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Pore-Scale Hydrodynamics in a Progressively Bioclogged Three-Dimensional Porous Medium: 3-D Particle Tracking

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Biofilms cause bioclogging, altering flow in porous media. This study quantifies how bacterial growth changes flow dynamics and solute transport over time, revealing evolving preferential pathways.

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Area of Science:

  • Environmental microbiology
  • Porous media physics
  • Transport phenomena

Background:

  • Biofilms are bacterial communities in porous media like soil and filters.
  • They are crucial for pollutant degradation and water purification.
  • Bioclogging by biofilms alters pore structure and solute transport, but temporal changes are poorly understood.

Purpose of the Study:

  • To experimentally investigate hydrodynamic changes during progressive bioclogging.
  • To quantify temporal variations in solute transport behavior.
  • To understand how bacterial growth impacts flow dynamics in porous media.

Main Methods:

  • Used a transparent 3-D porous medium to observe bioclogging.
  • Performed statistical analyses of hydrodynamics at multiple time points.
  • Applied a continuous time random walk model with stochastic velocity relaxation.

Main Results:

  • Observed exponential increases in flow velocity, variance, and correlation length.
  • Transport became more superdiffusive, indicating preferential flow paths and stagnation zones.
  • Flow evolved from parallel to serial pore arrangements with increasing bioclogging.

Conclusions:

  • Hydrodynamic changes correlate with bacterial exponential growth.
  • A gamma distribution effectively describes Lagrangian velocity distributions.
  • The developed model accurately predicts transport behavior during bioclogging.