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Suspended sediments mediate microplastic sedimentation in unidirectional flows.

Mirco Mancini1, Teresa Serra2, Jordi Colomer2

  • 1Department of Civil and Environmental Engineering, University of Florence, Via S. Marta 3, 50139 Florence, Italy.

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Sediment significantly enhances microplastic (MP) downward transport in aquatic systems. Higher sediment concentrations lead to greater MP settling, with varying scavenging rates for different MP types.

Keywords:
Plastic fibersPlastic fragmentsScavengingSediment interactionSedimentation rateShallow aquatic system

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Area of Science:

  • Environmental Science
  • Oceanography
  • Ecotoxicology

Background:

  • Microplastic particles (MP) are a growing environmental concern in aquatic ecosystems.
  • Their transport mechanisms, especially in relation to sediment, are not fully understood.

Purpose of the Study:

  • To investigate the influence of sediment on microplastic transport in a unidirectional flow.
  • To analyze the interaction between different microplastic types and sediment concentrations.

Main Methods:

  • Laboratory flume experiments simulating unidirectional flow with microplastic plumes.
  • Testing three microplastic types (Polyamide fragments, Polyvinyl Chloride fragments, Polyethylene Terephthalate fibers).
  • Utilizing four sediment concentrations (0, 15, 30, 45 g/l).

Main Results:

  • Sediment presence consistently increased the vertical transport of microplastics to the bottom.
  • Higher sediment concentrations resulted in a greater downward flux of microplastics.
  • Sediment particles scavenged Polyamide fragments most effectively, followed by Polyethylene Terephthalate fibers, then Polyvinyl Chloride fragments.

Conclusions:

  • Sediment-laden plumes can induce differential settling of microplastics.
  • Microplastic scavenging by sediment may lead to altered sedimentation patterns.
  • This process can increase microplastic accumulation near pollution sources.