Remediation of dyes in textile effluent: a critical review on current treatment technologies with a proposed alternative

The control of water pollution has become of increasing importance in recen t years. The release of dyes into the environment constitutes only a small proportion of water pollution, but dyes are visible in small quantities due to their brilliance. Tightening government legislation is forcing textile industries to treat their waste effluent to an increasingly high standard. Currently, removal of dyes from effluents is by physio-chemical means. Such methods are often very costly and although the dyes are removed, accumulat ion of concentrated sludge creates a disposal problem. There is a need to f ind alternative treatments that are effective in removing dyes from large v olumes of effluents and are low in cost, such as biological or combination systems. This article reviews the current available technologies and sugges ts an effective, cheaper alternative for dye removal and decolourisation ap plicable on large scale. (C) 2001 Elsevier Science Ltd. All rights reserved .