Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 19
Articles | Volume 19, issue 19
https://doi.org/10.5194/amt-19-6311-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-6311-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 19
Research article
 | 
05 Oct 2026
Research article |  | 05 Oct 2026

On-line analysis of N2O isotopic composition during biological nitrogen removal in wastewater treatment to disentangle production and reduction processes

Hannes Keck, Laurence Strubbe, Paul M. Magyar, Adriano Joss, Andreas Froemelt, André Kupferschmid, Klaus-Holger Knorr, and Joachim Mohn

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Latest update: 05 Oct 2026
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Short summary
We monitored nitrous oxide in a pilot wastewater treatment plant in real time to understand how microbes produce and remove this greenhouse gas. We designed and tested a laser-based analytical setup, with which we were able to show that denitrification is the main source of nitrous oxide emissions and that low oxygen concentrations enhances nitrous oxide removal. Our approach offers a new way to monitor the wastewater treatment processes and to cut climate-relevant nitrous oxide emissions.
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