Figure 6 . Kinetics of continuous fermentation with 60 g/L
glucose and 5.0 g/L butyric acid at the dilution rate of 1.88
h-1. (a) Time course data of cell density (OD),
glucose, solvents (acetone, butanol, and ethanol), and acids (acetic
acid and butyric acid) in the reactor outlet stream; (b) Butanol and ABE
yields and butanol productivity.