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

  • Zheqing Huang
  • Zhepei Gu
  • Ying Wang
  • Aiping ZhangEmail author
Research Article
  • 6 Downloads

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.

Keywords

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

Notes

Funding information

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

Supplementary material

11356_2019_6592_MOESM1_ESM.docx (110 kb)
ESM 1 (DOCX 109 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zheqing Huang
    • 1
  • Zhepei Gu
    • 1
  • Ying Wang
    • 1
  • Aiping Zhang
    • 1
    Email author
  1. 1.Key Laboratory of Special Wastewater Treatment of Sichuan Province Higher Education System, College of Chemistry and Materials ScienceSichuan Normal UniversityChengduChina

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