Various dyes present in water have adverse effect on human life, plants and on animals. There are various technologies used to effectively remove these dyes from effluent water.The methodology, advantages and disadvantages of various technologies are discussed in detail. Special emphasis is made on removal of azo dyes using biosorption method. Kinetic procedure of biosorption is also discussed in detail.

Different types of dyes and large number of metals are available in wastewater effluents. They cause unfriendly impact on human life, plants and creatures. Endeavors have been made through the present review to study distinctive sorts of biosorbents and their application to remove dyes and metal from watery arrangements through adsorption.