Colorants that enter the wastewater streams normally pass through a wastewater treatment plant where they are eliminated to a large degree by adsorption on sludge. The extent to which residual amounts reach the surface waters depends on the efficiency of treatment processes. Low concentrations of dyes in wastewater do not normally pose any significant environmental hazard. Environmental problems arise mainly from inefficient removal of dyes or disposing the untreated dye effluent to water receiving bodies. This is normally the case in most developing countries.
This article was originally published in the Textile Review magazine,May, 2013 issue, published by Saket Project Limited, Ahmedabad.
About the Author:
Prof. R. B. Chavan isassociated with the Institute of Tech. for Textile, Garment and Fashion Designat the University of Bahir Dar, Bahir Dar, Ethiopia.
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