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Fuel ethanol production from sweet sorghum using repeated-batch fermentation.

Shigeru Chohnan1, Megumi Nakane, M Habibur Rahman

  • 1Department of Bioresource Science, Ibaraki University College of Agriculture, Ibaraki 300-0393, Japan.

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Sweet sorghum can be efficiently fermented into ethanol using Saccharomyces cerevisiae without pasteurization. This repeated-batch method allows for cell recycling over 16 cycles, enabling broader use of sorghum varieties for biofuel production.

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Area of Science:

  • Biotechnology
  • Biochemical Engineering
  • Sustainable Energy

Background:

  • Sweet sorghum is a promising feedstock for bioethanol production.
  • Traditional fermentation methods can be costly and energy-intensive.
  • Optimizing fermentation processes is crucial for economic viability.

Purpose of the Study:

  • To evaluate the efficiency of repeated-batch fermentation of sweet sorghum for ethanol production.
  • To assess the recyclability and performance of Saccharomyces cerevisiae in this process.
  • To determine the feasibility of using diverse sweet sorghum varieties.

Main Methods:

  • Utilized three distinct varieties of sweet sorghum as feedstock.
  • Employed a repeated-batch fermentation strategy without pasteurization or acidification.
  • Recycled Saccharomyces cerevisiae cells for multiple fermentation cycles (up to 16).

Main Results:

  • Achieved efficient ethanol production from all tested sweet sorghum varieties.
  • Demonstrated successful recycling of Saccharomyces cerevisiae cells over 16 cycles with sustained ethanol yields.
  • Confirmed the robustness of the fermentation technique across different sorghum types.

Conclusions:

  • Repeated-batch fermentation without pasteurization is an effective method for sweet sorghum ethanol production.
  • Saccharomyces cerevisiae demonstrates excellent recyclability, enhancing process sustainability.
  • This approach broadens the potential of sweet sorghum as a versatile biofuel feedstock.