Table 1.
Maximum specific growth rates of C. carboxidivorans as well as the final product concentrations and alcohol‐to‐acid ratios after 144 h measured in autotrophic mono‐cultures of C. carboxidivorans and co‐cultures of C. carboxidivorans and C. kluyveri in pH‐controlled batch processes with continuous gassing in stirred‐tank reactors with 100 or 800 mbar CO in the inlet gas phase
| p CO,in | 800 mbar | 100 mbar | ||
|---|---|---|---|---|
| Mono‐culture | Co‐culture | Mono‐culture | Co‐culture | |
| µ max, h−1 | 0.16 | 0.15 | 0.17 | 0.15 |
| CDW C. carboxidivorans , g l−1 | 0.41 | 0.47 | 0.31 | 0.32 |
| CDW C. kluyveri , g l−1 | – | 0.06 | – | 0.12 |
| Acetate, g l−1 | 1.87 ± 0.01 | 1.20 ± 0.02 | 4.50 | 3.24 ± 0.2 |
| Butyrate, g l−1 | 0.14 ± 0.04 | 0.31 ± 0.05 | 0.19 | 0.77 ± 0.04 |
| Hexanoate, g l−1 | 0.00 | 0.36 ± 0.03 | 0.00 | 0.31 ± 0.07 |
| Ethanol, g l−1 | 2.09 ± 0.03 | 2.09 ± 0.20 | 0.41 | 0.63 ± 0.08 |
| Butanol, g l−1 | 0.25 ± 0.05 | 0.84 ± 0.06 | 0.07 | 0.32 ± 0.06 |
| Hexanol, g l−1 | 0.00 | 0.24 ± 0.01 | 0.00 | 0.05 ± 0.02 |
| EtOH/Ac, g g−1 | 1.12 | 1.74 | 0.09 | 0.19 |
| ButOH/But, g g−1 | 1.77 | 2.73 | 0.39 | 0.40 |
| HexOH/Hex, g g−1 | – | 0.66 | – | 0.16 |
Errors indicate the deviation of the minimum and maximum value from the mean value of two independent batch processes (T = 37°C; pH = 6.0; P V −1 = 11.7 W l−1; F gas = 5 l h−1).