Combined Hydrodynamic Cavitation-based Processes as an Efficient Treatment Approach for Real Textile Industrial Wastewater

Abstract

As industrialization and globalization have advanced in recent years, an expanding volume of textile dye effluent and pharmaceutical wastewater has been discharged into the environment. Hydrodynamic cavitation (HC) and its combination with other advanced processes such as hydrogen peroxide (H2O2), were studied in this work for the removal of textile dye effluent from aqueous media. The effect of different molar ratio of H2O2 dose was examined. The experimental tests were carried out at pH_ value= 2 and input pressure p_in=4.5 bar, with a mix of three types of textile wastewater sampled at different treatment times. The concentration of H2O2 was varied from 0.1 M to 0.9 M. The evaluation of the efficiency of the combined process, in the removal of color and COD from textile wastewater, was investigated. The results showed that the degradation of textile wastewater using HC and HC in combination with other advanced oxidation process (AOP’s) followed a pseudo-first-order reaction kinetic. Under the following operative conditions of pH_ value= 2 and input pressure p_in=4.5 bar, the HC + H2O2 process demonstrated a greater efficiency of 88%, 37%, and 65% the chemical oxygen demand (COD) reduction in 60 minutes for (0.3, 0.7 and 0.9 mol/L,) of H2O2, respectively. combined process could be a useful technology for treating textile wastewater.