Fischer-Tropsch synthetic wastewater treatment with Fe/Mn@CH: Catalytic ozonation and process evaluation

In this study, the honeycomb ceramic catalyst Fe/Mn@CH with high catalytic activity was prepared. The effect of preparation conditions on the catalytic performance of Fe/Mn@CH was systematically studied. Scanning electron microscope; X-ray energy spectrum analysis; X-ray diffraction; specific surface area, pore distribution and adsorption performance analysis; X-ray fluorescence spectroscopy; and X-ray photoelectron spectroscopy were performed to analyze the structural characteristics of the catalyst. The optimal working conditions of the catalytic ozonation system for the degradation of Fischer-Tropsch synthesis wastewater were also studied. The metal elements Fe and Mn were successfully loaded on the surface of the honeycomb ceramic carrier in the form of alpha-MnO2 and alpha-Fe2O3 oxides. The optimal COD removal rate could reach 64.37% at pH of 9, ozone dosage of 6 g/ h, Fe/Mn@CH dosage of 50 g/300 mL, and reaction time of 60 min. The specific mechanism of catalytic ozonation in the presence of tert-butanol was explored through ultraviolet absorption spectroscopy and threedimensional fluorescence spectroscopy. The COD removal efficiency for Fischer-Tropsch synthesis wastewater was analyzed on the basis of catalytic oxidation reaction kinetics. Finally, a multilevel gray correlation evaluation model was established for the quantitative evaluation of the ozonation catalytic oxidation of Fischer-Tropsch wastewater.

Automated summary

In this study, a honeycomb ceramic catalyst Fe/Mn@CH with high catalytic activity was prepared and its optimal working conditions and mechanism in the degradation of Fischer-Tropsch synthesis wastewater were systematically studied.