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Table 2 pH-controlled batch fermentations of C. celer on 10 g/l of glucose at pH 7 and 6, with and without N 2 sparging
| pH 7 | pH 6 | |||
|---|---|---|---|---|
| N2sparging ( Case I) | No sparging ( Case II) | N2sparging ( Case III) | No sparging ( Case IV) | |
| P H2max (kPa) | 8 | 69 | 6 | 74 |
| μ max (h-1) | 1.09 ± 0.09 | 1.09 ± 0.08 | 0.43 ± 0.03 | 0.38 ± 0.05 |
| Biomass concentration (g/l) | 0.99 ± 0.03 | 1.13 ± 0.01 | 1.02 ± 0.03 | 1.01 ± 0.01 |
| YX/ATP (gCDW/mol ATP) | 11.5 ± 0.3 | 9.3 ± 0.1 | 6.3 ± 0.4 | 7.9 ± 0.2 |
| YATP/S (mol ATP/mol glucose) | 3.24 ± 0.03 | 3.18 ± 0.02 | 3.4 ± 0.08 | 3.48 ± 0.17 |
| Q H2 (mmol H2/l/h) | 27.1 ± 1.5 | 33.0 ± 0.1 | 19.9 ± 0.8 | 20.6 ± 0.5 |
| Product yield (mol/mol glucose) | ||||
| YX a | 0.71 ± 0.01 | 0.75 ± 0.03 | 0.72 ± 0.01 | 0.75 ± 0.01 |
| YH2 a | 2.32 ± 0.13 | 2.06 ± 0.13 | 3.10 ± 0.06 | 2.60 ± 0.03 |
| YA a | 1.24 ± 0.01 | 1.28 ± 0.01 | 1.47 ± 0.07 | 1.35 ± 0.02 |
| YF a | 0.37 ± 0.02 | 0.71 ± 0.12 | 0.14 ± 0.07 | 0.33 ± 0.06 |
| YE a | 0.27 ± 0.01 | 0.37 ± 0.01 | 0.10 ± 0.01 | 0.39 ± 0.03 |
| RVEP b | 2.87 ± 0.11 | 2.8 ± 0.12 | 3.31 ± 0.08 | 3.39 ± 0.03 |
| HAc/EtOH | 4.5 ± 0.2 | 3.5 ± 0.1 | 14.2 ± 1.0 | 3.4 ± 0.3 |
| Carbon recovery (%) | 92.6 ± 0.6 | 94.0 ± 0.7 | 94.8 ± 4.2 | 100.3 ± 1.9 |
| Redox recovery (%) | 90.0 ± 0.6 | 97.5 ± 0.6 | 93.2 ± 4.1 | 102.3 ± 2.2 |
