Azo dyes are discharged in large quantities from the dye and textile industries as well as from the pulp and paper industry. Zollinger (1987), Robinson et al. (2001) and Ogugbue et al. (2011) reported that over 7×105 ton of dye-stuff is produced and consumed annually all over the world. Due to their chemical structure, dyes are resistant to fading on exposure to light, water and many chemicals (Poots and McKay, 1976; McKay, 1979). Many dyes are difficult to decolourise due to their complex structure and synthetic origin reported that 10-15% dyes are released into the environment during dyeing process generating highly colored effluents. Colour in wastewater makes it aesthetically displeasing and the darkness of colour inhibits penetration of light deeper into the water interfering with the life-processes of aquatic plants and animals. These colouring materials are often toxic and hazardous, carcinogenic or mutagenic to life forms because dyes can remain in the environment for a long period of time and therefore, adequate treatment procedure becomes necessary. Biodegradation is generally a well-accepted and economical technique for industrial wastewater. However, some of the organic pollutants like dye and pesticides are no biodegradable. Sometimes they are carcinogenic and mutagenic. Azo-dyes and organophosphate pesticides are such type of organic pollutants. As described in the literature, there are different processes available for wastewater treatment.