Abstract: The waste FCC catalyst was used as catalyst for catalytic ozonation of amine-containing wastewater. The effects of ozone concentration, waste FCC catalyst addition, wastewater initial pH value, and reaction temperature on the reduction efficiency of COD in amine-containing wastewater were investigated, and the catalytic oxidation effect of waste FCC catalyst was compared with conventional ozonation catalysts used in industry. The factors affecting the kinetics of the ozone catalytic oxidation of organic amines by waste FCC catalyst were analyzed, and the apparent reaction rate constants under different conditions were determined. The results show that increasing the ozone concentration and the amount of waste catalyst can accelerate the reduction rate of COD in wastewater; alkaline conditions will promote the decomposition of ozone to produce hydroxyl radicals (.OH) and speed up the oxidation reaction rate; the appropriate increase of the reaction temperature is beneficial to the oxidation reaction, but too high temperature will reduce the solubility of ozone; the synergistic catalytic oxidation effect of waste FCC catalyst is obviously better than conventional ozonation catalysts. The results of kinetic analysis show that ozone catalytic oxidation of wastewater containing amine at different pH, temperature and the amount of waste catalyst addition is consistent with the first-order reaction kinetics.

Key words: waste FCC catalyst, ozone, catalytic oxidation, COD, kinetics