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Table 5 Concentrations of water-soluble elements in the samples of 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 (days) Calcium (mg/L) Magnesium (mg/L) Phosphorus (mg/L) Sulfur (mg/L) Potassium (mg/L) Sodium (mg/L)
81 218 210 20.5 33.6 3270 258
88 243 269 12.2 34.0 3230 273
95 212 217 37.9 47.0 2980 252
102 425 343 41.7 39.1 3110 270
109 149 157 40.4 42.6 3170 231
116 92.0 89.5 27.9 41.1 2510 199
123 91.7 134 44.6 42.9 2870 215
130 167 281 53.4 62.5 4630 357
137 161 173 54.8 47.2 2860 250
144 83.5 112 42.8 44.0 3470 238
151 123 169 37.9 40.4 3630 252
158 127 145 52.9 40.0 3220 228
  1. The data from the over-acidification period are marked in bold and those from the foaming period in bold and italics