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Design of Solid-State Fermentation Systems for Polymer Hydrolytic Extracellular Enzyme Production by Filamentous Fungi
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A novel structured bioreactor for solid-state fermentation.

Hongzhang Chen1, Qin He

  • 1National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, People's Republic of China. hzchen@home.ipe.ac.cn

Bioprocess and Biosystems Engineering
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Summary
This summary is machine-generated.

A novel solid-state bioreactor enhances microbial growth and spore viability. This innovative design offers improved loading capacity and temperature control for industrial applications in bacterial fermentation.

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Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Microbial Fermentation

Background:

  • Solid-state fermentation (SSF) is crucial for microbial processes but faces challenges in heat transfer and loading efficiency.
  • Conventional fermenters often exhibit limitations in optimizing conditions for bacterial growth and spore production.

Purpose of the Study:

  • To design and evaluate a novel, patented solid-state bioreactor with a honeycomb loading device for enhanced SSF performance.
  • To assess the impact of the bioreactor's design on loading coefficient, temperature control, and microbial viability.

Main Methods:

  • A 251 L solid-state bioreactor with a honeycomb loading device was constructed and tested.
  • Performance was evaluated by measuring the loading coefficient, temperature variations during fermentation, and spore viability of Bacillus cereus DM423.
  • Temperature control was managed using air pressure pulsation and an external water jacket.

Main Results:

  • The novel bioreactor achieved a loading coefficient of 66.87%, nearly double that of conventional fermenters.
  • Air pressure pulsation resulted in significantly lower maximal temperature variations (7.7 °C) compared to a water jacket (19.8 °C).
  • Higher average living spore counts of Bacillus cereus DM423 were obtained in the novel bioreactor compared to flask cultures.

Conclusions:

  • The designed solid-state bioreactor demonstrates superior loading capacity and improved temperature control.
  • Air pressure pulsation is an effective method for managing temperature in SSF, promoting microbial growth.
  • This novel bioreactor shows significant potential for the industrial-scale application of solid-state fermentation using bacterial cultures.