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Título:	Sustainable dyeing of denim using indigo dye recovered with polyvinylidene difluoride ultrafiltration membranes
Autor/a:	Buscio Olivera, Valentina; Crespi Rosell, Martin; Gutiérrez Bouzán, María Carmen
Otros autores:	Universitat Politècnica de Catalunya. Institut d'Investigació Tèxtil i Cooperació Industrial de Terrassa; Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera; Universitat Politècnica de Catalunya. ENMA - Enginyeria del Medi Ambient
Abstract:	Indigo is one of the most consumed dyes in the textile sector, as it is widely used for the dyeing of denim clothes. About 15% of indigo used in the dyeing process is discharged to the wastewater treatment plants or sometimes into rivers, in countries where regulations are not strictly applied. In this work, real effluents that contained indigo dye were treated by means of 4 different ultrafiltration membranes. The feasibility to recover the concentrated dye with lab and semi-industrial pilots was also investigated. The studied membranes achieved up to 99% colour removal and 80% chemical oxygen demand (COD) decrease. Finally, the concentrates containing 20 g L_1 of indigo dye were reused in new dyeing processes. Colour differences (DECMC) and rubbing and washing fastnesses were evaluated. Fabrics dyed with the recovered indigo concentrates exhibited similar characteristics than the ones obtained with the commercial dye
Materia(s):	-Àrees temàtiques de la UPC::Enginyeria tèxtil ::Impacte ambiental -Àrees temàtiques de la UPC::Enginyeria tèxtil ::Fabricació tèxtil::Tintura -Dyes and dyeing--Textile fibers -Dyes and dyeing--Textile fibers--Environmental aspects -Indigo -Membrane technology -Ultrafiltration -Dye recovery -Indigo -Reuse -Membrane technology -Ultrafiltration -Tints i tenyit -- Aspectes ambientals -Tints i tenyit -- Fibres tèxtils -Membranes (Tecnologia) -Ultrafiltració
Derechos:	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Tipo de documento:	Artículo - Versión presentada Artículo
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