Catalytic ozonation of industrial textile wastewater using modified C-doped MgO eggshell membrane powder

Abstract

This effort demonstrates preparation and characterization of carbon-doped magnesium oxide (C-MgO) doped on an eggshell membrane powder (C-MgO-EMP) as a catalyst. The catalytic activity of C-MgO-EMP was assessed in a catalytic ozonation process (COP) for treating a real textile wastewater. A 43 full factorial design (FFD) was conducted to plan an experimental series in the catalytic treatment of the textile wastewater via a C-MgO-EMP catalyst. In the catalytic treatment process with the as-prepared catalyst, the test conditions were optimized at an ozone flow rate = 0.4 L/min, a catalyst dose = 0.23 g/L, and reaction time = 10 min. The catalytic efficiency of the C-MgO-EMP catalyst in the degradation (decolorize based on ADMI color unit) and mineralization (TOC removal) of the real textile wastewater was calculated to be 93% and 78%, respectively. The prepared catalyst had better potential catalytic activity (synergetic effect = 52%) than the commercial activated carbon (CAC) and O3 in TOC removal. Based on the kinetic study, the ratio of Koverall-c-MgO-EMPTOCKoverall-CACTOC was indicated to be 1.584. Kinetic results demonstrated that the mineralization rate in COP with C-MgO-EMP catalyst is 9.05 times higher than the CAC/O3 process.