A. Iborra-Clar

Reuse of wastewater of the textile industry after its treatment with a combination of physico-chemical treatment and membrane technologies

This work is focused on the treatment of a textile plant wastewater. The industry mainly manufactures socks, stockings and panties, and the water is treated in order to be reused. The wastewater was characterized and jar-tests experiments were carried out with different coagulants and flocculants, at different concentrations and pH in order to obtain clarified water that can be treated by means of ultrafiltration (UF) or nanofiltration (NF). The combination of the physico-chemical treatment and the nanofiltration leads to a COD removal of almost 100%.

Combination of physico-chemical treatment and nanofiltration to reuse wastewater of a printing, dyeing and finishing textile industry

Abstract The main goal of this work was to study the feasibility of the combination of physico-chemical treatment with nanofiltration to reuse wastewater of a printing, dyeing and finishing textile industry. For the physico-chemical treatment two coagulants (one containing Al3+ and another containing Fe2+) were compared by carrying out jar-tests using different chemical concentrations and pH values. After that, nanofltration experiments with physico-chemically treated wastewater were performed at different operating pressures and cross-flow velocities. The results showed that the COD and conductivity of the nanofiltration permeates were lower than 100 mg/L and 1000 μS/cm respectively.

Comparison between nanofiltration and ozonation of biologically treated textile wastewater for its reuse in the industry

This work is focused on the advanced treatment of the biologically treated wastewater of a textile plant. Nowadays the factory effluent is treated by an activated sludge process carried out after the wastewater neutralization. The wastewater treatment plant effluent is not still appropriate for its reuse because of the residual COD and conductivity. Both nanofiltration experiments at different operating conditions and oxidation reactions with ozone and ozone/UV irradiation were performed to evaluate the final water quality for its reuse.

Autoevaluación y co-evaluación continua del trabajo individual y grupal en una asignatura experimental.

Este trabajo se basa en la evaluacion de la competencia basica “trabajo en grupo” con el fin de obtener una evaluacion que refleje el trabajo de cada alumno dentro de su grupo en una asignatura experimental. Para ello, el alumno participa en un proceso de evaluacion tanto individual (autoevaluacion) como del resto de companeros del grupo (co-evaluacion). Cada evaluacion contempla la valoracion cualitativa del funcionamiento de los miembros del grupo y la valoracion cuantitativa del trabajo academico realizado en funcion del grado de participacion. La evaluacion del funcionamiento del grupo se realiza a traves de encuestas anonimas basandose en los modelos de A. Garcia-Carbonell y F. Watts. En ellas, cada alumno realiza una evaluacion de cada uno de sus miembros y de el mismo en dos momentos diferentes del semestre: inicial y final. En la valoracion cuantitativa, los alumnos distribuyen la nota obtenida en el trabajo academico segun los criterios de P. Morales-Vallejo. Paralelamente los profesores realizan la valoracion de los trabajos academicos realizados y la efectividad del trabajo en grupo a traves de ‘rubricas de evaluacion’. Con estas metodologias de evaluacion se pretende detectar a los alumnos que no contribuyen a la efectividad del grupo, de forma que la nota de los trabajos academicos dependa del grado de participacion de cada alumno. En definitiva, obtener una evaluacion individual mas justa en una asignatura completamente experimental, donde el trabajo en grupo es clave.