Table 4.
Volumetric hydrogen productivity and the evolution of metabolic compounds in photo-fermentation using a 50-mL bioreactor
| Assay | Ci.lact (g/L) | Vbiogas (mL) | Productivity (mmol H2/L day) | Ci.lac (g/L) | Cf.lac (g/L) | Ci.acet (g/L) | Cf.acet (g/L) | Ci.prop (g/L) | Cf.prop (g/L) | Ci.but (g/L) | Cf.but (g/L) | Ci.form (g/L) | Cf.form (g/L) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 10.14 | 77.67 | 17.12 ± 0.99 | 0.10 | 6.18 | 1.59 | 2.13 | 0.15 | 0.11 | 2.44 | 3.97 | 0.84 | 0.55 |
| 13 | 6.43 | 98.33 | 37.23 ± 3.08 | 12.91 | 11.46 | 1.46 | 1.55 | 0.17 | 0.14 | 1.69 | 4.92 | 0.39 | 0.47 |
| 14 | 7.96 | 100.00 | 31.57 ± 4.88 | 14.25 | 11.69 | 1.31 | 0.97 | 0.15 | 0.62 | 0.48 | 4.78 | 0.49 | 0.35 |
| 15a | 0.00 | 23.00 | 0.48 ± 0.13 | 19.32 | 6.27 | 2.27 | 5.28 | 0.31 | 4.44 | 0.21 | 0.71 | 0.13 | 0.03 |
| 16a | 0.00 | 21.33 | 0.37 ± 0.09 | 18.27 | 1.67 | 3.01 | 6.06 | 0.26 | 5.21 | 0.00 | 1.20 | 0.04 | 0.00 |
i initial, f final, lact lactose, lac lactic acid, acet acetic acid, prop propionic acid, but butyric acid, form formic acid
aBottle browning was observed