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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.

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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.

The performance of Mung Pod Shell activated carbon (MPSAC) for the adsorption of Zn 2+ ,Cu 2+ ,Pb 2+ Fe 2+ , and Cr 3+ ions was studied through batch technique. MPSAC were prepared by carbonization followed by activation. Mung Pod Shells were activated with 2N H2SO4 and 10% KOH solution at 100°C. The optimum adsorption conditions were specified as a function of contact time, initial metal ion concentration and pH. Langmuir and Freundlich isotherms were observed to fit the equilibrium data and the model parameters were calculated using linearized equations. The adsorption capacities were 13.32 mg/g (Zn 2+ ), 18.80 mg/g (Cu 2+ ), 19.68 mg/g (Pb 2+ ), 37.29 mg/g (Fe 2+ ) and 20.72mg/g (Cr 3+ ). The results showed that MPSAC is an economically feasible and environment friendly material for removal of Zn 2+ ,Cu 2+ , Pb 2+ , Fe 2+ and Cr 3+ from industrial effluents.