Table 4 Comparison of steady-state H2 and biomass production by C. saccharolyticus, C. kristjanssonii and their co-culture in glucose-limited chemostat cultivations at two different dilution rates (yeast extract, 1 g L-1; pH 6.7; 70°C).
Organism(s) | D(h-1) | [mol (mol C6)-1] | (mmol L-1h-1) | (mmol gCDW-1h-1) | Biomass concentration (gCDW L-1) | Ysx[gCDW (mol C6)-1] | Residual glucose (mM) |
|---|---|---|---|---|---|---|---|
C. saccharolyticus | 0.06 | 3.5 ± 0.1 | 4.9 ± 0.14 | 13.2 ± 0.1 | 0.38 ± 0.01 | 15.8 ± 0.2 | 0 |
0.15 | 3.1 ± 0.2 | 7 ± 0.3 | 24.4 ± 1 | 0.29 ± 0.03 | 19.3 ± 1.1 | 8.6 ± 0.6 | |
C. kristjanssonii | 0.06 | 3.5 ± 0.1 | 4.8 ± 0.1 | 17.8 ± 0.5 | 0.27 ± 0.01 | 11.7 ± 0.0 | 0 |
0.15 | 3.0 ± 0.1 | 10.3 ± 0.16 | 34.6 ± 1.6 | 0.3 ± 0.02 | 13.0 ± 0.1 | 0.2 ± 0.0 | |
Co-culture | 0.06 | 3.7 ± 0.0 | 4.8 ± 0.2 | 14.8 ± 0.8 | 0.33 ± 0.03 | 15.4 ± 0.8 | 0 |
0.15 | 3.5 ± 0.0 | 10.4 ± 0.14 | 21.4 ± 0.8 | 0.49 ± 0.01 | 24.6 ± 0.8 | 0 |