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Table 4 Concentrations of organic acids in the digestates from the primary digester

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

Time (d) Acetate (mg/L) Propionate (mg/L) Butyrate (mg/L) Lactate (mg/L) VFAS (ő£AcProBut) (mg/L)
81 19.8 <1 <1 13.0 19.8
88 130 27.0 <1 <1 157
95 2023 85.2 38.0 <1 2,146
102 8827 655 602 <1 10,084
109 2586 119 44.3 27.8 2749
116 2832 61.0 24.2 30.5 2917
123 295 18.7 <1 30.0 314
130 119 26.4 <1 60.0 145
137 149 32.4 <1 53.8 181
144 88 17.2 <1 52.3 105
151 77 20.9 <1 30.6 98.0
158 199 23.0 <1 69.1 222
  1. The data from the over-acidification period are marked in bold and those from the foaming period in bold and italics