This is a nonlinear system of differential and algebriac equations, that describe the dynamics of a continuous bioreactor. The bioreactor simulates the production of ethanol through yeast fermentation. The model is described in:

Z. K. Nagy, Model Based Control of a Fermentation Bioreactor using Optimally Designed Artificial Neural Networks, Chemical Engineering Journal, 127, 95-109, 2007.

Additional nonlinear, first principles models can be found at:

http://www.hedengren.net/research/models.htm

Special thanks to Zoltan Nagy for his submission to this collection of models.