Bioreactor Mesh Bottom Immersion Dynamics
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Solution Overview
Problem
Conventional temporary immersion bioreactors for in vitro plant biomass production are limited to laboratory scale due to high energy demands and contamination risks, preventing the efficient production of differentiated plant biomass on a commercial scale.
Innovation Solution
A scalable temporary immersion bioreactor design featuring a growth chamber with a mesh bottom and a flexible bag, driven by a mechanism that allows controlled immersion and drainage, reducing energy consumption and minimizing contamination risks through a sealable port for medium and inoculum introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temporary immersion bioreactors are used for in vitro plant biomass production, then plant tissue quality is improved and hyperhydricity is reduced, but energy consumption increases and contamination risk increases, limiting scale to laboratory level only
Solution Approach 1:
The bioreactor employs a dynamic immersion system where the growth chamber is periodically lowered into and raised from the liquid medium. The driving mechanism creates oscillating motion that alternates between immersion (for nutrient uptake) and exposure to gaseous environment (for aeration and gas exchange), optimizing both tissue quality and energy efficiency
Solution Approach 2:
The system operates on periodic cycles of immersion and exposure. The growth chamber undergoes repeated cycles of being submerged in liquid medium for nutrient absorption followed by exposure to air for gas exchange. This periodic action maintains high plant tissue quality while reducing continuous energy input requirements compared to conventional systems
2Reliability
If conventional temporary immersion bioreactors are used for in vitro plant biomass production, then plant tissue quality is improved andhyperhydricity is reduced, but contamination risk increases, limiting scale to laboratory level only
Solution Approach 1:
The growth chamber is enclosed in a flexible bag that can be sealed to create a controlled environment. This flexible enclosure allows the chamber to be sealed during immersion, preventing contamination from the liquid medium, while still permitting gas exchange when needed. The sealable design maintains sterility without requiring complex rigid sealing mechanisms
Solution Approach 2:
The flexible bag acts as an intermediary barrier between the plant tissue in the growth chamber and the external environment. It allows selective interaction - permitting gas diffusion while preventing contamination from the liquid medium. This intermediary structure enables safe scaling by isolating the culture from contamination risks
3Productivity
If conventional temporary immersion bioreactors are used, then multiplication rates are high and nutrient uptake is improved, but device complexity and labor requirements increase
Solution Approach 1:
The bioreactor system is segmented into distinct functional components: an outer chamber for liquid medium, a flexible bag enclosing the growth chamber, and a driving mechanism for oscillation. This segmentation allows each component to perform its specific function efficiently while simplifying the overall system design and maintenance
Solution Approach 2:
The growth chamber design allows plant material to automatically receive nutrients and oxygen through the periodic immersion cycles without requiring complex pumping or aeration systems. The system uses the natural movement of the chamber itself to create the necessary fluid dynamics for nutrient uptake and gas exchange, reducing mechanical complexity
4Ease of operation
If the growth chamber is allowed to move freely in the outer chamber, then flexibility in positioning is improved, but uncontrolled movement causes energy loss and potential contamination
Solution Approach 1:
The system employs controlled dynamic movement rather than static positioning or completely free movement. The growth chamber is guided to move along a single vertical axis between immersion and exposure positions, providing the necessary positioning flexibility while preventing lateral movements that would waste energy and potentially cause contamination
Solution Approach 2:
The flexible bag acts as an intermediary constraint that allows vertical movement of the growth chamber while preventing uncontrolled lateral motion. It provides just enough guidance to maintain energy efficiency and prevent contamination while preserving the flexibility needed for the immersion-exposure cycle
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the production of differentiated plant biomass on a larger scale with reduced energy consumption and minimized contamination, facilitating higher yields and improved plant quality by optimizing nutrient uptake and aeration.
Implementation Method 1
temporary immersion of the growth chamber in the liquid medium
Implementation Method 2
mesh bottom defining a plurality of pores to receive plant material
Implementation Method 3
a driving mechanism arranged to selectively drive movement of the growth chamber along a single axis
Data Source
AI summary
A temporary immersion bioreactor (10) for in vitro production of differentiated plant biomass including a growth chamber (12) having one or more transparent side walls (14) and a mesh bottom (16), the mesh bottom (16) defining a plurality of pores (18) to receive plant material. The bioreactor (10) includes a flexible bag (20) formed from a transparent material, the flexible bag (20) having a sealable opening and being dimensioned to receive the growth chamber (12) together with a liquid medium (22). The bioreactor (10) also includes an outer chamber (24) having one or more transparent side walls (26). the outer chamber (24) is formed to correspond in shape to the growth chamber (12) and dimensioned to receive the growth chamber (12) within the flexible bag (20) so that the mesh bottom (16) of the growth chamber (12) faces a bottom (28) of the outer chamber (24) that in use is intended to rest on a support surface. Movement of the growth chamber (12) within the outer chamber (24) is restrained to movement along a single axis such that the mesh bottom (16) of the growth chamber (12) moves towards and away from the bottom (28) of the outer chamber (24).