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Stabilized landfill leachate poses a significant environmental threat due to presence of persistent organic pollutants. The leachate let without treatment leads to groundwater contamination. So, it is critical to treat the leachate to forestall contamination. This study investigates the degradation of stabilized landfill leachate using a sulfate radical-based advanced oxidation process (SR-AOP) with a fly ash-supported magnetite catalyst. Fly ash is rich in aluminate and silicate, which prevents magnetite aggregation, enhancing catalytic performance. The SR-AOP system was optimized for pH and persulfate (PS) dose, achieving 88.7 ± 2.6% COD removal at pH 3. At pH 9, near the natural pH of leachate, the process achieved 78.6 ± 2.2% COD removal with the generation of both hydroxyl and sulfate radicals. The process improved the BOD₅,20/COD ratio from 0.036 to 0.44, demonstrating the effectiveness of SR-AOP in treating stabilized leachate.

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Degradation of Organics in Stabilized Landfill Leachate by SR-AOP Using Heterogeneous Fly Ash-Supported Magnetite Catalyst

  • 会议论文

  • 发表日期：

    2026年

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  • S. V. Niveditha,
  • R. Gandhimathi

摘要

Stabilized landfill leachate poses a significant environmental threat due to presence of persistent organic pollutants. The leachate let without treatment leads to groundwater contamination. So, it is critical to treat the leachate to forestall contamination. This study investigates the degradation of stabilized landfill leachate using a sulfate radical-based advanced oxidation process (SR-AOP) with a fly ash-supported magnetite catalyst. Fly ash is rich in aluminate and silicate, which prevents magnetite aggregation, enhancing catalytic performance. The SR-AOP system was optimized for pH and persulfate (PS) dose, achieving 88.7 ± 2.6% COD removal at pH 3. At pH 9, near the natural pH of leachate, the process achieved 78.6 ± 2.2% COD removal with the generation of both hydroxyl and sulfate radicals. The process improved the BOD₅,20/COD ratio from 0.036 to 0.44, demonstrating the effectiveness of SR-AOP in treating stabilized leachate.