Nano-Fe3O4/Diatomite Catalytic Ozone Treatment of Leachate Membrane Filtration Concentrate

The effluent from the landfill leachate membrane filtration concentrate was used as the research object, and the diatomite-loaded nano-Fe3O4 was prepared as a catalyst to catalyze the ozone treatment concentrate. The effects of initial pH of solution, volumetric flow rate of ozone, and dosage of catalyst on treatment efficiency were investigated. The results showed that when the initial pH of the solution was 7, the volumetric flow rate of ozone was 1.0 L·min-1, the dosage of catalyst was 0.8 g·L-1, and the reaction time was 90 min,the chemical oxygen demand（COD） and UV254 removal rates were 67.8% and 86.3%, respectively. 3 D-EEM and GC-MS analyses of the influent and effluent water showed that after the catalytic ozonation treatment, the refractory substances such as humic acid, fulvic acid and tryptophan in the concentrate were greatly reduced; the mass fraction of alkanes, phenols and heterocyclics decreased, while alkane deravatives increased. It is indicated that the diatomite-loaded nano-Fe3O4 catalyzed ozone has a good treatment effect on the concentrate.