A solid-state bioreactor coupled with forced aeration and pressure oscillation.

Area of Science:

• Biotechnology and biochemical engineering.
• Microbial fermentation technology.

Background:

• Solid-state fermentation (SSF) is crucial for enzyme production.
• Controlling temperature in SSF bioreactors is challenging, impacting microbial growth and product yield.
• Existing static systems exhibit significant temperature variations.

Purpose of the Study:

• To develop and evaluate a novel solid-state bioreactor design.
• To assess the bioreactor's temperature control capabilities.
• To determine the impact of the new bioreactor on cellulase and beta-glucosidase production.

Main Methods:

• A novel solid-state bioreactor was designed with periodic pressure oscillation and forced aeration.
• The bioreactor's temperature control was evaluated against a static tray system.
• Cellulase and beta-glucosidase production by Penicillium decumbens JUA 10 was quantified.

Main Results:

• The novel bioreactor maintained maximal temperature variation within +1.5°C at 4 atm and 6 cm bed depth, compared to +6.8°C in static systems.
• Highest cellulase activity reached 15 IU/g substrate dry matter.
• Highest beta-glucosidase activity reached 51 IU/g substrate dry matter at 96 hours.

Conclusions:

• The novel solid-state bioreactor design offers superior temperature control compared to static systems.
• This improved temperature regulation significantly enhances cellulase and beta-glucosidase production.
• The developed bioreactor shows promise for efficient industrial enzyme production.