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Polycyclic aromatic hydrocarbons in processed yard trash.

Ying Guo1, Steven J Laux1, Melissa Burdier1

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Polycyclic aromatic hydrocarbon (PAH) levels in yard trash are highest when freshly ground and lowest after composting. Some processed yard trash exceeds safety levels, impacting land application assessments.

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Area of Science:

  • Environmental Science
  • Environmental Chemistry
  • Waste Management

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are environmental contaminants of concern.
  • Yard trash management involves collection, processing, and composting.
  • Land application of some wastes is restricted due to PAH content.

Purpose of the Study:

  • To quantify polycyclic aromatic hydrocarbon (PAH) concentrations in yard trash throughout its management cycle.
  • To compare PAH levels in yard trash with regulatory screening levels.
  • To assess the implications of PAH concentrations for land application practices.

Main Methods:

  • Samples of yard trash were collected from 10 Florida locations.
  • Total extractable PAH concentrations were measured using gas chromatography.
  • Concentrations of 16 specific PAH compounds were analyzed.

Main Results:

  • PAH concentrations in processed yard trash ranged from 0.38 to 14 mg kg-1.
  • Residential yard trash had PAH levels below US EPA screening levels.
  • Yard trash from waste facilities, especially newly ground material, often exceeded screening levels.

Conclusions:

  • Composting significantly reduces PAH concentrations in yard trash.
  • High PAH levels in processed yard trash may necessitate re-evaluation of land-applied waste risk assessments.
  • Findings highlight the importance of managing yard trash to minimize potential environmental risks.