Home Por qué se deben medir las emisiones de N2O
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Por qué se deben medir las emisiones de N2O

El óxido nitroso (N2O) se genera durante el tratamiento de las aguas residuales y se libera a la atmósfera a través de desorción por aireación. El N2O se forma cuando las condiciones del proceso para la conversión del nitrógeno no son las ideales.

Dado que el potencial de calentamiento global del N2O es 273 veces superior al del CO2, los estudios revelan que puede suponer hasta el 90 % de la huella de carbono de una estación de aguas residuales. La estimación únicamente a través de factores de emisión pasa por alto las variaciones estacionales y específicas del emplazamiento, lo que conduce a informes de sostenibilidad imprecisos.

La medición de N2O en tiempo real permite a los operadores evaluar con precisión las emisiones directas y optimizar sus procesos para reducir el impacto medioambiental.

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Cómo funciona el sistema de N2O en aguas residuales

El sistema de N2O en aguas residuales incluye un controlador y 1-2 sensores con cables de 5-100 metros de longitud.

El sensor mide el óxido nitroso (N2O) disuelto en tiempo real en las aguas residuales, lo que proporciona datos en línea continuos para detectar tendencias y correlaciones con otros parámetros. Permite estrategias avanzadas de control de procesos.

La instalación es sencilla, con un mantenimiento mínimo: calibrar el sensor cada dos meses y sustituir el cabezal del sensor dos veces al año.

Los datos se almacenan en el controlador y pueden transmitirse al sistema de control de la estación depuradora para calcular las emisiones.

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Tech Notes
References
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Tech Notes References
Positioning of N2O Sensors in Typical Biological Wastewater Treatment Processes

Two liquid phase N2O sensors accurately represent process dynamics and emissions in most common raceway and recirculation reactors.

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Tech Notes References
Nitrous Oxide Data Directly from Sensor to Sustainability Report

Learn how Kerteminde Forsyning applied nitrous oxide data to reduce the formation of N2O while maintaining low nitrogen emissions

N2O Sensor
Tech Notes References
N2O sensor matches 91% of measured off-gas emissions

Case Study: Full-scale comparison of N2O emissions determined by liquid sensors and off-gas measurement

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Tech Notes References
Direct Effect of Activated Sludge Concentration on N2O Emission and CO2-equivalents at Full-scale

Significant 3-fold increase in IPCC2019 wastewater N2O emission factor supported by Danish studies.

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Tech Notes References
Positioning of the N2O Wastewater Sensor

A case study from Kralingseveer WWTP in the Netherlands explores the influence of sensor placement.

N2O mechanisms
Tech Notes
National N2O Mapping and Reduction of N2O Emission through Advanced Online Control

Based on data from Danish WWTPs through advanced online-control.

Figure 1: Activated Sludge Tank
Tech Notes References
N2O Monitoring Highlights Potential for GHG Emissions Reduction

Learn about the results from N2O monitoring in the activated sludge tanks at Severn Trent’s Spernal sewage treatment plant

Denitrification
Tech Notes
A Tool for Carbon Dosage Control

Monitor the N2O concentration in the liquid and use N2O as a control parameter for carbon dosage in the denitrification process.

N2O Sensor Controls Emissions from Deammonification Processes
Tech Notes References
N2O Sensor Controls Emissions from Deammonification Processes

Learn how the water utility Aquafin controls emissions from deammonification processes using the the N2O Wastewater Sensor

Nitrous Oxide Measurement
Tech Notes
Nitrous Oxide Measurement as Key Step towards Climate-Neutral Wastewater Treatment

Greenhouse gas emissions at wastewater treatment plants are coming into focus as the water industry works to reduce its climate footprint

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References
Identifying N2O at the Flensburg wastewater treatment plant

The investment costs had initially deterred us somewhat. However ...

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Tech Notes
Characterizing N2O emissions from WWTPs

A study of three very different WWTPs in Denmark: Bjergmarken (125,000 PE), Holbæk (60,000 PE), and Hvalsø (11,570 PE)

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Tech Notes
N2O Emissions from Danish WWTPs – a two year monitoring project

The available data show that the nitrous oxide emission varies in time and between wastewater treatment plants.

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Nitrous Oxide Emissions from Trickling Filters

Information regarding N2O emissions from trickling filters is limited, partly caused by the difficulties in capturing off-gases.

IPCC-2019-report
Tech Notes
IPCC Greenhouse Gas Emission Factors

Significant 3-fold increase in IPCC2019 wastewater N2O emission factor supported by Danish studies.