Microplastic contamination in different aged landfill mineralization.

Area of Science:

• Environmental Science
• Geochemistry
• Pollution Control

Background:

• Domestic landfills are significant sources and sinks of microplastics (MPs).
• Inadequate landfill management can release MPs, causing secondary pollution.
• Systematic risk assessments are crucial for understanding MP environmental impact.

Purpose of the Study:

• To investigate and quantify microplastic contamination in landfills across diverse economic regions.
• To assess the influence of landfill type, age, and regional economic status on MP pollution.
• To provide a quantitative basis for assessing MP pollution risks and informing mitigation strategies.

Main Methods:

• Investigated three landfills (two sanitary, one informal dump site) in Southeast China.
• Collected 68 mineralized refuse samples.
• Quantified microplastics (polyethylene, polypropylene, polystyrene) using solvent extraction and Py-GC/MS.

Main Results:

• Average MPs concentrations ranged from 0.44 to 1.56 g/kg (mass) and 0.105 to 0.397 g/m³ (volume).
• Sanitary landfills showed higher MPs levels due to prolonged degradation.
• Dump sites had lower MPs but higher diffusion threat due to poor management; contamination risk is linked to landfill age and regional economy.

Conclusions:

• Microplastic contamination in landfills is influenced by landfill type, age, and regional economic status.
• Findings highlight the need for targeted strategies to mitigate microplastic release from landfills.
• This research provides a quantitative foundation for landfill microplastic pollution assessment.