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Wastewater treatment processes are known to emit direct greenhouse gas (GHG) emissions, mainly carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O). Direct CO₂ emissions are emitted in the biological oxidation of organic matter and considered biogenic, however CH₄ and N₂O are strong GHGs contributing to the climate impact of wastewater treatment plants (WWTPs). 

As many countries and municipalities have set carbon neutrality goals, it is important to cut the GHG emissions from WWTPs. However, the emissions have been shown to vary significantly between different treatment plants and processes. Thus, on-site monitoring at WWTPs is needed to estimate the emission level accurately and find the root causes of the emissions. 

In the CIS-Fin project, two long-term GHG monitoring campaigns will be carried out at two full-scale WWTPs in Finland. The monitoring data will be utilized in process model development to be used as a tool for estimating the emission level and testing mitigation strategies without the need for heavy on-site measurements.

Long-term GHG emission monitoring

Funding and collaborative partners

The CIS-Fin project is funded by . CIS-Fin is a joint project between Aalto University and University of Oulu. Whereas Aalto University researches the GHG emissions from centralized wastewater treatment in the project, . The long-term GHG emission monitoring at centralized WWTPs is carried out at Kakolanmäki WWTP operated by in Turku, Finland, and Paroinen WWTP operated by in Hämeenlinna, Finland.