Off-gas Measurement

Nitrous oxide emissions dominate the greenhouse gas balance of wastewater treatment plants. Their high variability requires robust, high-resolution measurement technology for continuous monitoring.

Diverse Benefits

Measuring various gas species in the process off-gas of wastewater treatment plants – highly variable in space and time – provides new, in-depth insights into the dynamics and optimization of biological processes.

Greenhouse Gas Emission Measurement

Process off-gas from wastewater treatment plants contains greenhouse gases in significant quantities – their precise measurement is the most important basis for accounting and reduction.

CH4
N2O
CO2

Energy Optimization

Oxygen transfer measurement enables the assessment and optimization of the aeration system – thereby reducing energy consumption.

O2

Increasing Nitrogen Removal

The combined analysis of oxygen transfer, nitrous oxide emissions and other gases reveals potential for improved utilization of existing infrastructure. Proper optimization can significantly increase nitrogen removal.

O2
CO2
N2O

Process Control

Measuring process off-gas in biological processes offers great potential for process control. Low maintenance effort and multiplexing make cost-effective control possible.

N2O
O2
CO2

Off-gas monitoring system

The Right Package for You

Every optimization requires a specific measurement concept. We develop the right measurement project for your requirements.

Aeration Check

1 month

Ideal for assessing the aeration equipment and optimizing it. This package enables substantial energy savings.

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Annual Campaign

12 months

Ideal for accounting greenhouse gas emissions, optimizing oxygen transfer, and identifying greenhouse gas reduction potential.

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Permanent Installation

unlimited

Ideal for the sustainable optimization of the wastewater treatment plant in terms of greenhouse gas emissions, nitrogen removal, and energy consumption.

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Notos Measurement System

The flexible off-gas measurement system from upwater. Adaptable to any plant size.

Numerous Gas Species 

N2O, CH4, CO2, O2, NOx

Spatially High-Resolution 

1 - 14 measurement points

Temporally High-Resolution

40 s per measurement point 

High-Frequency Online Monitoring

Gas Flow Control

Proven at Over 30 Wastewater Treatment Plants

50 measurement years

Very Low Maintenance Effort

Fully Automated

Notos Hood+Flow

Notos Box

Notos Box Analyzer

Fully automated high-end gas analyzer delivers precise readings at low maintenance costs. The Notos Box can be modularly adapted to your requirements.

Notos Box S

up to 2 channels

The ideal device for small wastewater treatment plants or special applications.

Notos Box M

up to 4 channels

The best choice for comparing multiple wastewater treatment lines.

Notos L

up to 7 channels

The most popular choice: it covers almost all requirements regarding spatial resolution.

Notos Box XL

up to 14 channels

This configuration offers maximum spatial coverage – with correspondingly reduced temporal resolution.

Notos Box L

Notos Box XL

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Notos Hood + Flow

The Notos Hoods are easy to install and can be placed at a large distance (<500 m) from the central measurement system. The modular air flow measurement Notos Flow enables a tailored measurement concept. 

Notos Flow: Modular Air Flow Measurement

Depending on the aeration system, Notos Flow can measure the local air flow rate for emission determination.

Light (15 kg) and Stackable

Notos Hood is light, robust and durable. Its stackability and low weight simplify transport and storage.

Mountable on Any Plant

Upwater has developed and tested various mounting options. We will find the right solution.

Low Dead Volume

The low volume and low height of Notos Hood are designed for fast response times in sampling.

Notos Hood

The low volume and low height of Notos Hood are designed for fast response times in sampling.

Air Flow Measurement Notos Flow

Air flow determination is one of the largest sources of uncertainty in emission measurement. Notos Flow enables precise recording of air volume flows as a basis for reliable emission determination. Notos Flow is particularly helpful for collector aeration systems, reducing uncertainties in air flow determination.

Notos Hood and Flow

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