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Title
Reducing pollution in reactive cotton dyeing through wastewater recycling
Authors
ARMAND FLORIN BERTEA ROMEN BUTNARU and RAZVAN BERARIU
Received
February 28, 2012
Published
Volume 47 Issue 1-2 January-February
Keywords
discoloration, Fenton-like system, reactive dyeing and washing wastewater, water recycling
Abstract
The study tries to elucidate the feasibility of Fenton-like oxidation treatment as a water recycling process in cotton
fabrics preparation. Two commercial dyes, Reactive Blue 19 and Reactive Red 243, have been analysed. First, the
wastewater produced during dyeing (individual dyes and dye mixture) at different dye concentrations and the wash-off
wastewater have been decolorized. The effectiveness of the treatment was indicated by the colour removal degree, both
reactive dyes showing good discoloration during the oxidative process. Further on, the treated wastewater was reused,
either as such or mixed with fresh water (1:1), in preparation processes, namely cotton scouring and bleaching.
Scouring with discoloured wastewater led to high hydrophilicity, for both individual dyes and dye mixtures. It was
found out that dyeing and wash-off wastewater can be recycled only at low dye concentration, after discolouration and
mixing with fresh water, in a new bleaching process, without affecting the final quality of the fabric. It was concluded
that the studied Fenton-like process could be effective in recycling wastewater in cotton fabrics preparation.
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