Wastewater originating from textile industries is a complex
mixture of potentially polluting substances which imposes serious
threat to the receiving environment. Normally, 1e15% of dyes used
in the process remains and is often found in the effluentwastewater
stream(Barka et al., 2009). Generally, colours are noticeable at a dye
concentration of 1 mg/l and an average concentration of 300 mg/l
has been reported in effluents from textile manufacturing processes
(O’Neill et al., 1999). The absorption of light due to such coloured
wastewater from industries creates problems to photosynthetic
aquatic plants and algae. Compared to wastewaters from other
industries, effluent from textile and dye manufacturing industries is
most difficult to treat mainly due to the presence of synthetic dyes of
complex aromatic chemical structure that render these compounds
highly stable and hence recalcitrant to degradation (Kaushik and
Malik, 2009). Wastewater decolourization can be, however, achieved
by chemical and physical methods including adsorption,
coagulation-flocculation, oxidation and electrochemical methods
(Lin and Peng, 1996).