The OZONE4WATER project – Cutting-Edge Ozone-Technology for Water Treatment (in Portuguese, Tecnologia de Ponta de Ozono para Tratamento de Água) is a R&D project funded by the Fundação para a Ciência e a Tecnologia (FCT), Portugal, within the framework of the 2020 Call for SR&TD Project Grants (reference PTDC/EAM-AMB/4702/2020). It involves four Portuguese entities: (1) the principal contractor – Faculty of Engineering of University of Porto (FEUP) through LSRE-LCM – Laboratory of Separation and Reaction Engineering – Laboratory of Catalysis and Materials (LSRE-LCM), a part of the consortium of ALiCE – Associate Laboratory in Chemical Engineering, (2) AdP VALOR – Serviços Ambientais, S.A., a company from the Águas de Portugal group, (3) Enkrott, Gestão e Tratamento de Águas, S.A., and (4) Simbiente – Engenharia e Gestão Ambiental, Lda.