REMOVAL OF COD & COLOUR FROM DISTILLERY WASTE WATER USING LOW COST ADSORBENTS

Abstract

Now a day's waste management has become the most crucial problem through the world. Industries like petrochemical, paint, diary, coal, sugar industry, pulp and paper unit, fermentation industry and coalmines are the common examples of environment sensitive industries. Waste discharged by these industries can be the cause of serious environment problem. To minimize the risk, it is necessary to treat or manage such waste with an effective methodology. Distillery unit is also one of most environmental sensitive industry. The distillery effluent is known as spent wash which is a dark brown color waste water. Spent wash is one of the most complex organic industrial effluent and has extremely high COD and BOD values. Present investigation deals with the utilization of modified (acid activated) coconut coir, modified wooden powder and modified bagasse, a sugar industry waste, and activated as low cost adsorbents for the removal of color and COD of distillery waste water. Batch study was conducted to evaluate the adsorption capacity and effects of various parameter (pH, Adsorbent dose, contact time etc) on adsorption. The effective pH0 was 7.0 for adsorption on coconut coir and bagasse, while for adsorption on wooden powder effective pHo was 4.2. kinetic study shows that the adsorption of color and COD on all the adsorbents was, a gradual procss,' . Equilibrium reached in about 4 h contact time. Optimum Coconut Coir, Wooden Powder and Bagasse dosages were found to be 25, 20 and 1 g 1-1, respectively. The adsorption followed pseudo second-order kinetics. Equilibrium adsorption data on Coconut Coir, Wooden Powder and Bagasse were analyzed by Freundlich, Langmuir isotherm. Linear analysis showed that the Langmuir isotherm best-fits the equilibrium data for adsorptive removal of COD by Coconut Coir, Wooden Powder and Bagasse.