Dynamics of an Enzymatic Aerated Reactor
This Demonstration shows the influence of gassing rate and stirrer speed on an enzymatic aerated reactor. The transfer coefficient is a function of and .
The solubility of oxygen in aqueous solutions at ambient temperature and pressure is only between 8 and 10 ppm. This amount of oxygen is quickly consumed in aerobic cultures and must be constantly replaced by sparging (bubbling air through the liquid) .
: substrate concentration (g/L)
: product concentration (g/L)
: dissolved oxygen concentration (mg/L)
: saturation dissolved oxygen concentration (mg/L)
: critical dissolved oxygen concentration (mg/L)
: substrate uptake rate (g/L h)
The transfer coefficient varies with and according to:
The model that includes reaction kinetics and mass balances is described in .
 P. M. Doran, Bioprocess Engineering Principles, Boston: Elsevier, 1995.
 I. J. Dunn, E. Heinzle, J. Ingham and J. E. Prvenosil, Biological Reaction Engineering, 2nd ed., Weinheim, Germany: VCH Verlagsgesellschaft mbH, 2003.