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Fluid mud consolidation delayed by extracellular polymer substances.

Qixiu Pang1, Ruibo Zhang1, Chunpeng Wen1

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Newly isolated Burkholderia vietnamiensis impacts fluid mud consolidation. Its extracellular polymer substances (EPS) content negatively correlates with consolidation velocity, with 2.34 g/l critical for nautical applications.

Keywords:
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Area of Science:

  • Microbiology
  • Environmental Science
  • Geotechnical Engineering

Background:

  • Fluid mud poses challenges in nautical depth maintenance.
  • Microbial activity, specifically from bacteria like Burkholderia vietnamiensis, can influence sediment properties.
  • Extracellular Polymer Substances (EPS) are key microbial products affecting sediment behavior.

Purpose of the Study:

  • To investigate the influence of Burkholderia vietnamiensis on fluid mud consolidation.
  • To characterize the role of EPS in sediment settling and consolidation.
  • To determine critical EPS content for nautical-depth applications.

Main Methods:

  • Isolation and screening of Burkholderia vietnamiensis from harbor mud.
  • Laboratory experiments to assess fluid mud consolidation.
  • Analysis of EPS characteristics and content.
  • Mathematical modeling of settling and permeability regimes.

Main Results:

  • Burkholderia vietnamiensis was isolated and its effects studied.
  • Self-weight consolidation was modeled using exponential and logarithmic equations for settling and permeability, respectively.
  • EPS content negatively correlates with sediment consolidation velocity.
  • A high polysaccharide/protein ratio in EPS is a potential indicator for bacterial selection.
  • Critical EPS content for extending nautical depth usage was estimated at 2.34 g/l.

Conclusions:

  • Burkholderia vietnamiensis and its EPS significantly affect fluid mud consolidation.
  • EPS content, not its trend influence, is crucial for consolidation velocity.
  • EPS with a high polysaccharide/protein ratio is a promising factor for selecting bacteria for nautical applications.
  • The identified critical EPS concentration provides a quantitative target for sediment management in nautical depths.