Abstract
Simple and sustainable reuse and recycle strategies were investigated with the intention of assessing ways to curb water consumption in the textile wet processing. Textile pre-treatment involves desizing, scouring and bleaching processes. Each process requires a plethora of chemicals along with water, out of which the unexhausted chemicals are drained in the effluent stream. Conventionally, 7.3 % alkali and 6.9 % hydrogen peroxide are utilised in the scouring and bleaching process. Attempts were made to reutilise the unexhausted 92.7 % alkali and 93.1 % hydrogen peroxide from the scouring and bleaching process. After recycling the scouring and bleaching process bath three times, effluent still contained 55 % alkali and 67.5 % hydrogen peroxide which was reused to desize a new grey fabric. The fabric properties like Tegewa rating, absorbency and whiteness were found to be better than the conventional enzyme desized fabric. The desized fabrics were then subjected to dyeing using reactive dyes Yellow HE6G and Navy Blue HER, where analogous dyeing and fastness properties were obtained when compared with fresh water samples. Economical feasibility has been calculated considering a production of 1 ton of fabric/day. It was observed that 83 % water and 74 % energy were conserved per ton of processed fabric which contributes to a saving of around 1 lac INR/ton.
Highlights
The emergence of industrialisation and urbanisation aggravates the situation of increasing demand for water
The Indian textile industry consumes 200–300 m3 of water per ton of the processed textiles generating a huge quantum of wastewater (Dasgupta et al 2015; Ranganathan et al 2007)
Many different strategies are employed for wastewater treatment such as use of high-energy gamma radiation to degrade the combined textile wastewater for its reuse in wet processing (Rahman Bhuiyan et al 2016)
Summary
The emergence of industrialisation and urbanisation aggravates the situation of increasing demand for water. The Indian textile industry consumes 200–300 m3 of water per ton of the processed textiles generating a huge quantum of wastewater (Dasgupta et al 2015; Ranganathan et al 2007). Erdumlu et al (2012) have mentioned that the effluent obtained from different finishing processes may be reused by partial purification. Membrane systems is the latest methodology for the treatment-recycling scheme to recover the chemicals and water (Fersi et al 2005; ElDefrawy and Shaalan 2007; Ranganathan et al 2007; Lu et al 2010). They have introduced a method of reusing water just after basic treatments like
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