Sanitation

Reduction of N₂O emissions in wastewater treatment plants

Reduce the climate impact of your wastewater treatment plants with a solution dedicated to managing nitrous oxide (N₂O), a greenhouse gas 300 times more potent than CO₂.

Purecontrol's intelligent control system combines energy efficiency with reduced GHG emissions.

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Ventilation control to limit N₂O emissions

Our module finely adjusts aeration cycles to limit nitrous oxide (N₂O) emissions:

Continuous estimation of N₂O emission risk
Dynamic aeration control
Joint consideration of energy and climate issues
Real-time monitoring of direct and indirect emissions from the site

Objective:
Reducing nitrous oxide emissions while maintaining optimal operation of wastewater treatment plants.

Nitrous oxide: the leading source of emissions in WWTP

Nitrous oxide emitted from aeration tanks is the main source of emissions from wastewater treatment facilities. Nearly 300 times more potent than CO₂, this greenhouse gas is the priority for reduction by water companies aiming for “net zero emissions.”

80% of WWTP emissions are due to N₂O (up to)

Reduction of greenhouse gas emissions

The Purecontrol N₂O module acts directly on the main source of climate impact in wastewater treatment plants: nitrous oxide emissions.

Already proven in several wastewater treatment plants, Purecontrol's predictive and real-time adjusted control of aeration cycles significantly reduces N₂O emissions.

-50% measured N2O emissions (up to)

Balance between performance and climate

The number one challenge for operators is balancing quality, energy savings, and environmental impact.
The solution simultaneously addresses the issues of discharge quality, nitrous oxide emission reduction, and energy consumption.
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The result: a control system that minimizes direct emissions without compromising quality or operating costs.

Multi-criteria management: energy, waste, and GHG emissions
Découvrir l’étude de cas
The first emission factor from a sanitation service is nitrous oxide produced in the aeration basins of treatment plants. It is therefore essential to act and for this, the breakthrough technology proposed by Purecontrol and Cobalt Water Global seems to us to be the only solution in line with our ambitions.
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Boris Gueguen

Sanitation Director

Nitrous oxide: incorporating emissions into regulation

The N₂O module is based on advanced modeling of nitrous oxide emissions, constructed from operating data. It can be supplemented by an on-site N₂O measurement campaign. This modeling allows for continuous assessment of emission risk based on operating conditions.
Risk is integrated in real time into the aerator control strategy, alongside energy and quality objectives. The algorithm adjusts settings minute by minute to reduce N₂O emissions without compromising performance.
Reduction du protoxyde d'azote solution step

From hypervision to control-command

Simplify day-to-day operations with real-time monitoring and control

Digital twin
PureConnect
PureAnalytics Energy
PurePilot
Modeling of N₂O
PureAnalytics Flow rates
Integration of external factors
Virtual sensor
Predictive view
Modeling of variables of interest to simulate and optimize ventilation scenarios based on forecast data.
Hypervision platform offering real-time monitoring, customizable graphs, tailored KPIs, and alerts for multi-site supervision.
Real-time analysis of power without sub-meters, proactive anomaly detection, and calculation of equipment consumption profiles.
Real-time control of PLCs, applying optimized instructions from the digital twin (control-command).
Modeling of N₂O emissions and scenarios for optimizing operation/emissions generated.
Prediction of incoming volumes at +10 hours to anticipate the treatment load.
Taking into account electricity rates (peak/off-peak hours), weather forecasts, and the carbon intensity of electricity. Use of an API with the specialist company Cobalt Water Global.
Modeling of a virtual NH4 probe based on the probes available on site (dissolved O2 and/or RedOx) for fine control of aeration cycles.
Prediction of changes in the Nh4 load and aeration settings at +24H
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In Rennes, France's first wastewater treatment plant designed to reduce N₂O emissions

Rennes Métropole and Purecontrol have deployed France's first real-time control system aimed at reducing nitrous oxide (N₂O) emissions, the main contributor to greenhouse gases in the sector.

Reduction in nitrous oxide emissions
Energy efficiency gains
Prospects for larger-scale deployment for more sustainable sanitation.
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Rennes metropole fait appel à Purecontrol pour optimiser le traitement des eaux usées