Dr. María José Martín de Vidales Calvo, Associate Professor of the Chemical Engineering Degree, at the School of Industrial Engineering and Design of the Polytechnic University of Madrid, and belonging to the research group of Analysis and Optical Characterization of Materials, is currently developing a research internship in the PAS research group at the Chemical & Biomolecular Engineering Department of the University of Cantabria (UC). This stay, from June 1 to July 31, 2021, is performed in the frame of the grants for short stays of researchers from other institutions at the UC and it is focus on the wastewater treatment through several advanced oxidation processes of high scientific and industrial interest.