Abstract

ULSON DE SOUZA, A.A. et al. Color reduction in textile effluents by membranes. Lat. Am. appl. res. [online]. 2009, vol.39, n.1, pp.47-52. ISSN 0327-0793.

In this study, the efficiency of polymeric membranes in terms of reductions in color and chemical oxygen demand (COD) in textile industry effluents was investigated. Effluents containing different mixtures of dyes, taken from different processing stages, and some pure dyes in aqueous solution were used. Five membranes were used, three commercial ones produced by Osmonics (two nanofiltration M1 and NF-HL and one reverse osmosis SG) and two ultrafiltration (UF) membranes prepared in the laboratory using PES (polyethersulfone) named T1 and T2. Each membrane, due to its particular chemical nature and molecular weight cut-off (MWCO), had distinct values for permeate flux, and color, conductivity and COD reductions. After stabilization, the permeate flux varied from 20 to 71 L/h/m² and the dye retention from 81 to 100%. For aqueous solutions containing pure dyes, the permeate flux varied from 57 to 119 L/h/m², depending on the temperature used in the process. Membrane M1 showed a good performance; when considering the values for permeate flux (66 L/h/m²) and color reduction (99.3%).

Keywords : Textile Effluent; Dye; Polymeric membrane.

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