Large-Scale Bioreactor Chamber Layout for High-Density Cell Culture
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Solution Overview
Problem
Current bioreactor systems are limited in size and cell-sustaining capacity, particularly for high-density non-bacterial cell cultures, with most supporting volumes of less than 50 million cells per milliliter.
Innovation Solution
The development of large-scale bioreactor systems with internal reaction chambers ranging from 125,000 L to 315,000 L, featuring a liquid depth to vessel diameter ratio of 1.5-3, incorporating heat transfer systems, low shear impellers, and automated control systems to maintain optimal conditions for high cell densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bioreactor volume is increased to support high-density non-bacterial cell cultures, then cell-sustaining capacity is improved, but mixing efficiency and temperature control deteriorate
Solution Approach 1:
The bioreactor employs multiple impellers divided into different zones (top, middle, bottom) with varying blade configurations and speeds. This segmentation allows each zone to perform specific mixing functions, maintaining effective mixing throughout the large 125,000-315,000 L volume without requiring a single overly complex agitation system.
Solution Approach 2:
The system uses variable speed control for different impellers, allowing dynamic adjustment of mixing intensity in different regions. The impellers can rotate at different speeds to optimize mixing efficiency at various depths, addressing the challenge of maintaining uniform mixing in the large-volume reactor.
2Quantity of substance
If bioreactor volume is increased to support high-density non-bacterial cell cultures, then cell-sustaining capacity is improved, but temperature control deteriorates
Solution Approach 1:
The temperature control system is divided into multiple heating/cooling zones corresponding to different regions of the bioreactor. Each zone can be independently controlled to maintain optimal temperature throughout the large volume, preventing temperature gradients that would occur in a uniformly controlled system.
Solution Approach 2:
The system uses a heat transfer fluid circulating through jackets and coils as an intermediary to transfer heat throughout the large bioreactor volume. This indirect heat transfer method enables precise temperature control in the 125,000-315,000 L volume without direct contact heating/cooling mechanisms.
3Quantity of substance
If bioreactor volume is increased to support high-density non-bacterial cell cultures, then cell-sustaining capacity is improved, but oxygen transfer efficiency deteriorates
Solution Approach 1:
The sparger system is designed with varying pore sizes and distributions in different regions of the bioreactor bottom. This local variation optimizes gas bubble formation and distribution specifically in zones where oxygen transfer is most critical, maintaining high oxygen transfer efficiency despite the large overall volume.
Solution Approach 2:
The system introduces gas not only from the bottom but also through side-wall spargers, adding a spatial dimension to oxygen transfer. This multi-dimensional gas introduction strategy ensures adequate oxygen supply throughout the large volume without relying solely on bottom sparging, which would be insufficient at this scale.
4Quantity of substance
If bioreactor volume is increased to support high-density non-bacterial cell cultures, then cell-sustaining capacity is improved, but system complexity increases
Solution Approach 1:
The control system integrates multiple functions (mixing control, temperature control, pH control, oxygen transfer management) into a single automated platform that can manage all parameters simultaneously. This universal control approach reduces operational complexity despite the multiple subsystems required for the large-volume bioreactor.
Solution Approach 2:
The system incorporates automated monitoring and adjustment mechanisms that self-regulate process parameters based on sensor feedback. This self-service capability reduces the need for manual intervention and simplifies operation of the complex 125,000-315,000 L system, allowing it to maintain optimal conditions automatically.
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
The solution enables the support of high-density cell cultures up to 100 million cells per milliliter, ensuring efficient mixing, temperature control, and sterility, while allowing for scalable and automated operation.
Implementation Method 1
a heat transfer system at least partially surrounding at least one area of the internal reaction chamber and being configured to maintain the reaction mixture in said area at a pre-selected temperature
Implementation Method 2
an agitator for mixing said reaction mixture, the agitator comprising multiple low shear impellers
Implementation Method 3
at least one sparger fluidly connected to a fluidic channel through which at least one component of the reaction mixture is introduced into the reaction mixture through the bottom section of the internal reaction chamber
Data Source
AI summary
This disclosure relates to large-scale bioreactor systems comprising a vessel comprising internal reaction chamber having a volumetric and cell-sustaining capacity significantly above that of currently available bioreactor systems.