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Nutrient Regulation by Continuous Feeding for Large-scale Expansion of Mammalian Cells in Spheroids

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Liquid level control in an aerated continous-flow fermentor.

K W Anderson¹, E Grulke, P Gerhardt

¹Department of Chemical Engineering, Michigan State University, East Lansing, Michigan 48824.

Biotechnology and Bioengineering

|June 1, 1985

Summary

A new electronic liquid level control system ensures consistent fermentor volumes during continuous culture. This automated system precisely manages fluid withdrawal, maintaining stable conditions for bacterial growth.

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Area of Science:

Biotechnology
Chemical Engineering
Process Control

Background:

Maintaining stable working volumes is critical for optimizing continuous fermentation processes.
Traditional methods for volume control can be imprecise, leading to process variability.
Automated control systems are needed for reliable and efficient continuous culture.

Purpose of the Study:

To develop and evaluate an electronic liquid level control system for continuous-flow fermentors.
To ensure precise maintenance of working volume during fermentation.
To assess the system's applicability across different fermentor types and scales.

Main Methods:

An admittance sensor was integrated into the fermentor.
An external transmitter and controller regulated a recycle pump.
The system controlled the rate of spent medium withdrawal via microfiltration.

Main Results:

The electronic control system maintained liquid levels within +/- 1% during bacterial culture.
The system consistently kept levels within +/- 5% under all tested conditions.
The developed system demonstrated high precision and reliability.

Conclusions:

The electronic liquid level control system effectively maintains constant working volume in continuous fermentors.
The system offers a reliable solution for process stability in bioprocessing.
The control system is adaptable for various continuous-flow fermentation applications.