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Abstract
The paper presents a method for reducing the amount of freshwater used in the textile industry, by using gamma irradiated textile wastewater for scouring and bleaching in the pretreatment process of knitted cotton fabric. The wastewater samples were irradiated by gamma radiation doses between 3-12 kGy that resulted in a reduced pH value of 9 to nearly neutral 7-7.5, and color reduction percentage of 57- 90%. Thus, the water becomes appropriate for replacing freshwater in the scouring-bleaching stage of cotton fabric. The performance of the cotton fabric samples were also evaluated after scouring & bleaching with irradiated wastewater and found similar to those samples processed with freshwater in respect of whiteness, absorbency and weight loss.
Highlights
The textile industries have great significance in terms of economic contribution as well as employment generation in Bangladesh
The paper presents a method for reducing the amount of freshwater used in the textile industry, by using gamma irradiated textile wastewater for scouring and bleaching in the pretreatment process of knitted cotton fabric
The water becomes appropriate for replacing freshwater in the scouring-bleaching stage of cotton fabric
Summary
A considerable amount (10-40 %) of unfixed hydrolyzed dyes remains in the wastewater, resulting in an intensely colored effluent discharges [5], which represents the main pollution source from the textile industry. This causes agonizing problems in Bangladesh, where the factories release their effluents directly into the rivers, canals and water streams, polluting the existing surface water sources, and depleting the ground water levels. Owing to a growing population, the dyeing companies must recover, recycle and reuse part of the water, or they face the shutdown threat [6] These factories experience the combined pressures of increasing water demand and wastewater treatment costs. The treatment and reuse of the wastewater resulted from the textile industry is a subject of great interest for research [7,8,9,10,11]
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