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Related Experiment Videos

Nitrous Oxide Production in a Granule-based Partial Nitritation Reactor: A Model-based Evaluation.

Lai Peng1,2, Jing Sun1, Yiwen Liu3

  • 1State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P.R. China.

Scientific Reports
|April 4, 2017
PubMed
Summary

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Nitrous oxide (N2O) emissions from sustainable wastewater treatment using granule-based nitrogen removal are quantified. A model reveals oxygen and granule size significantly impact N2O production, linked to ammonia oxidation rates.

Area of Science:

  • Environmental Science
  • Environmental Engineering
  • Biotechnology

Background:

  • Sustainable wastewater treatment is crucial for environmental protection.
  • Energy-efficient granule-based autotrophic nitrogen removal processes are gaining traction.
  • Nitrous oxide (N2O) production, a potent greenhouse gas (GHG), during these processes is not well understood.

Purpose of the Study:

  • To apply and evaluate a two-pathway N2O model for granule-based partial nitritation (PN) reactors.
  • To gain insights into N2O distribution within granules.
  • To understand the factors influencing N2O production pathways.

Main Methods:

  • Utilized a previously established N2O model incorporating AOB denitrification and hydroxylamine oxidation pathways.

Related Experiment Videos

  • Simulated N2O production in a granule-based PN reactor.
  • Validated model predictions against N2O monitoring and isotopic measurement data.

    • Main Results:

    • The model accurately predicted N2O dynamics and revealed shifts in N2O production pathways within granules.
    • Increased oxygen concentration and granule size significantly enhanced N2O production.
    • A strong linear relationship (R² = 0.99) was found between N2O production and ammonia oxidation rate (AOR).

    Conclusions:

    • The developed model effectively predicts N2O emissions from granule-based PN reactors.
    • Oxygen concentration and granule size indirectly influence N2O production by altering AOR.
    • This study provides critical insights for mitigating GHG emissions in advanced wastewater treatment.