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Table 5 The measured dissolved hydrogen concentration under different fermentation conditions compared with the modela

From: A kinetic model for quantitative evaluation of the effect of hydrogen and osmolarity on hydrogen production by Caldicellulosiruptor saccharolyticus

Experiment 5 6 7 8
H2 concentration 3.0% 9.1% 7.5% 3.6%
H2 productivity 8.4 mmol/L/hour 6.0 mmol/L/hour 6.2 mmol/L/hour 10.7 mmol/L/hour
H2aq 0.28 ± 0.01 mmol/L 0.8 ± 0.5 mmol/L 0.34 ± 0.02 mmol/L 0.9 ± 0.5 mmol/L
H2aq at equilibrium 0.022 mmol/L 0.069 mmol/L 0.056 mmol/L 0.027 mmol/L
Oversaturation 12.5 ± 0.3 12 ± 7 12.5 ± 0.4 34 ± 19
H2aq (model) 0.96 mmol/L 1.50 mmol/L 1.36 mmol/L 1.22 mmol/L
  1. aHydrogen (H2) concentration, H2 productivity and H2aq are the experimentally determined H2 concentration in the gas phase, H2 productivity and dissolved H2 concentration, respectively. H2aq at equilibrium is the corresponding theoretical H2aq at equilibrium with the gas. Oversaturation is the experimentally determined degree of H2 oversaturation in the liquid. H2aq (model) is the dissolved H2 concentration calculated by the model under the same conditions.