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Table 8 Analysis data of samples of the biogas plant BP C

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

  Digester D1 Digester D2 Digester D3
  Index Digestate Digestate Digestate Foam
TS [%] O 3.55 3.44 3.20 3.43
VS [% TS] O n. d. 69.3 69.8 70.7
pH [−] CE 7.33 7.24 7.36 7.64
VFA/TIC [−] CA 0.05 0.06 0.08 0.06
NH4-N [g/L] F 0.86 0.94 0.99 1.20
Total organic carbon [g/L] CE 1.20 1.11 2.13 1.22
Total nitrogen [g/L] CE 1.54 1.46 2.01 1.81
Acetate [mg/L] F 2.2 21 30 59
Propionate [mg/L] F <1 5.5 3.6 10
Butyrate [mg/L] F <1 <1 <1 <1
Palmitic acid [%] E 36.8 39.2 28.4 27.7
Stearic acid [%] E 28.7 29.9 19.8 19.3
Oleic acid [%] E 21.7 18.1 43.5 43.2
Linoleic acid [%] E 10.9 9.6 5.8 6.8
Linolenic acid [%] E 1.9 3.2 2.5 2.9
Surface tension [mN/m] CE 72 72 71 71
  1. Taken on 14th December 2009.