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Bioreactor Controls-I01:28

Bioreactor Controls-I

Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly monitored using...
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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
Bioreactor Controls-III01:22

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Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
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Updated: Jul 4, 2026

Light-Controlled Fermentations for Microbial Chemical and Protein Production
08:37

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Published on: March 22, 2022

An integrated microprocessor-based fermenter control system.

R D Merrill1, K Bauer

  • 1Electronics Engineering Department, Lawrence Livermore National Laboratory, University of California, PO Box 5504, Livermore, California 94550, USA.

Biotechnology and Bioengineering
|April 1, 1986
PubMed
Summary

A microprocessor-based fermenter controller was developed for optimizing fermentation processes. This reliable system facilitates scale-up and cost-effective operation for in-house needs.

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Area of Science:

  • Biotechnology and biochemical engineering
  • Process control systems

Background:

  • Industrial fermentation requires precise control of multiple parameters.
  • Existing control systems may lack flexibility and scalability.
  • Development of integrated, microprocessor-based systems offers enhanced capabilities.

Purpose of the Study:

  • To design and construct a microprocessor-based fermenter controller.
  • To achieve flexibility, high performance, and cost-effectiveness for in-house systems.
  • To facilitate process scale-up and on-line optimization experiments.

Main Methods:

  • Integrated microprocessor-based controller design.
  • Implementation of feedback control for temperature, agitation, dissolved oxygen, pH, and foam.
  • Integration with a laboratory minicomputer for data acquisition and analysis.

Main Results:

  • The controller accurately manages key fermentation parameters without manual intervention.
  • Optimized feedback control ensures high performance under varying metabolic conditions.
  • The system reliably monitors, displays, and records fermentation data.

Conclusions:

  • The developed fermenter controller successfully met design goals for scale-up, flexibility, and cost-effectiveness.
  • The system demonstrated high reliability and performance over four years of operation.
  • This integrated controller is suitable for optimizing diverse fermentation processes.