87 4.87 n. d. n. d. 4.68
VS [% TS] O 72.1 79.9 51.2 55.6 51.9 50.9 53.1
pH [−] CE 7.70 7.50 8.20 7.87 8.06 8.02 7.89
VFA/TIC [−] CA 0.19 0.24 0.14 0.18 0.16 0.17 0.20
NH4-N [g/L] F, S 1.38 (F) 1.89 (F) 1.58 (S) 2.55 (S) n. d. n. d. 3.95 (F)
Total organic carbon [g/L] B 11.1 13.7 17.0 20.6 12.8 8.62 14.0
Total nitrogen [g/L] B 3.77 2.36 5.43 8.81 5.86 5.12 6.36
Crude protein [g/L] CA 14.9 2.83 24.0 39.1 n. d. n. d. 15.0
Acetic acid [mg/L] F 583 564 16.9 601 446 71.0 1,061
Propionic acid [mg/L] F 63.5 162 0 81 17.6 0 125.9
Butyric acid [mg/L] F 0 39.6 0 0 0 0 13.8
Calcium [mg/L] F 85.2 38.8 97.1 119 67 31.6 158
Iron [mg/L] F 4.42 4.69 14.1 4.44 5.82 5.02 6.00
Magnesium [mg/L] F 10.1 7.02 15.8 34.2 11.7 29.0 39
Nickel [mg/L] F <2 <2 8.71 <0.8 <0.8 <0.8 2.4
Phosphorus [mg/L] F 12.8 19.7 70.4 68.8 38.4 6.92 47.4
Potassium [mg/L] F 1,700 1,190 1,602 1,606 1,500 1,546 1,762
Sulfur [mg/L] F 30.8 28.2 59.2 62.2 33.8 33.6 38.6