A novel close-circulating vapor stripping-vapor permeation technique for boosting biobutanol production and recovery

Table 3 Kinetics of ABE fermentation without/with VSVP process

Fermentation parameters	Batch fermentation without VSVP	Batch fermentation with VSVP
Fermentation time (h)	40	59
Glucose consumed (g/L)	66.2 ± 0.7	93.0 ± 0.7
Glucose consumption rate (g/L h)	1.66	1.57
Maximum OD₆₀₀	3.2 ± 0.1	3.7 ± 0.1
Butanol production (g/L)	11.4 ± 0.5	19.6 ± 0.8
Acetone production (g/L)	5.0 ± 0.2	9.8 ± 0.3
Ethanol production (g/L)	1.3 ± 0.1	1.9 ± 0.1
Total ABE production (g/L)	17.7 ± 0.8	31.2 ± 1.2
Butanol productivity^a (g/L h)	0.35 ± 0.02 and 0.23 ± 0.02	0.35 ± 0.02 and 0.34 ± 0.02
ABE productivity^a (g/L h)	0.55 ± 0.02 and 0.34 ± 0.03	0.56 ± 0.02 and 0.49 ± 0.02
Butanol yield (g/g)	0.17 ± 0.01	0.21 ± 0.01
ABE yield (g/g)	0.27 ± 0.01	0.34 ± 0.02
Acetic acid produced (g/L)	1.2 ± 0.1	1.5 ± 0.1
Butyric acid produced (g/L)	1.7 ± 0.1	1.7 ± 0.1

^aThe ratio of products concentration to fermentation time, before and after VSVP process start (at 20 h of ABE fermentation)

ISSN: 1754-6834