Miguel Rodrı́guez

Comparison of different advanced oxidation processes for phenol degradation.

Advanced Oxidation Processes (O3, O3/H2O2, UV, UV/O3, UV/H2O2, O3/UV/H2O2, Fe2+ /H2O2 and photocatalysis) for degradation of phenol in aqueous solution have been studied in earlier works. In this paper, a comparison of these techniques is undertaken: pH influence, kinetic constants, stoichiometric coefficient and optimum oxidant/pollutant ratio. Of the tested processes, Fenton reagent was found to the fastest one for phenol degradation. However, lower costs were obtained with ozonation. In the ozone combinations, the best results were achieved with single ozonation. As for the UV processes, UV/H2O2 showed the highest degradation rate.

Photo-Fenton treatment of a biorecalcitrant wastewater generated in textile activities: biodegradability of the photo-treated solution

Photo-Fenton process was explored as photochemical pre-treatment to improve the biodegradability of a wastewater coming from a textile industry located in the south of France, which was characterized as very biorecalcitrant by means of Zahn–Wellens biodegradability test. The effect of H2O2, Fe(III) and temperature on the photo-mineralization processes have been studied and the optimal conditions were found. Experiments were made to obtain information concerning the evolution of the biodegradability of the treated effluent after 40 and 70% of photo-mineralization. The photo-treated effluent is not biocompatible and its complete mineralization cannot be performed by biological means. UV–VIS and high-performance liquid chromatography (HPLC) analyses show that aromatic intermediates remain in the effluent after the photo-treatment, which have been identified as the principal reason of the biorecalcitrance.

Influence of H2O2 and Fe(III) in the photodegradation of nitrobenzene

Abstract The influence of H 2 O 2 and Fe(III) in the degradation of nitrobenzene in aqueous solutions combined with UV radiation has been studied. A major efficiency is achieved when UV is combined with H 2 O 2 or Fe(III). Likewise, H 2 O 2 and Fe(III) concentration has an important effect on the degradation. Nitrophenol isomers are detected as the major intermediate products.

Justicia y sociedad en la Cataluña de los Austrias: magistrados y linajes nobiliarios

This article tries to establish the main features of the judicial system in Catalonia during the XVIth and XVIIth centuries. It represents a serious attempt of including the main items which affected the everyday life of Catalan jurists before the arrival of the Nova Planta Decree. Till now we have studied more or less each item but we needed to put all these data together. A difficult task which has been carried out, for the first time, in this study. Their social origins, professional experience and cultural incidence in the Catalan society are perhaps the main features of this article. Reshaping our knowledge is never easy but it casts new light on aspects which have been studied before without this general outlook.

APRENDIENDO A LEER COMPRENSIVAMENTE CON EL ORDENADOR. 2. EL ORDENADOR EN EL TRABAJO POR ÁREAS CURRICULARES: ENSEÑANZA POR DESCUBRIMIENTO*

RESUMEN El presente trabajo recoge el proyecto de investigacion efectuado durante el curso 1985–1986 en la escuela de Educacion Especial Xamfra por un grupo de estudiantes del Departamento de Psicologia de la Educacion de la UAB, dirigido por el doctor C. Monereo, sobre el desarrollo de la capacidad heuristica y el aprendizaje de las habilidades cognitivas asociadas a ella, a traves de la planificacion y aplicacion de secuencias algoritmicas, es decir de procedimientos o programas efectuados con instrucciones en lenguaje LOGO, que eran sistematicamente verificados en un ordenador situado dentro del aula. La experiencia se realizo con un grupo-clase de alumnos del centro, todos ellos con un handicap intelectual, mediante el trabajo en equipos y dentro de la propia aula, estableciendo cuatro areas de distinto ambito tematico —«areas curriculares»— en las que se trabajaban diferentes bloques de habilidades cognitivas, siendo el area del ordenador un centro mas de interes, en la que se obtenia el feed-back necesario para corregir los errores del programa elaborado o darlo por concluido.