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PAHs biodegradation in intertidal surface sediment by indigenous microorganisms.

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Area of Science:

  • Environmental Science
  • Environmental Chemistry
  • Microbiology

Background:

  • Polycyclic Aromatic Hydrocarbons (PAHs) are persistent organic pollutants found in various environments.
  • Intertidal zones are dynamic ecosystems influenced by tidal cycles and sediment composition.
  • Understanding PAH biodegradation is crucial for assessing environmental risks.

Purpose of the Study:

  • To investigate the aerobic biodegradation of PAHs in different sediment size fractions.
  • To determine the relationship between PAH biodegradation and sediment properties like total organic carbon (TOC) and humic coverage index (HCI).
  • To assess the bioavailability and environmental fate of PAHs in intertidal sediments.

Main Methods:

  • Collection and fractionation of sand-dominated (S1) and mud-dominated (S2) sediments from Bohai Bay.
  • 30-day aerobic biodegradation experiments on PAH size fractions.
  • Analysis of dominant PAHs (phenanthrene, fluoranthene, pyrene) and their biodegraded portions.
  • Correlation analysis between biodegraded PAHs and sediment properties (TOC, HCI).

Main Results:

  • Intermediate sediment size fractions (0.031-0.063 mm) exhibited higher PAH biodegradation rates.
  • Biodegraded PAH portions showed negative correlations with both TOC and HCI.
  • The negative correlation with HCI was a novel finding compared to studies on aged sediments.
  • PAH bioavailability in intertidal sediments is influenced by particle size and mobility.

Conclusions:

  • Intertidal sediment particles of intermediate size and mobility offer the greatest PAH bioavailability.
  • Periodic tidal disturbances limit sediment ageing, affecting PAH bioavailability.
  • Findings impact the assessment of PAH environmental fate in dynamic intertidal regions.