Speaker
Description
The world’s first patented dyeing machine was developed to treat wastewater liquor coming from the reactive dyeing process. Controlled quantities of ozone gas were injected in the machine during the washing process to decolourize dyes present in waster as well as on fabric surface. Several different dyeings were carried out in the machine using variety of reactive dyes. At the completion of dyeing process, washings were carried out using ozone in the jet dyeing machine, and the process was continued until the wastewater is decolorized around 90-100%. The colour removal efficiency of liquor was considered as an indicative of removal of unfixed dyed on the fabric because fabric was being washed-off continuously in the same liquor. Fabrics washed-off with both methods were compared in terms of colour fastness, change in shade, colour fading, and fabric appearance. Overall results indicated that the use of O3 during washing process resulted into reduced water consumption and lowered processing time without deteriorating colour and fastness properties.
