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Related Experiment Video

Updated: Jan 31, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

Denitrification as an N₂O sink.

Monica Conthe¹, Pawel Lycus², Magnus Ø Arntzen²

¹Department of Biotechnology, Delft University of Technology, Delft, the Netherlands.

|January 8, 2019

Summary

Wastewater treatment can reduce nitrous oxide (N₂O) emissions by enhancing N₂O reductase activity. Studies show denitrification capacity often exceeds N₂O production, suggesting a natural N₂O sink.

Keywords:

Activated sludge Denitrification Nitrous oxide Wastewater treatment

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Last Updated: Jan 31, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

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Published on: December 6, 2018

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The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

Published on: August 3, 2016

Area of Science:

Environmental Microbiology
Wastewater Treatment Engineering
Greenhouse Gas Mitigation

Background:

Nitrous oxide (N₂O) is a potent greenhouse gas emitted from wastewater treatment.
N₂O is produced during nitrification and denitrification processes.
N₂O reductase (NOS) activity is key to reducing N₂O emissions.

Purpose of the Study:

To investigate the N₂O reducing capacity relative to N₂O production capacity in activated sludge.
To determine factors influencing the N₂O sink potential of denitrification.
To explore the mechanisms behind N₂O overcapacity in microbial communities.

Main Methods:

Incubation experiments with activated sludge from a wastewater treatment plant.
Measurement of N₂O production and reduction rates.
Quantitative PCR (qPCR) and metaproteomics to assess microbial gene and protein abundance.
Addition of carbon substrates to evaluate their impact on N₂O reduction.

Main Results:

The N₂O reducing capacity (V_maxN2O→N2) consistently exceeded N₂O producing capacity (V_maxNO3→N2O) by a factor of 2-5.
Adding carbon substrates increased denitrification rates but did not significantly alter the N₂O reduction overcapacity ratio (α).
Gene and protein data suggest in-cell electron competition may be more critical than gene/protein abundance ratios for N₂O reduction.

Conclusions:

Denitrification in wastewater treatment systems possesses an inherent overcapacity for N₂O reduction, acting as a potential N₂O sink.
Enhancing NOS activity is a viable strategy for mitigating N₂O emissions.
Further research is needed to elucidate the precise mechanisms, such as electron competition, governing N₂O reduction efficiency.