Reduction of COD of Textile Industry Waste Water by Using Acoustic Cavitation Coupled with Advanced Oxidation Processes

The textile and dye industries require ahuge amount of water for processing and produce a large volume of wastewater.Generated wastewater had potential hazards and a threat to the aquatic life.In the present study, reduction of chemical oxygen demand (COD) of textile industry waste water has been carried out using acoustic cavitation, acoustic cavitation + H 2 O 2 , acoustic cavitation + Fenton process and acoustic cavitation + Photo Fenton process.The process parameters such as sonication power, duty cycle, solution pH, loading of H 2 O 2 and loading of FeSO 4 .7H 2 O were investigated in detail to evaluate their effects on the reduction of COD of textile industry waste water.Effective optimum conditions were found to be 800W of sonication power, 60 % duty cycle, pH of 3, loading of H 2 O 2 , 75 µl/Land loading of FeSO 4 .7 H 2 O, 65 mg/L.The results showed that the percentage of COD reduction of textile industry waste water was maximumfor Acoustic cavitation + Photo Fenton process as compared to Acoustic cavitation + Fenton process, acoustic cavitation + H 2 O 2 and the conventional processes.It was also observed that percentage of COD reduction of textile industry waste water was more effective in acoustic cavitation based combined techniques as compared to individual process.