In the project, a pilot plant containing an adsorption guard, blower, and reactor with the catalyst was tested at three Danish WWTPs - on two mainstream off-gas streams and two sidestream deammonification off-gas streams.
The project shows good results for catalytic treatment of N2O, but the economic feasibility of the technology has to be assessed at a case-by-case level and seems to demand high emissions of N2O. Modelling efforts with a digital twin approach showed good results in predicting N2O emissions.