Currently, nitrogen (N) removal in wastewater treatment plants (WWTP) accounts for 20% of their energy consumption. The NIMBI process will help to reduce this energy consumption and the associated carbon footprint, mainly related to the aeration used for the oxidation of organic matter and the nitrogen load. Furthermore, the cell will allow the methane enrichment of the biogas stream obtained from anaerobic digestion. Finally, an ammonium-rich stream will be generated that can be valorised in the form of fertilizer, promoting a new line of business for the sector and increasing the circularity of the water market.

As part of the project, a pilot plant will be designed and built to validate the NIMBI technology, which will be installed for 12 months at a WWTP operated by ACCIONA.