Reuse of Spent Dye Bath in Cotton and Viscose Dyeing

Abstract

The aim of this work was to find a suitable dyeing process so that expensive reactive dyes could be reused without dehydration. Bleached cotton, viscose fabrics were dyed with four different ways. It was found that the two-stage, two-bath reactive dyeing method, in which the discharge process and the fixing process are separated, is the most suitable for reusing the dye bath. Reusing reactive dyes after another bath process is especially suitable for higher color depths (4% and above). This process not only makes the best use of expensive reactive dyes, but also produces very little water pollution due to the low amount of dye in the wastewater. The process is therefore economical as well as environmentally friendly.