TREATMENT OF TEXTILE DYEING BATHS BY PHOTO-FENTON PROCESSES AND EVALUATION OF THE REUSE POTENTIALITY

TREATMENT OF TEXTILE DYEING BATHS BY PHOTO-FENTON PROCESSES AND EVALUATION OF THE REUSE POTENTIALITY. In this work the treatment of textile dyeing baths by a sequential reductive-oxidative process was evaluated, aiming its utilization in new dyeing process. The results demonstrated that reactive dyes can be easily degraded by reductive processes mediated by zero-valent iron, a fact that induces decolorizations of about 80%. Sequential photo-Fenton processes permit almost total removal of the residual color with elimination of 90% of the COD content. The reuse of treated residues permits the achievement of materials that attend practically all textile specifications, with exception of the color difference parameter (Delta E), which is unsatisfactory toward the importation standards, but adequate for the national market.