Hydrodynamic Cavitation for Degradation of Auramine O Dye Solution by Vortex Diode

Hydrodynamic cavitation for the degradation of model dye wastewater containing Auramine O dye was investigated using vortex diode as a cavitating device. The effect of different operating parameters such as inlet pressure, initial dye concentration and flow rate on degradation rate of auramine O was studied in the concentration range of 80 mg/L to 1200 mg/L. The cavitational yield of the cavitating device was obtained on the basis of COD reduction and color (based on absorbance). The results indicate that the COD reduction efficiencies were significantly affected by the physical operating conditions, indicating possibilities of enhancing COD removal efficiencies by optimization of operating parameters. Substantial enhancement was demonstrated in the degradation of dye solution using hydrodynamic cavitation. The superior performance of cavitating device in the form of vortex diode can be seen as a viable alternative for conventional cavitational reactors.