Methane emissions from wastewater

Methane emissions contribute to about a third of global warming, however some of these emission sources are only just being understood. Every year, 3 billion tonnes of CO2e enters the atmosphere due to methane escaping from water.

Water utilities in particular must have a thorough understanding of their emissions if they are to achieve ambitious net zero carbon targets. Additionally, public and private resources need to be allocated to solutions that enable water utilities to mitigate their greenhouse gas emissions, including methane.

of global methane emissions are due to wastewater treatment. At Bluemethane, we specialise in identifying and capturing methane from water.



In many cases a methane estimate will miss the real extent of emissions. Bluemethane provides solutions to precisely measure and monitor dissolved methane, facilitating accurate reporting of emissions.


Methane recovery technology

Most gases are emitted through the degassing stage. Bluemethane technology consists of two stages, a degassing unit and a low vacuum system. 


Don’t guess your emissions.
Measure your emissions.

Having confidence in your dissolved methane data is vital for accurate reporting of emissions. This is why Bluemethane is offering a low-cost, continuous methane measuring service to ascertain cyclical methane emissions. Using this data, Bluemethane can determine the potential revenue that can be gained from mitigating these emissions, and asses the benefit in deploying recovery technology.

  • Best-in-Class Measurement, Reporting, and Verification

    Our methods have been validated via rigorous R&D and technical assessments at Cranfield University’s Water Science Institute.  

  • Build trust in your 2030 promise

    Our technology is currently being deployed at multiple municipal wastewater locations, to enable accurate reporting of methane emissions and delta to 2030 targets. 

  • Integrate into existing systems

    Bluemethane partners with industrial and municipal wastewater operators to measure methane in line with their existing systems. 

Decarbonise with confidence

Bluemethane’s solutions seamlessly plug into industrial and municipal wastewater infrastructure, delivering operational and financial benefits alongside long-term climate impact.

  • Capture carbon, stay energy positive

    Capture your first tonne of methane with no additional energy using existing wastewater processing assets. 

  • Plug in and decarbonise using existing infrastructure

    Reduce your scope one emissions with your existing infrastructure.

  • Your greatest emissions could be your decarbonising opportunity

    Biogenic methane emissions converted from water to energy present a billion tonnes carbon dioxide removal opportunity.

Further understanding 

Carbon dioxide has been well mapped. However, sources of methane are only starting to be fully understood. Below are some explanations to understand this area further.

Why is it important to measure the emissions at multiple points at WWTP?

Whether it is to know your emissions and report them or to understand how you can utilise the methane at different points, Bluemethane can scope these emissions in detail. 

What is our methodology for GHG measuring?

Our measurement system is based on UNESCO and IHA guidelines (2010). Our protocols are customisable. We formulate a sampling plan for each case based on the needs and site conditions. Our current approach includes high-resolution sampling and gas chromatography analysis in the laboratory. Finally, we obtain a mapping of methane and other gases if required, as well as seasonal variability. Our report contains the potential use of methane according to the results and recommendations.

How much energy can I generate from methane recovery?

There are very few points of methane emissions from the water line treatment of municipal sewage. The main sources of methane emissions is from anaerobic reactors, where methane is produced, but not always utilised.

For example, the Chemical Oxygen Demand (COD) in the feed to Upflow Anaerobic Sludge Blanket (UASB) varies between 2,000 and 10,000 mg/l. 2,000 mg/l as being the worst case. With an assumption that 70% of this is converted to methane – 1,400 mg/l of COD is converted to methane, which gives a total of 350 mg/l of methane produced. Thus about 8.5% of the methane produced is dissolved in the effluent. The dissolved methane in the effluent of a typical UASB will be than about 30 mg/l.

What are carbon offsets and can they be used for methane?

There is increasing evidence supporting the need to reduce methane emissions. President Biden has proposed the price per tonne of methane emissions to be $1,500 because “these emissions cause more warming, health impacts, and economic damage in the short term.”

We estimate the potential market for carbon offsets from reservoirs to be in excess of £20bn.

What is the benefit to my utility company by measuring methane from its WWTP?

At Bluemethane we start from the fact that a problem that is not well understood is a problem that will not be solved.  This underscores our initial objective: crafting a cost-effective yet high accurate measurement system for wastewater treatment. Once complete we are then able to  determine the decarbonisation and energy opportunity.

Can I get a free consultation ?

We would be happy to talk you through both the measurement approach and capture technology. Please email us. 

Subscribe to our newsletter to receive the latest innovation

Privacy Settings
We use cookies to enhance your experience while using our website. If you are using our Services via a browser you can restrict, block or remove cookies through your web browser settings. We also use content and scripts from third parties that may use tracking technologies. You can selectively provide your consent below to allow such third party embeds. For complete information about the cookies we use, data we collect and how we process them, please check our Privacy Policy
Consent to display content from - Youtube
Consent to display content from - Vimeo
Google Maps
Consent to display content from - Google
Consent to display content from - Spotify
Sound Cloud
Consent to display content from - Sound