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Table 1 Analytical data of the digestates from the primary and secondary digesters during stable operation (n = 5)

From: Process upsets in a full-scale anaerobic digestion bioreactor: over-acidification and foam formation during biogas production

  Primary digester Secondary digester
TS (%) 6.34 ± 0.54 4.98 ± 0.60
VS (% TS) 74.2 ± 0.53 68.2 ± 0.75
pH (−) 7.80 ± 0.15 7.93 ± 0.14
VFA/TIC (−) 0.19 ± 0.01 0.16 ± 0.01
NH4-N (g/L) 1.131 ± 153 1.680 ± 201
Acetate (mg/L) 126 ± 49.2 12.1 ± 11.8
Propionate (mg/L) 24 ± 5.76 10.7 ± 10.2
Butyrate (mg/L) <1 <1