Degradation of azo dyes using hydrodynamic cavitation and external oxidants

Document Type : Research Paper


1 BVCOE, Mumbai

2 Department Of Chemical Engineering, AISSMS College Of Engineering, Pune

3 Department of Chemical Engineering, Madan Mohan Malaviya University of Technology, Deoria Road, Gorakhpur, UP 273010, India

4 Post-doctoral Research

5 Department of Chemical Engineering, AISSMS College of Engineering


Hydrodynamic cavitation (HC) with an orifice as the cavitating device was used to study the degradation of methyl orange dye. The operating parameters of the process, such as pH and inlet pressure, were optimized. The effect of hydroxyl radical promoters like Fenton oxidation and hydrogen peroxide (H2O2) on the extent of degradation was also investigated. It has been observed that acidic conditions (pH 2) favor the degradation of methyl orange. The combined effect of hydrodynamic cavitation with hydrogen peroxide was investigated at the solution’s natural pH and an optimized solution pH 2. Maximum degradation of 99.2% was observed at natural pH, whereas complete degradation of methyl orange dye was observed at pH 2 with 8 ml/L of hydrogen peroxide addition. The hybrid process of HC/Fenton and HC/H2O2 showed the highest efficiency for the degradation of methyl orange with a minimum energy requirement (0.11 kWh) and operational cost (USD $ 0.0062/L).


Main Subjects

Articles in Press, Accepted Manuscript
Available Online from 13 February 2024
  • Receive Date: 19 July 2023
  • Revise Date: 13 February 2024
  • Accept Date: 13 February 2024