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Quantification, Viability Assessment, and Visualization Strategies for Acinetobacter Biofilms
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Phosphate uptake kinetics by Acinetobacter isolates.

A S Pauli1, S Kaitala

  • 1Water and Environment Research Institute, FIN-00101 Helsinki, Finland. anneli.pauli@aka.fi

Biotechnology and Bioengineering
|February 5, 1997
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Summary
This summary is machine-generated.

Acinetobacter bacteria efficiently uptake excess phosphate via the overplus phenomenon and luxury uptake, modeled by Michaelis-Menten kinetics. These findings are crucial for optimizing wastewater treatment processes.

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Area of Science:

  • Environmental Microbiology
  • Biotechnology
  • Wastewater Treatment

Background:

  • Polyphosphate accumulating bacteria play a vital role in nutrient removal in wastewater treatment.
  • Understanding phosphate uptake mechanisms is key to enhancing biological nutrient removal processes.

Purpose of the Study:

  • To investigate excess phosphate uptake (overplus phenomenon) and luxury phosphate uptake during growth in Acinetobacter isolates.
  • To model these uptake processes using kinetic parameters.

Main Methods:

  • Utilized Acinetobacter isolates from forest industry activated sludge as model organisms.
  • Applied the Michaelis-Menten model to quantify phosphate uptake rates and half-saturation constants.
  • Observed and analyzed polyphosphate granule formation during rapid uptake.

Main Results:

  • The overplus phenomenon followed Michaelis-Menten kinetics with a maximum initial phosphate uptake rate of 29 mg P g(-1) DM h(-1).
  • Growth-associated luxury phosphate uptake also followed Michaelis-Menten kinetics, with rates ranging from 3.7-12 mg P g(-1) DM h(-1).
  • No significant growth occurred during the rapid overplus uptake, though polyphosphate granules were prevalent.

Conclusions:

  • Acinetobacter isolates demonstrate significant capacity for both rapid, non-growth-associated phosphate uptake and growth-associated luxury uptake.
  • The Michaelis-Menten model effectively describes these distinct phosphate accumulation strategies.
  • These findings provide valuable insights for optimizing biological phosphorus removal in wastewater treatment systems.