Laura Ulloa Guntiñas defended her doctorate thesis “Towards Circular Economy in the management of spent acids: metals recovery using chelating resins”, developed in the Chemical & Biomolecular Engineering Department of the University of Cantabria, under the supervision on Dr. María Fresnedo San Román and Dr. Eugenio Bringas. The academic event took place on December 11th, 2020 through Microsoft Teams application. The evaluation committee was formed by Prof. Inmaculada Ortiz (University of Cantabria), Dr. Montserrat García (Politechnic University of Valencia) and Dr. María Antonia Pérez (University of Murcia).