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Modeling and Simulation of Alcoholic Fermentation of Sugarcane Blackstrap Molasses

Soroush, Mohammad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50687 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaee, Sohila
  7. Abstract:
  8. Fed-batch fermentation is a valuable and cost-effective method for bio-based production of various products such as ethanol, which has various applications in various industries.In recent years, bioethanol production has been given special attention in many countries. For this reason, the mathematical modeling of production of these products is very important for their optimal and cost-effective production. Given the transient and dynamic nature of fermentation and its specific complexity, mathematical modeling of fed-batch bioreactors is difficult and complicated. In this research, an unstructured model was used to predict the production of ethanol from blackstrap sugar cane molasses based on the Monod model. These equations consist of 5 ordinary differential equations (ODE) solved by the numerical method. Also, in this modeling, at first solved the steady equations and then the effect of the time parameter in the equations was observed. In addition, modeling for different modes of specific growth rate, μ, has been investigated considering the dependence of this parameter on the instantaneous concentration of the substrate or without its dependence. Finally, the effect of variations of various variables such as fermentation time, t, fermenter filling-up time, T, and time constant K, are investigated in each of the above modes. For this purpose, the intervals 1: 5h, 3:10h, and -1:1 h-1 were considered for fermentation time, fermenter filling-up time,and time constant , in which case two parameters remained constant and by changing the parameter The selective impact of this has been examined. The results indicate that in a steady state condition, increasing feeding rate time has a increasing trend when K> 0 and decreasing trend when K <0. But in an unsteady state condition, with increasing fermentation time (t) when K <0, the variables S, X and P decrease and rs, rx and rp increase. It should also be noted that in all intervals of K, by increasing this parameter, the substrate concentrations, cell mass, and the target product undergo a rising trend. However, the process of how substrate, cell mass, and ethanol changes are anticlimactic. By comparing the results in an unsteady state, it is clear that the constant or variable of the specific growth rate did not have a significant effect on the results
  9. Keywords:
  10. Modeling ; Fed-Batch Culture ; Sugar Cane ; Cane Molasses ; Alcoholic Fermentation ; Ethanol Fermentation ; Ethanol Fermentation

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