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Experimental study of interception effect by submerged dam on microplastics.

Jianhao Jiang1, Lulu He2, Junping Liu2

  • 1College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, Zhejiang, China.

Journal of Hazardous Materials
|September 25, 2024
PubMed
Summary

Submerged dams trap microplastics (MPs), with Polyvinyl chloride (PVC) and Polystyrene (PS) accumulating behind them. Interception rates depend on flow velocity, distance, and MP concentration.

Keywords:
Flow flumeInterception rateMicroplasticsRedundancy AnalysisSubmerged dam

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Area of Science:

  • Environmental Science
  • Fluid Dynamics
  • Environmental Chemistry

Background:

  • Microplastics (MPs) pose a significant environmental threat, altering aquatic ecosystems.
  • Submerged dams can influence the transport and fate of MPs in waterways.

Purpose of the Study:

  • To investigate the interception rates of Polyvinyl chloride (PVC) and Polystyrene (PS) by an artificial submerged dam.
  • To analyze the impact of environmental factors on MP interception by submerged dams.

Main Methods:

  • Conducted flow flume experiments to measure MP interception rates.
  • Utilized linear regression fitting and Redundancy Analysis (RDA) to correlate interception rates with environmental factors.

Main Results:

  • Most un-intercepted PVC and PS particles accumulated behind the dam under subcritical and turbulent flows.
  • Interception rates increased with distance from the dam but decreased with higher flow velocity and MP concentration.
  • RDA identified flow velocity, distance to dam, and MP concentration as key influencing factors.

Conclusions:

  • Submerged dams act as sinks for MPs, influencing their distribution in aquatic environments.
  • Understanding these mechanisms is crucial for managing MP pollution.