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

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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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Authors and Affiliations

  1. Key Laboratory of Special Wastewater Treatment of Sichuan Province Higher Education System, College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China

    Zheqing Huang, Zhepei Gu, Ying Wang & Aiping Zhang

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  1. Zheqing Huang
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  2. Zhepei Gu
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  3. Ying Wang
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Correspondence to Aiping Zhang.

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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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