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Related Experiment Videos

Stabilized leachates: sequential coagulation-flocculation + chemical oxidation process.

F Javier Rivas1, Fernando Beltrán, Fátima Carvalho

  • 1Departamento de Ingeniería Química y Energética, Universidad de Extremadura, Av. Elvas S/N, Badajoz 06071, Spain. fjrivas@unex.es

Journal of Hazardous Materials
|November 25, 2004
PubMed
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This study demonstrates a combined sedimentation-chemical oxidation process for treating landfill leachate, achieving up to 90% chemical oxygen demand removal. Kynch theory aids in designing sedimentation tanks for efficient leachate treatment.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Chemical Oxidation

Background:

  • Landfill leachate poses significant environmental challenges due to its high chemical oxygen demand (COD).
  • Effective treatment methods are crucial for mitigating the ecological impact of landfill operations.

Purpose of the Study:

  • To investigate a combined sedimentation-chemical oxidation process for treating medium-stabilized landfill leachate.
  • To assess the efficiency of sequential treatment stages in removing COD.
  • To apply Kynch theory for the design of sedimentation units.

Main Methods:

  • Sequential treatment involving pH adjustment, Fe(III) coagulation-flocculation, Fenton oxidation, and final coagulation-flocculation.
  • Chemical oxidation using Fenton's reagent (Fe(III) and H2O2).

Related Experiment Videos

  • Application of Kynch theory for clarifier design based on solids loading.

    • Main Results:

    • Achieved approximately 25% COD removal via initial pH decrease.
    • Further COD removal of approximately 40% with Fe(III) addition.
    • Fenton oxidation removed approximately 80% of COD from the supernatant.
    • Final coagulation-flocculation achieved a total COD removal of approximately 90%.

    Conclusions:

    • The combined sedimentation-chemical oxidation process is highly effective for landfill leachate treatment.
    • Sequential application of coagulation-flocculation and Fenton oxidation significantly reduces COD.
    • Kynch theory provides a viable framework for designing efficient sedimentation clarifiers for leachate treatment.