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Table 3 Performance data for control and upgrading reactors at different experimental phases (mean  ±  SD)

From: Impact of operational conditions on methane yield and microbial community composition during biological methanation in in situ and hybrid reactor systems

Phases I II III IV V VI
Reactor CR UR CR UR CR UR CR UR CR UR CR UR
Biogas yield (mL g−1VS) 244.72  ±  8.29 241.15  ±  11.01 245.59  ±  4.52 298.11  ±  4.84 232.47  ±  4.16 218.43  ±  9.70 263.18  ±  7.16 349.90  ±  3.81 231.00  ±  4.49 305.43  ±  2.55 205.68  ±  6.18 246.00  ±  4.65
CH4 yield (mL g−1VS) 144.77  ±  2.38 143.50  ±  3.95 146.34  ±  2.25 185.44  ±  1.94 133.52  ±  2.22 132.96  ±  5.20 142.19  ±  1.83 204.15  ±  1.48 141.70  ±  6.05 193.79  ±  4.24 134.03  ±  2.58 164.60  ±  2.95
Gas compositions (%)             
 CH4 58.24  ±  1.09 59.14  ±  1.25 59.88  ±  0.66 39.97  ±  0.60 57.57  ±  0.13 40.76  ±  0.45 53.70  ±  0.36 38.69  ±  0.38 58.55  ±  0.50 42.58  ±  0.59 56.10  ±  1.55 38.65  ±  0.77
 CO2 41.76  ±  1.09 40.86  ±  1.25 40.41  ±  0.68 28.59  ±  0.59 42.43  ±  0.13 26.19  ±  0.14 46.30  ±  0.36 28.04  ±  0.44 41.45  ±  0.50 23.13  ±  0.51 43.90  ±  1.55 19.11  ±  0.24
 H2 31.44  ±  0.15 33.05  ±  0.31 33.27  ±  0.11 34.29  ±  0.08 42.24  ±  0.83
H2 consumption (%) 24.96  ±  0.09 45.99  ±  0.36 17.35  ±  0.70 31.80  ±  1.12 53.85  ±  2.71
pH 7.92  ±  0.02 7.94  ±  0.01 7.94  ±  0.01 8.10  ±  0.01 8.15  ±  0.07 8.28  ±  0.03 7.91  ±  0.03 8.11  ±  0.03 7.82  ±  0.06 8.04  ±  0.05 7.77  ±  0.02 7.95  ±  0.08
TVFA (mM) 18.99  ±  5.33 17.12  ±  5.37 30.73  ±  3.68 44.55  ±  0.36 30.56  ±  0.45 66.63  ±  9.85 37.67  ±  2.29 62.18  ±  7.42 40.18  ±  5.06 65.08  ±  3.28 36.66  ±  1.89 98.14  ±  5.50
AA (mM) 12.04  ±  4.02 12.07  ±  4.71 20.58  ±  1.91 35.68 18.32  ±  1.68 53.50  ±  9.05 20.57  ±  2.97 45.83  ±  9.10 25.59  ±  3.66 50.01  ±  2.19 24.87  ±  0.79 80.63  ±  5.54
PA (mM) 6.95  ±  1.31 5.05  ±  0.66 10.15  ±  1.77 8.87  ±  0.36 12.24  ±  1.23 13.13  ±  0.95 17.10  ±  0.67 16.36  ±  1.67 14.58  ±  1.59 15.07  ±  1.56 11.79  ±  1.10 17.51  ±  0.04
TAN (g L−1) 2.48  ±  0.06 2.52  ±  0.02 2.57  ±  0.01 2.77  ±  0.16 3.32  ±  0.22 2.88  ±  0.14 3.12  ±  0.11 3.17  ±  0.03 2.80  ±  0.15 2.89  ±  0.09 2.65  ±  0.11 2.80  ±  0.07
  1. CR control reactor; UR in situ upgrading reactor; TVFA total volatile fatty acid; AA acetic acid; PA propionic acid