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Faster through training: The anammox case.

T Lotti1, R Kleerebezem1, J M Abelleira-Pereira2

  • 1Department of Biotechnology, Delft University of Technology, 2628 BC, Delft, The Netherlands.

Water Research
|June 16, 2015
PubMed
Summary
This summary is machine-generated.

Anaerobic ammonium oxidation (anammox) bacteria can grow faster than previously thought. A new selection method significantly increased anammox bacteria growth rates, improving nitrogen removal efficiency in wastewater treatment.

Keywords:
AnammoxElectron transfer rateGrowth rateMBRMaximum specific uptake rateSelection strategySpecific activity

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Area of Science:

  • Environmental Microbiology
  • Wastewater Treatment Engineering
  • Biotechnology

Background:

  • Anaerobic ammonium oxidizing (anammox) bacteria are crucial for nitrogen removal in wastewater.
  • Current applications are limited to warm wastewater with high ammonium loads.
  • The perceived low growth rate of anammox bacteria restricts process efficiency.

Purpose of the Study:

  • To investigate methods for increasing the maximum specific growth rate (μmax) of anammox bacteria.
  • To overcome limitations in wastewater treatment processes reliant on anammox bacteria.
  • To enhance the efficiency of nitrogen removal technologies.

Main Methods:

  • Application of a novel selection strategy in a membrane bioreactor.
  • Focus on maximizing the electron transfer capacity of the microbial community.
  • Monitoring microbial community composition and growth rates.

Main Results:

  • Achieved a maximum specific growth rate (μmax) of 0.33 d⁻¹, four times higher than previously reported.
  • The microbial community remained dominated by bacteria closely related to Candidatus Brocadia sp.40.
  • Demonstrated significant adaptation of anammox bacteria growth rates to altered cultivation conditions.

Conclusions:

  • Anammox bacteria possess a remarkable capacity for growth rate adaptation.
  • Novel selection strategies can substantially enhance anammox bacteria performance.
  • This research opens avenues for more efficient and broader application of anammox processes in wastewater treatment.