Transport of hydrophobic organics by colloids through porous media 1. Experimental results

I. Sojitra, K. T. Valsaraj, D. D. Reible, L. J. Thibodeaux

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Abstract

The transport of two hydrophobic organic compounds (HOCs), namely, phenanthrene and pyrene, through model porous media (glass microsphere and quartz sand) in the presence of a homogenous colloid (polystyrene latex) was studied. The sorption and desorption of colloids were dependent on the pH and ionic strenght of the porewater. The sorption of colloids was only partially reversible even after modifying the aqueous solution chemistry, viz. the ionic strength and pH. The organic sorption on the porous media was directly related to the behavior of colloids. In the absence of an electrolyte, the HOCs showed an early brakthrough in the presence of the colloids compared to that without colloids. At higher ionic strength, the colloids were deposited on the porous medium. Owing to their high sorbed mass on the colloids, the HOCs remained on the porous material, thus decreasing their mobility in the column. Mobile colloids in porewater have been shown to impact the transport of HOCs through porous media.

Original languageEnglish
Pages (from-to)197-211
Number of pages15
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume94
Issue number2-3
DOIs
StatePublished - Jan 20 1995

Keywords

  • Coloids
  • Hydrophobic organic compounds
  • Phenanthrene
  • Porous media
  • Pyrene

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