Reuso de soluções de corantes básicos, pós-tratamento fotoeletroquímico, para tingimentos de fibras acrílicas
The increasing contamination of natural water resources is gaining public attention and has roused environmental concern in the society. As the second richest country in water resources, Brazil has an abundant supply of water, but it lacks a good management plan for these resources. It is estimated that by 2025, the industry will be responsible for 24% of the world consumption of water. The development ofalternative proposals / solutions that focus on water conservation and reuse, as well as improvements of fiber characteristics that result in processes with less consume ofdyes and auxiliaries is of critical importance for the textile industry. In the present work the potential of the reuse of aqueous basic dye solutions for dyeing knitted fabrics of acrylic fibers was evaluated after the treatment by an photoelectrochemical process for color removal. The photoelectrochemical treatment resulted in the removal of more than 99% of the color of solutions of the basic dyes Blue Astrazon FGGL 300%, Red Astrazon GTLN 200% and Yellow Gold Astrazon GL 200% and more than 90% of the organic load was mineralized. At a laboratory scale also effluents were produced from bichromic dyeing of acrylic fabrics. The residual dyeing baths were subjected to a photoelectrochemical treatment and reused in a second dyeing process. In the reutilization study the dyeing bath exhaustion was above 80% on all conditions used in this study. Differences in colour intensity (K/S) between standarddyeings with distilled water and dyeings with treated water and residual colour differences (DE) were unsatisfactory. The obtained DE values above 2.0 were beyond the acceptable limits between 0.3 and 1.1 established in the textile industry.In bichromic dyeing studies the substitution of 10 to 30% of the treated water by distilled water resulted in DE values between 1.86 and 0.3, showing a reduction in color difference down to the acceptable limits
Advisor:Patricio Guillermo Peralta Zamora; Marco Tadeu Grassi; Antônio Carlos de Souza; Ivonete Oliveira Barcellos
School:Universidade Regional de Blumenau
Source Type:Master's Thesis
reuse of treated waster water.
Date of Publication:11/30/2006