Improved oxidation of refractory organics in concentrated leachate by a Fe2+-enhanced O3/H2O2 process

Abstract

Concentrated leachate from membrane processes, which contains a mass of refractory organics and salt, has become a new problem for wastewater engineers. In this study, removal of organic contaminants in concentrated landfill leachate was investigated by applying the ferrous ion (Fe2+) catalyzed O3/H2O2 process. The maximum chemical oxygen demand (COD) and absorbance at 254 nm (UV254) removal efficiencies under the optimal conditions (initial pH = 3.0, Fe2+ dosage = 6.500 mM, H2O2 dosage = 18.8 mM and O3 dosage = 52.65 mg min−1) were 48.82% and 63.59%, respectively. These were higher than those achieved using the Fe2+/O3, O3/H2O2, and O3 processes, and biodegradability of the leachate was improved significantly. Moreover, compared with other processes, the Fe2+ had a stronger catalytic effect. Molecular distribution analysis and three-dimensional excitation and emission matrix analysis both indicated that the fulvic acid and humic acid in the concentrated leachate were greatly degraded. Ultraviolet-visible spectra showed that the Fe2+/O3/H2O2 process mainly destroyed unsaturated bonds and decreased the aromatic degree of the leachate. The reaction mechanism of the Fe2+/O3/H2O2 process mainly was attributed to three factors: (1) O3 and H2O2 reacting to produce OH; (2) H2O2 and O3 decomposing into OH through the oxidation of Fe2+ to Fe3+; and (3) coagulation by Fe (OH)3. The OH can rapidly degrade recalcitrant organics, and coagulation also increases the removal of organic matter. Therefore, the Fe2+/O3/H2O2 process was an effective method for treating concentrated landfill leachate.

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Funding

The authors gratefully acknowledge the financial support from China’s National Students’ Platform for Innovation and Entrepreneurship Training Program (201810636158).

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Huang, Z., Gu, Z., Wang, Y. et al. Improved oxidation of refractory organics in concentrated leachate by a Fe2+-enhanced O3/H2O2 process. Environ Sci Pollut Res 26, 35797–35806 (2019). https://doi.org/10.1007/s11356-019-06592-y

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Keywords

  • Fe2+/O3/H2O2
  • Concentrated leachate
  • Biodegradability
  • UV-Vis
  • 3D-EEM