Pedro Díaz defended his doctral thesis “New process for the biotechnological production of lactic acid: Integration on membranes filtration technologies”, developed in the Chemical & Biomolecular Engineering Department under the supervision of Prof. Raquel Ibáñez and Dr. Jose Antonio Otero. The academic event took place on July 30th, 2019 at 12:00h in the ETSIIT of the University of Cantabria and the evaluation committed was formed by Prof. Antonio Hernández Giménez (University of Valladolid), Dr. María Fresnedo San Román San Emeterio (University of Cantabria) and Dr. Ana Rodríguez González (Instituto de Productos Lácteos de Asturias, IPLA-CSIC).