Abstract
A kinetic model of solid state fermentation with temperature deactivation of microorganisms is presented. The experimental results of cultivation of Aspergillus niger on a mixture of wheat bran and beet pulp in temperature range from 26 °C to 40 °C were used to estimate the parameters of the model. The activation energies of growth, thermal deactivation and maintenance have been calculated.
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Abbreviations
- C CX mol/g:
-
proportionality coefficient
- E d J/mol:
-
energy of activation for thermal deactivation
- E g J/mol:
-
energy of activation for growth
- J CO2 mol/gh:
-
carbon dioxide evolution rate
- k d h−1 :
-
thermal deactivation constant
- k g h−1 :
-
growth kinetic constant
- k x h−1 :
-
net growth constant
- m h−1 :
-
maintenance coefficient
- N CO2 mol:
-
amount of carbon dioxide
- N m, CO2 mol:
-
maximum amount of carbon dioxide generated by growth
- t h:
-
time
- X g:
-
dry biomass weight
- X m g:
-
maximum biomass weight
- X ⋆ :
-
dimensionless biomass weight
- X 0,r g:
-
real mass of inoculum
- X 0,a g:
-
apparent mass of inoculum
- X ⋆0 :
-
dimensionless apparent mass of inoculum
- β :
-
dimensionless maintenance coefficient
References
Okazaki, N.; Sugama, S.; Tanaka, T.: Mathematical model for surface culture of Koji mold. J. Ferment. Technol. 58 (1980) 471–476
Rodriguez, L.J.A.; Sastre, L.; Echevarria, J.; Delgado, G.; Bechstedt, W.: A mathematical approach for the estimation of biomass production rate in solid state fermentation. Acta Biotechnol. 8 (1988) 307–310
Bailey, J.E.; Ollis, D.F.: Biochemical Engineering Fundamentals. 2nd edition, p. 443. New York, McGraw Hill 1987
Heynen, J.J.; Roels, J.A.: A macroscopic model describing yield and maintenance relationships in aerobic fermentation processes. Biotechnol. Bioeng. 23 (1981) 739–763
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This work was supported by the Committee of Scientific Research under grant No 3 3401 91 02.
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Szewczyk, K.W., Myszka, L. The effect of temperature on the growth of A. niger in solid state fermentation. Bioprocess Engineering 10, 123–126 (1994). https://doi.org/10.1007/BF00369467
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DOI: https://doi.org/10.1007/BF00369467