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Interactions between microplastics and heavy metals in leachate: Implications for landfill stabilization process.

Jiabao Chen1, Lin Huo2, Ying Yuan3

  • 1State Key Laboratory of Environmental Criteria and Risk Assessment, and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China.

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Summary

Microplastics in landfill leachate carry heavy metals like chromium (Cr) and arsenic (As). Landfill stabilization affects these interactions, with smaller microplastics showing stronger correlations with Cr and As.

Keywords:
Heavy metalsInteraction relationshipsLandfillMicroplasticsStabilization process

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Materials Science

Background:

  • Landfills release microplastics and heavy metals, impacting environmental behavior.
  • Microplastics adsorb heavy metals, complicating their fate in leachate.
  • The effect of landfill stabilization on microplastic-heavy metal interactions remains unclear.

Purpose of the Study:

  • To investigate microplastic and heavy metal characteristics in Beijing landfill leachate.
  • To understand the influence of landfill stabilization on these contaminants.
  • To explore the correlations between microplastics and heavy metals during stabilization.

Main Methods:

  • Sampling leachate from 10 landfills in Beijing.
  • Quantifying microplastic abundance, size, and type.
  • Measuring heavy metal concentrations (Cr, As, etc.).
  • Statistical analysis of microplastic-heavy metal correlations.

Main Results:

  • Average microplastic abundance was 196.3 items/L, primarily small (20-50 µm) and film types.
  • Chromium (Cr) and Arsenic (As) were the most prevalent heavy metals.
  • Microplastic abundance and polymer diversity decreased with landfill stabilization.
  • Significant parabolic correlations were found between microplastics and heavy metals, with Cr and As strongly linked to smaller microplastics (20-30 µm).

Conclusions:

  • Landfill stabilization alters microplastic-heavy metal interactions.
  • Cr and As show a particular susceptibility to stabilization processes.
  • Findings provide a scientific basis for waste leachate management and pollutant control.