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Related Concept Videos

2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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The Equilibrium Constant03:10

The Equilibrium Constant

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Consider the oxidation of sulfur dioxide:
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Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
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Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Microbes and Climate Change01:27

Microbes and Climate Change

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Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

1.9K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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Related Experiment Video

Updated: May 6, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Nitrous oxide emissions from waste water.

W Debruyn1, G Lissens, J van Rensbergen

  • 1Energy division, VITO, Boeretang 200, B-2400 MOL, Belgium.

Environmental Monitoring and Assessment
|November 12, 2013
PubMed
Summary

Sewage systems are a significant source of nitrous oxide (N2O) emissions. This study measured N2O from wastewater, identifying microbiological denitrification as the cause and proposing emission factors.

Area of Science:

  • Environmental Science
  • Microbiology
  • Environmental Engineering

Background:

  • Nitrous oxide (N2O) emission estimations face uncertainty due to unknown emission factors and sources.
  • Sewage systems, a byproduct of human activities, represent a significant but understudied source of N2O emissions.

Purpose of the Study:

  • To investigate and quantify nitrous oxide (N2O) emissions from wastewater.
  • To identify the sources and mechanisms of N2O production within sewage systems.
  • To establish tentative emission factors for wastewater N2O based on experimental data.

Main Methods:

  • Conducted an experimental measurement campaign on wastewater samples from various sewage treatment plants.
  • Monitored nitrous oxide (N2O) development from water samples using gas chromatography.

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  • Analyzed concentration/time curves to understand N2O formation dynamics.

    • Main Results:

    • Confirmed that nitrous oxide (N2O) formation in wastewater originates from microbiological denitrification.
    • Quantified N2O production across different wastewater matrices.
    • Deduced tentative emission factors for the studied wastewater types.

    Conclusions:

    • Wastewater treatment systems contribute to atmospheric nitrous oxide (N2O) levels.
    • Microbiological denitrification is the primary driver of N2O production in these systems.
    • The study provides crucial data for refining N2O emission inventories and mitigation strategies.