Treatment of landfill leachate biochemical effluent using the nano- Fe_3O_4/Na_2S_2O_8 system: Oxidation performance, wastewater spectral analysis, and activator characterization

摘要

AbstractNano-Fe3O4was used as heterogeneous catalyst to activate Na2S2O8for the generation of the sulfate radicals (SO4−) to oxidize the residual pollutants in landfill leachate biochemical effluent. The oxidation performance, wastewater spectral analysis and activator characterization were discussed. Oxidation experimental result shows that nano-Fe3O4has obvious catalytic effect on Na2S2O8and can significantly enhance the oxidation efficiencies of Na2S2O8on landfill leachate biochemical effluent, with COD and color removals above 63% and 95%, respectively. Based on the analyses of three-dimensional excitation emission matrix fluorescence spectrum (3DEEM), ultraviolet–visible spectra (UV–vis), and Fourier Transform infrared spectroscopy (FTIR) of wastewater samples before and after treatment, it can be concluded that the pollution level of dissolved organic matter (DOM) declined and that the humic acid (HA) fractions were efficiently degraded into small molecules of fulvic acid (FA) fractions with less weight and stable structure. Compared to the raw wastewater sample, the aromaticity and substituent groups of the DOM were lessened in the treated wastewater sample. Moreover, the main structure of the organics and functional groups were changed by the Fe3O4/Na2S2O8system, with substantial decrease of conjugated double bonds. The micro morphology of nano-Fe3O4was characterized before and after reaction by the methods of scanning electron microscope spectra (SEM), X-ray diffraction pattern (XRD), and X-ray photoelectron spectroscopy (XPS). The XRD pattern analysis showed that nano-Fe3O4was oxidized into r-Fe2O3and that the particle size of it also became smaller after reaction. XPS was employed to analyze the content and iron valence on the nano-Fe3O4surface, and it can be found that the ratio of Fe3+/Fe2+decreased from 1.8 before reaction to 0.8 after reaction. From the SEM analysis after the treatment, it was determined that the spacing between nano-Fe3O4was increased, but in turn, the particles decreased in diameter.Highlights•Sulfate radicals (SO4−) oxidation was introduced to treat landfill leachate biochemical effluent.•Nano-Fe3O4was evaluated to activate Na2S2O8as a heterogeneous catalyst.•Fe3O4/Na2S2O8system was proved to be an efficient and promising approach for the treatment of leachate biochemical effluent.•Wastewater sample before and after treatment was analyzed by 3DEEM, UV–Vis, and FTIR.•Nano-Fe3O4before and after used was characterized by XRD, XPS, and SEM.