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Bioreactor Controls-II01:18

Bioreactor Controls-II

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...

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A Method for Optical Quantification of Local Oxygen Limitations in Multiphase Bioreactors.

Ryan Rautenbach1, Katharina Zörner1, Jonas Barczyk2

  • 1Institute of Multiphase Flows, Hamburg University of Technology, Hamburg, Germany.

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Summary

This study introduces a novel optical method to visualize oxygen limitation in bioreactors. The technique maps oxygen supply, revealing spatial heterogeneities crucial for optimizing bioprocesses.

Keywords:
bioreactorsgas‐liquid systemsmethylene blueoxygen limitationredox chemistrystirred tank reactors

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Area of Science:

  • Biochemical Engineering
  • Chemical Engineering
  • Biotechnology

Background:

  • Spatial oxygen limitation causes physiological stress and metabolic heterogeneity in aerobic bioprocesses.
  • Oxygen availability in stirred tank reactors is non-uniform due to hydrodynamics and mass transfer.
  • Current methods for measuring local oxygen supply are often point-wise or intrusive.

Purpose of the Study:

  • To develop and validate a non-intrusive optical method for visualizing spatial oxygen limitation in gas-liquid stirred tank reactors.
  • To provide a continuous, two-dimensional map of local oxygen supply.
  • To identify oxygen-limiting regions and understand their relationship with hydrodynamics and mass transfer.

Main Methods:

  • Utilized the reversible redox chemistry of methylene blue in alkaline glucose solutions as an optical indicator.
  • Drove the system to a reduced, colorless state, then monitored spatial reoxidation during aeration.
  • Analyzed pixel-wise colorization time to generate 2D fields indicating local oxygen supply.

Main Results:

  • Established a robust reaction medium by assessing glucose and sodium hydroxide concentrations.
  • Observed characteristic spatial structures of oxygen-limiting regions at different impeller speeds.
  • Identified under-supplied zones at low agitation and transport limitations near walls at high agitation.

Conclusions:

  • The optical method provides a simple, cost-effective tool for visualizing oxygen supply heterogeneities.
  • The technique offers qualitative, physically meaningful insights into oxygen transport and mixing.
  • It supports the identification of limiting operating points and complements CFD analyses in bioreactors.