Mathematical modeling of a continuous alcoholic fermentation process in a two-stage tower reactor cascade with flocculating yeast recycle


Autoria(s): Oliveira, Samuel Conceição de; Castro, Heizir Ferreira de; Visconti, Alexandre Eliseu Stourdze; Giudici, Reinaldo
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

21/10/2015

21/10/2015

01/03/2015

Resumo

Experiments of continuous alcoholic fermentation of sugarcane juice with flocculating yeast recycle were conducted in a system of two 0.22-L tower bioreactors in series, operated at a range of dilution rates (D (1) = D (2) = 0.27-0.95 h(-1)), constant recycle ratio (alpha = F (R) /F = 4.0) and a sugar concentration in the feed stream (S (0)) around 150 g/L. The data obtained in these experimental conditions were used to adjust the parameters of a mathematical model previously developed for the single-stage process. This model considers each of the tower bioreactors as a perfectly mixed continuous reactor and the kinetics of cell growth and product formation takes into account the limitation by substrate and the inhibition by ethanol and biomass, as well as the substrate consumption for cellular maintenance. The model predictions agreed satisfactorily with the measurements taken in both stages of the cascade. The major differences with respect to the kinetic parameters previously estimated for a single-stage system were observed for the maximum specific growth rate, for the inhibition constants of cell growth and for the specific rate of substrate consumption for cell maintenance. Mathematical models were validated and used to simulate alternative operating conditions as well as to analyze the performance of the two-stage process against that of the single-stage process.

Formato

469-479

Identificador

http://link.springer.com/article/10.1007%2Fs00449-014-1286-2

Bioprocess And Biosystems Engineering. New York: Springer, v. 38, n. 3, p. 469-479, 2015.

1615-7591

http://hdl.handle.net/11449/129075

http://dx.doi.org/10.1007/s00449-014-1286-2

WOS:000350350000007

Idioma(s)

eng

Publicador

Springer

Relação

Bioprocess And Biosystems Engineering

Direitos

closedAccess

Palavras-Chave #Mathematical modeling #Continuous ethanol fermentation #Flocculating yeast #Tower reactor cascade
Tipo

info:eu-repo/semantics/article