The MULTISOURCE project (GA 101003527), in which ICRA researchers such as Joaquim Comas, Gianluigi Buttiglieri, Josep Pueyo, Sara Rodríguez-Mozaz, Esther Mendoza, Massimiliano Riva, and Eric Herran participate, has been funded under the European H2020 program with a total budget of €7.9M.

The main objective of MULTISOURCE is to demonstrate and optimize various enhanced natural treatment solutions (ENTS) in collaboration with local, national, and international stakeholders. Additionally, the project aims to develop innovative tools, methods, and business models that facilitate large-scale planning and long-term management of nature-based solutions (NBS) for water treatment, storage, and reuse in urban environments.

The project includes seven pilot plants for treating different types of urban water in locations across Europe and beyond, including Spain, Norway, France, Belgium, Germany, and Italy, as well as Brazil, Vietnam, and the United States. This global approach will generate knowledge, develop business models, and create modular tools that support sustainable water planning in different regions, promoting circularity and the widespread adoption of nature-based solutions for water treatment.

ICRA leads the development and validation of the Technology Selection and Design Tool (Nat4Wat), a web-based platform designed as a decision-support tool to help key stakeholders select and design NBS solutions tailored to their needs. Additionally, the institute coordinates the Girona pilot, in collaboration with the Girona City Council, where an innovative modular green wall for greywater treatment will be implemented and tested. This system will first be installed on the ICRA building and later at the Àgora School in the Sant Narcís neighborhood, where the treated water will be reused to irrigate a community garden for edible crops.

MULTISOURCE started in June 2021 and will conclude in June 2025. In March 2025, Girona will host the final project meeting, organized by ICRA and the Girona City Council, and with the attendance and participation of all project partners.