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Table 2 Final broth and outlet gas composition in batch fermentations under several initial pCO conditions

From: Enhancement of biohydrogen production rate in Rhodospirillum rubrum by a dynamic CO-feeding strategy using dark fermentation

pCO (atm) Acetate CO Total biomass PHB Gases produced
Conversion (%) Total uptake (mol) µ (h−1) CX (g l−1) Cell content (% w w−1) Titre (g l−1) H2 (mol) CO2 (mol)
0.10 21.1 ± 5.2 1.05 ± 0.12 0.049 ± 0.002 0.36 ± 0.04 10.8 ± 2.1 0.04 ± 0.01 1.05 ± 0.05 0.99 ± 0.09
0.20 37.4 ± 4.3 1.89 ± 0.24 0.058 ± 0.006 0.86 ± 0.09 14.8 ± 0.8 0.13 ± 0.01 1.81 ± 0.16 1.11 ± 0.11
0.40 100 ± 11.1 2.71 ± 0.26 0.058 ± 0.004 1.32 ± 0.11 26.5 ± 4.2 0.31 ± 0.01 2.48 ± 0.27 1.57 ± 0.17
0.50 100 ± 5.2 2.61 ± 0.67 0.057 ± 0.005 1.46 ± 0.16 30.4 ± 2.4 0.35 ± 0.03 2.59 ± 0.13 1.67 ± 0.07
0.60 100 ± 2.2 4.57 ± 0.41 0.063 ± 0.008 1.74 ± 0.21 24.1 ± 3.6 0.38 ± 0.06 4.55 ± 0.36 2.76 ± 0.22
0.75 100 ± 2.7 4.06 ± 0.71 0.061 ± 0.007 1.63 ± 0.24 24.8 ± 2.3 0.35 ± 0.04 3.96 ± 0.41 2.50 ± 0.25
1.00 100 ± 14.2 4.94 ± 2.41 0.040 ± 0.005 2.06 ± 0.54 17.4 ± 3.3 0.32 ± 0.09 4.88 ± 0.54 3.22 ± 0.35