Abstract
Ethanol, as an alternative energy resource, has become a subject of great interest due to the current surge in price of crude oil. Environmental concerns have promoted new applications and markets for ethanol. Kinetic modeling of ethanol production is very important from design and scale-up aspects of fermentors. In the present work, a kinetic model has been developed for the batch fermentation of crude whey for ethanol production by Kluyveromyces marxianus. Parameters of the kinetic model have been determined based on experimental data given by Zafar and Owais (Biochem Eng J 27, 295–298, 2006). Results have been compared by carrying out computer simulation. The kinetic model proposed in this study provides good predictions for growth of biomass, substrate consumption and ethanol production for all types of substrate-microbe systems.
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Abbreviations
- \(K_{\text{ipx}}\) :
-
Inhibition constant of growth by product (g/l)
- \(K_{\text{s}}\) :
-
Monod growth constant for the substrate (g/l)
- \(K_{\text{sI}}\) :
-
Inhibition coefficient for cell growth on glucose
- \(K_{\text{p}}\) :
-
Saturation coefficient for cell growth on ethanol
- \(K_{\text{pI}}\) :
-
Inhibition coefficient for cell growth on ethanol
- \(K{}_{\text{p/s}}\) :
-
Monod product constant for the substrate (g/l)
- \(K_{\text{r}}\) :
-
Monod growth constant for the specific biotin concentration (g/l)
- \(m_{\text{s}}\) :
-
Maintenance coefficient (g substrate/(g cells h))
- \(P\) :
-
Product (L-glutamic acid) concentration (g/l)
- \(q_{{{\text{p}},\hbox{max} }}\) :
-
Maximal specific production rate (1/h)
- \(S\) :
-
Substrate (glucose) concentration (g/l)
- \(t\) :
-
Time (h)
- \(X\) :
-
Biomass concentration (g/l)
- \(X_{\text{m}}\) :
-
Maximum cell concentration (g/l)
- \(Y_{\text{x/s}}\) :
-
Yield coefficient biomass from substrate (g/g)
- \(Y_{\text{p/s}}\) :
-
Yield coefficient product from substrate (g/g)
- \(\mu\) :
-
Speicific growth rate (1/h)
- \(\mu_{\hbox{max} }\) :
-
Maximal specific growth rate (1/h)
- \(\alpha\) :
-
Growth-associated product formation coefficient (g/g)
- \(\beta\) :
-
Non-growth associated product formation coefficient(g/g h)
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Suresh, S., Srivastava, V.C., Sakthivel, S., Arisutha, S. (2018). Kinetic Modeling of Ethanol Production for Substrate–Microbe System. In: Kumar, S., Sani, R. (eds) Biorefining of Biomass to Biofuels. Biofuel and Biorefinery Technologies, vol 4. Springer, Cham. https://doi.org/10.1007/978-3-319-67678-4_16
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