期刊
JOURNAL OF CLEANER PRODUCTION
卷 91, 期 -, 页码 201-207出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2014.12.016
关键词
Dye recovery; Indigo; Reuse; Membrane technology; Ultrafiltration
资金
- Spanish Ministry of Economy and Competitiveness [CTM2012-31461]
- UPC
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. (C) 2014 Elsevier Ltd. All rights reserved.
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