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Table 2 Comparison of process parameters between CSTR (Bassani et al. 2015) and fed-batch (present work) bioCH4 production approaches

From: Conversion of H2 and CO2 to CH4 and acetate in fed-batch biogas reactors by mixed biogas community: a novel route for the power-to-gas concept

  Bassani et al. (2015)a Present work
No external CO2 External CO2 added
Control H2 added Control H2 added Control H2 added
Biogas composition (%)
 CH4 69.7 ± 0.3 88.9 ± 2.4 17.71 ± 1.15 79.77 ± 2.31 0.00 95.53 ± 1.79
 CO2 30.3 ± 0.3 8.8 ± 3.2 73.63 ± 3.61 17.71 ± 0.90 0.00 4.47 ± 1.34
 H2 0 2.3 ± 1.8 0.0 2.51 ± 0.82 0.0 0.00
Gas production (mL L−1 h−1)
 CH4 2.75 ± 0.58 4.17 ± 0.50 1.51 ± 0.07 6.78 ± 0.20 0.00 ± 0.00 6.21 ± 0.12
 CH4 from H2 0.0 1.41 0.00 4.27 0.00 6.21
 CO2 1.21 ± 0.25 0.42 ± 0.13 4.20 ± 0.21 1.51 ± 0.08 0.00 ± 0.00 0.29 ± 0.09
 H2 injection rate (mL L−1 h−1) 0.00 8.00 ± 1.17 0.00b 22.66 ± 0.20b 0.00b 20.96 ± 0.23b
 H2 consumption (mL L−1 h−1) 0.0 7.42 ± 1.08 0.00 ± 0.00 22.44 ± 0.19 0.00 ± 0.00 20.96 ± 0.02
 H2 consumption (%) 0.0 92.7 0.0 99.06 0.0 100.00
 pH 7.74 ± 0.16 8.17 ± 0.04 8.66 ± 0.19c 9.38 ± 0.11c 8.29 ± 0.04c 7.89 ± 0.20c
Organic acids (mM)
 Acetate nd nd nd nd 0.33 1.48
 Butyrate nd nd nd nd 0.00 0.04
 Isovalerate    nd nd 0.02 0.10
  1. a Mesophilic data
  2. b Estimated from daily dose
  3. c At the end of the experiment; nd not determined
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