Abstract
In this work, the effect of initial sugar concentration and temperature on the production of ethanol by Saccharomyces cerevisiae CCA008, a flocculent yeast, using cashew apple juice in a 1L-bioreactor was studied. The experimental results were used to develop a kinetic model relating biomass, ethanol production and total reducing sugar consumption. Monod, Andrews, Levenspiel and Ghose and Tyagi models were investigated to represent the specific growth rate without inhibition, with inhibition by substrate and with inhibition by product, respectively. Model validation was performed using a new set of experimental data obtained at 34 °C and using 100 g L−1 of initial substrate concentration. The model proposed by Ghose and Tyagi was able to accurately describe the dynamics of ethanol production by S. cerevisiae CCA008 growing on cashew apple juice, containing an initial reducing sugar concentration ranging from 70 to 170 g L−1 and temperature, from 26 to 42 °C. The model optimization was also accomplished based on the following parameters: percentage volume of ethanol per volume of solution (%V ethanol/V solution), efficiency and reaction productivity. The optimal operational conditions were determined using response surface graphs constructed with simulated data, reaching an efficiency and a productivity of 93.5% and 5.45 g L−1 h−1, respectively.
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Abbreviations
- X v :
-
Cell alive concentration (g L−1)
- X d :
-
Cell dead concentration (g L−1)
- X T :
-
Cell total concentration (g L−1)
- S :
-
Substrate concentration (g L−1)
- S 0 :
-
Initial substrate concentration (g L−1)
- P :
-
Product concentration (g L−1)
- P max :
-
Product concentration when cell growth ceases (g L−1)
- t :
-
Time (h)
- y i :
-
Experimental values
- y pi :
-
Calculated values
- n :
-
Number of experimental points
- n v :
-
Number of variables estimated
- k d :
-
Specific rate cell death (h−1)
- K s :
-
Substrate saturation constant (g L−1)
- K i :
-
Substrate inhibition constant (g L−1)
- m S :
-
Specific rate cell maintenance (h−1)
- p :
-
Number of model parameters
- \(F_{\text{tab}}\) :
-
Tabled value for the Fisher Test F
- Y P/X :
-
Yield of product based on cell growth (g g−1)
- Y X/S :
-
Yield of cell growth based on substrate consumption (g g−1)
- Y P/S :
-
Yield of product based on substrate consumption (g g−1)
- \({\mathcal{E}}^{ \exp }\) :
-
Apparent experimental error
- µ max :
-
Maximum specific growth rate of cells (h−1)
- µ :
-
Specific growth rate of cells (g L−1 h−1)
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The authors would like to thank the Brazilian research-funding agencies BNB, CNPq FUNCAP and CAPES.
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Pinheiro, Á.D.T., da Silva Pereira, A., Barros, E.M. et al. Mathematical modeling of the ethanol fermentation of cashew apple juice by a flocculent yeast: the effect of initial substrate concentration and temperature. Bioprocess Biosyst Eng 40, 1221–1235 (2017). https://doi.org/10.1007/s00449-017-1782-2
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DOI: https://doi.org/10.1007/s00449-017-1782-2