A Pilot-scale Investigation for Simultaneous Reuse and Decolourization of Textile Wastewater Using Ozone

Irfan Ahmed shaikh
The first patented textile dyeing machine having an Ozone injection system 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 wastewater as well as on fabric surface. Several different dyings were carried out in the machine using variety of reactive dyes. At the completion of dying 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 decolourization effectiveness of liquor was considered as an indicative of colour removal from the dyed fabric because fabric was being rinsed simultaneously during oxidative decolourization treatment. Fabric samples rinsed with both conventional and ozone based methods were evaluated for fastness properties, change of shade, fabric appearance, and colour fading. On the whole, the results suggested that the application of O3 during textile washing process resulted into reduced water consumption and lowered processing time without deteriorating colourand fastness properties.
Ozone; Wash-off; Reactive dyes; Jet Dyeing Machine; Fastness
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