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Congrong Yu1, Peiyi Duan1, D A Barry2

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Submerged synthetic aquatic vegetation effectively removes colloids from flowing water. The colloid deposition rate decreases with travel distance, indicating complex retention processes in aquatic vegetation systems.

Keywords:
AdvectionColloidsDLVODeposition rate coefficientDispersionFirst-order kineticsPhysical and chemical conditionsTravel distanceVegetation

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Area of Science:

  • Environmental Engineering
  • Hydrology
  • Water Quality

Background:

  • Particulate nonpoint source pollution poses challenges in aquatic systems.
  • Colloid transport in aquatic vegetation is crucial for understanding pollutant retention.
  • Current models often assume a constant deposition rate, which may be inaccurate.

Purpose of the Study:

  • To investigate the effectiveness of submerged synthetic aquatic vegetation in removing colloids from flowing water.
  • To quantify changes in colloid retention with travel distance within submerged vegetation.
  • To test the assumption of a spatially constant colloid deposition rate coefficient.

Main Methods:

  • Colloid transport experiments were conducted in a 10-m flume with varying fluid velocities, colloid concentrations, and pH.
  • A mathematical model incorporating advection, dispersion, and first-order kinetic deposition was developed.
  • Colloid properties (zeta potential and size) were measured along the transport distance.

Main Results:

  • The colloid deposition rate coefficient exhibited a power-law decrease with travel distance.
  • A steady-state deposition rate was reached before the end of the experimental flume.
  • Observed decreases in deposition rate could not be solely explained by changes in colloid properties or gravity.

Conclusions:

  • The assumption of a constant colloid deposition rate in dense vegetation is not valid.
  • Colloid retention processes in submerged vegetation may be analogous to those in granular media.
  • Further research is needed to fully elucidate the mechanisms driving colloid deposition in aquatic vegetation.