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Related Experiment Videos

High nitrite concentration accelerates nitrite oxidising organism's death.

Bing Liu1, Mitsuharu Terashima1, Nguyen Truong Quan2

  • 1Faculty of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino Wakamatsu, Kitakyushu, Japan

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|August 2, 2018
PubMed
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High nitrite concentrations inhibit nitrifier growth, while very high levels cause cell death (poisoning). Understanding this difference is crucial for optimizing biological wastewater treatment processes.

Area of Science:

  • Environmental microbiology
  • Wastewater treatment engineering
  • Biochemical kinetics

Background:

  • High nitrite concentrations are known to inhibit biological nitrite oxidation to nitrate.
  • Traditional models describe this as Monod-type non-competitive inhibition, reducing biomass growth.
  • However, extremely high nitrite levels can be toxic to nitrifying microorganisms.

Purpose of the Study:

  • To differentiate between nitrite-induced growth inhibition and direct poisoning of nitrifiers.
  • To quantify the threshold for nitrite poisoning in activated sludge systems.
  • To develop a kinetic model for biological nitrite oxidation under varying nitrite conditions.

Main Methods:

  • Batch experiments were conducted on nitrite oxidiser-enriched activated sludge.

Related Experiment Videos

  • Cell counting, biomass chemical oxygen demand (COD), and oxygen uptake rate were measured.
  • Various nitrite concentrations were tested at pH 7.0.

    • Main Results:

    • Nitrite poisoning, characterized by decay in measurable parameters, occurred above 100-500 mgN/L nitrite.
    • Biomass growth inhibition was observed at lower nitrite concentrations.
    • A modified IWA ASM1 kinetic model was developed based on these responses.

    Conclusions:

    • A clear distinction exists between nitrite growth inhibition and poisoning.
    • The developed kinetic model can predict nitrite oxidiser washout in side-stream partial nitritation reactors.
    • This research aids in optimizing nitrogen removal in wastewater treatment.