CATALYTIC WET AIR OXIDATION OF DYE INDUSTRY WASTE WATER USING METALLIC CATALYST

Phenol and COD is a major pollutant found in wastewater streams generating from dye industries. The presence of excess phenol makes the wastewater unsuitable for conventional biological treatment. The treatment of dye industry wastewater by catalytic wet air oxidation (CWAO) at low operating conditions (80-90°C temperature and 2-4 bar total air pressures) was studied in a batch reactor. For the study there were different four types of catalyst used. In study the efficiency of the all four catalyst for phenol removal and COD removal were examined and compared by CWAO process. Among the all catalyst Cu-Fe-AC (20% wt.) catalyst exhibited the best performance with approx. 81% phenol removal at 80°C temperature, 2 bar total air pressures and 90 minutes run time. ZnO catalyst supported on activated carbon showed good capability of removing COD up to 54% at same condition and 90 minutes run time.