Table 1 Oxygen transfer coefficient k L a (h−1) value for fermentations with conventional air sparged and MBD sparged fermentations (n = 2)
From: Microbubble assisted polyhydroxybutyrate production in Escherichia coli
Air supply | Air-sparger | Air-sparger | Air-sparger | Air-sparger | Air-sparger | Air-sparger | MBD |
|---|---|---|---|---|---|---|---|
Agitation rate (rpm) | 350 | 350 | 500 | 500 | 750 | 750 | 350 |
Air sparge rate (vvm) | 0.4 | 0.8 | 0.4 | 0.8 | 0.4 | 0.8 | – |
kLa (h−1) | 16.81 | 22.01 | 23.47 | 27.53 | 32.86 | 34.29 | 23.12 |
OD600 (48 h) | 3.66 | 6.21 | 5.99 | 7.98 | 10.68 | 13.86 | 8.17 |
PHB % (48 h) | 20.25 | 23.93 | 26.12 | 46.46 | 47.33 | 54.08 | 43.14 |