Yeast concentration estimation and prediction with static and dynamic neural network models in batch cultures
✍ Scribed by P. Teissier; B. Perret; E. Latrille; J. M. Barillere; G. Corrieu
- Publisher
- Springer
- Year
- 1996
- Tongue
- English
- Weight
- 424 KB
- Volume
- 14
- Category
- Article
- ISSN
- 1615-7605
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✦ Synopsis
The second fermentation is one of the most important steps in Champagne production. For this purpose, yeasts are grown on a wine based medium to adapt their metabolism to ethanol. Several models built with various stauc and dynamic neural network configurations were investigated. The main objective was to achieve reaI-tirne estimation and prediction of yeast concentration during growth. The model selected, based on recurrent neural networks, was first order with respect to the yeast concentration and to the volume of CO2 released. Temperature and pH were included as model parameters as well. Yeast concentration during growth could thus be estimated with an error lower than 3% ( _+ 1.7 x 10 6 yeasts/ml). From the measurement of initial yeast population and temperature, it was possible to predict the final yeast concentration (after 2I hours of growth) from the beginning of the growth, with about + 3 x 10 ~ yeasts/ml accuracy. So a predictive control strategy of this process could be investigated. List of symbols dVCOJdt RMS RSD T t VCO 2 X Subscripts 0 e f P CO 2 production rate number of observations root mean square residual standard deviaton temperature time volume of CO2 emitted yeast concentration initial value estimated value final value predicted value