Solid-State Fermentation Bioreactor with Segmented Trays
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Solution Overview
Problem
Current bioreactors face challenges in scaling and reproducibility due to difficulties in controlling temperature, humidity, and substrate concentration gradients during solid-state fermentation processes, leading to enzyme denaturation and inconsistent production of bioactive substances.
Innovation Solution
A bioreactor system that includes a fixed bed with natural convection and forced draft, a rolling drum with oscillating motion, and a tray bioreactor, all designed to precisely control temperature, humidity, and oxygen concentration, using lignocellulosic materials and macromycetes fungi for optimal production of lignocellulosic enzymes and polysaccharides through solid-state fermentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid-state fermentation is used to produce enzymes, then productivity and stability are improved, but temperature control becomes difficult leading to enzyme denaturation
Solution Approach 1:
The bioreactor is divided into multiple independent modules (trays or chambers) that can be individually controlled. Each module contains substrate and inoculum layers separated by permeable barriers, allowing localized temperature and humidity control. This segmentation enables precise thermal management while maintaining high enzyme production through solid-state fermentation.
Solution Approach 2:
Permeable barriers or membranes are introduced as intermediary elements between substrate layers and heating/cooling elements. These intermediaries facilitate controlled heat and mass transfer, allowing temperature regulation without direct contact between thermal processing elements and the fermentation substrate, thus preventing enzyme denaturation while maintaining productivity.
2Productivity
If bag or bed culture methods are used, then scalability is improved, but control of heat transfer and mass transfer deteriorates
Solution Approach 1:
The culture system is segmented into multiple shallow trays or modular chambers rather than using deep bags or beds. This segmentation increases the surface area to volume ratio, improving heat dissipation and mass transfer efficiency. Each module can be independently managed, enabling scalable production while maintaining reliable control over thermal and mass transfer conditions.
Solution Approach 2:
The system transitions from three-dimensional deep bed culture to two-dimensional shallow tray culture. This dimensional change dramatically improves heat and mass transfer by reducing diffusion paths and increasing exposure to controlled environmental conditions, while the modular tray design allows for easy scaling through addition of more trays rather than increasing individual tray depth.
3Ease of operation
If intermittent agitation is used in rolling drum reactors, then mixing is improved, but temperature and humidity gradients increase
Solution Approach 1:
The agitation mechanism is extracted from the fermentation process itself. Instead of mechanically mixing the substrate, the system uses passive convection currents generated by controlled heating from below and cooling from above, along with periodic airflow. This eliminates the temperature and humidity gradients caused by mechanical agitation while maintaining adequate mixing through fluid dynamics.
Solution Approach 2:
The system uses pneumatic control of airflow and hydraulic principles of natural convection to achieve mixing without mechanical agitation. Controlled air injection and temperature-driven convection currents create fluid motion that distributes substrates and maintains homogeneous conditions, avoiding the gradient problems associated with mechanical rolling or stirring.
Data Source
AI summary
Fixed bed bioreactor with natural convection and forced draught to obtain bioactive substances by solid-state fermentation (SEF) using fungi macromycetes. This bioreactor may be from turn drum with pendulum motion and natural and forced convection to a tray bioreactor with natural convection. They are used in the production of bioactive substances as crude extracts of lignocellulosic enzymes and fungal polysaccharides obtained by using mixtures of lignocellulosic materials as substrates and macromycetes fungi as inoculum, controlling pH, humidity and particle size, inoculation rate and environmental conditions during fermentation such as temperature, relative humidity and carbon dioxide and oxygen concentration.