As a scholarship holder I want to thank the support from the Agencia Española de Cooperación Internacional y Desarrollo del Ministerio de Asuntos Exteriores (MAE – AECID), because it gives me the opportunity to study in the Departament d’Enginyeria Química of the Universitat Politècnica de Catalunya (UPC). I also want to thank to the Grup de Tècniques de Separació i Tractament de Residus Industrials (SETRI) of the UPC, especially to Professor Adriana Farran for her guidance throughout this work. My entirely gratitude to Professor Jose Luis Cortina and Professor César Valderrama who let me know how to develop this experimental work. Also to my colleagues, I really appreciate all the experiences we share in the laboratory during these months. Thanks to my family, Carmen, Pedro, Vanessa and Cristian for they support. Also I want to thanks the most to Galo, who is part of this project.