Model of Continuous Cheese Whey Fermentation by Candida Pseudotropicalis

Authors: Rudy Agustriyanto, Akbarningrum Fatmawati

Abstract:

The utilization of cheese whey as a fermentation substrate to produce bio-ethanol is an effort to supply bio-ethanol demand as a renewable energy. Like other process systems, modeling is also required for fermentation process design, optimization and plant operation. This research aims to study the fermentation process of cheese whey by applying mathematics and fundamental concept in chemical engineering, and to investigate the characteristic of the cheese whey fermentation process. Steady state simulation results for inlet substrate concentration of 50, 100 and 150 g/l, and various values of hydraulic retention time, showed that the ethanol productivity maximum values were 0.1091, 0.3163 and 0.5639 g/l.h respectively. Those values were achieved at hydraulic retention time of 20 hours, which was the minimum value used in this modeling. This showed that operating reactor at low hydraulic retention time was favorable. Model of bio-ethanol production from cheese whey will enhance the understanding of what really happen in the fermentation process.

Keywords: Cheese whey, ethanol, fermentation, modeling.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1333800

References:

[1] A.E. Ghaly, A.A. Taweel, "Kinetic modeling of bacth production of ethanol from cheese whey", Biomass and Bioenergy, vol. 6, no. 6, pp. 465-478, 1994.
[2] A.E. Ghaly, A.A. Taweel, "Kinetic modeling of continuous production of ethanol from cheese whey", Biomass and Bioenergy, vol 12, no 6, pp. 461-472, 1997.
[3] A. R. Leite; W. V. Guimarães; E. F. de Araújo; D. O. Silva, "Fermentation of sweet whey by Recombinant Escherichia coli KO11," in Braz. J. Microbiol, vol. 31, no.3, 2000.
[4] B.A. Friend, M.L. Cunningham, K.M. Shahani, "Industrial alcohol production via whey and grain fermentation", Agricultural Waste, vol 4, pp. 55-63, 1982.
[5] F. Kargi, S. Ozmihci, "Utilization of cheese whey powder (CWP) for ethanol fermentations: effect of operating parameters", Enzyme and Microbial Technology, vol. 38, pp. 711-718, 2006.
[6] H.W. Blanch, D. S. Clark, Biochemical Enginering. New York: Marcel Dekker Inc, 1997, pp.185.
[7] M. L. Shuler, F. Kargi, Bioprocess Engineering Basic Concep. New Jersey: Prentice-Hall, 1992, pp. 150.
[8] S. Zafar, M. Owais, "Ethanol production from crude whey by Kluyveromyces marxianus, "Biochemical Engineering Journal, vol. 27, pp. 295-298, 2005.