REMOVAL OF DYE FROM WASTE WATER BY CATALYTIC WET PEROXIDE METHOD

Abstract

Reactive congo red dye from textile and dyeing industries pose grave environmental problem. The waste containing azo dyes is non-degradable. The process of dyeing is a combination of bleaching and coloring, which generates huge quantities of wastewaters causing environmental problems. The effluents from these industries consist of large quantities of sodium, chloride, sulphate, hardness, carcinogenic dye ingredients and total dissolved solids with very high BOD and COD values. Various methods have been used for dye removal like adsorption, coagulation, electrocoagulation, Fenton's reagent and combination of these processes. Though these treatment processes are efficient in dye removal, they generate adsorbed waste/sludge, etc. which further causes a secondary pollution. In wet oxidation the sludge is disposed off to a great extent by oxidizing the organic pollutant. Catalytic wet oxidation method (CWAO and CWPO) is gaining more popularity. CWPO process using F1207, in particular has advantages like better oxidation ability than using oxygen. Copper cerium oxide (CeCuO2) has been prepared by sol-gel method and characterized by XRD, FTIR, SEM/EDAX, BET surface area . The experimental studies have been carried out in a 0.5 L three necked glass reactor equipped with magnetic stirrer with heater and a mercury thermometer. The peroxide degradation of congo red dye on this material has been evaluated by examining catalyst loading, initial pH, hydrogen peroxide dosage, time and temperature have at atmospheric pressure. The cerium copper oxide prepared by sol-gel showed good performance for oxidation degradation of the congo red dye. The percent removal of dye at optimum pH 7, temperature 90°C using 2m1/L 1+07 solution and 2g/L catalyst is approx 96%. The percent removal of COD at optimum pH 5. temperature 90°C using 2m1 E1207/L solution and I g/L catalyst loading is approx 63%. The results showed that the prepared CeCuO2 (sol-gel) catalyst is more efficient for dye removal.