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Related Experiment Videos

Improved process control with a pHauxostat for application in biotechnology.

G H de Villiers1

  • 1Water Utilisation Division, Department of Chemical Engineering, University of Pretoria, Pretoria, 0001, South Africa.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|December 20, 2003
PubMed
Summary

The pHauxostat, a self-regulating biotechnology control technique, was analyzed and categorized. This study develops a theoretical model using alkalinity, enabling predictable and wider applications for pH control.

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Area of Science:

  • Biotechnology
  • Process Control
  • Biochemical Engineering

Background:

  • The pHauxostat is a control technique proposed decades ago with limited current application.
  • Existing applications of the pHauxostat are not widely utilized.
  • A need exists for a theoretical framework to enable broader pHauxostat implementation.

Purpose of the Study:

  • To analyze and categorize pHauxostat control techniques.
  • To develop a theoretical model for pHauxostat operation.
  • To enable predictable and expanded applications of the pHauxostat.

Main Methods:

  • Categorization of pHauxostats into Category A (A1, A2) and Category B (B1, B2).
  • Development of a mathematical model using alkalinity as a key parameter.

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  • Definition and determination of an alkalinity yield coefficient via half reactions.
  • Integration with traditional biological growth models for theoretical description.

    • Main Results:

    • Successful categorization of pHauxostats into distinct classes.
    • Establishment of a theoretical model for pHauxostat operation based on alkalinity.
    • Quantification of the alkalinity yield coefficient.
    • Demonstration of the technique's self-regulating nature in biotechnology.

    Conclusions:

    • The developed theoretical model provides a framework for understanding and applying pHauxostats.
    • The alkalinity yield coefficient is crucial for modeling and predicting pHauxostat performance.
    • This research facilitates predictable and controlled use, potentially increasing pHauxostat adoption in biotechnology.
    • The pHauxostat functions as a self-regulating system for pH control using feed manipulation.