Transport of hydrophobic organics by colloids through porous media 2. Commercial humic acid macromolecules and polyaromatic hydrocarbons

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

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In Part 1 of this series [Colloids Surfaces A: Physicochem. Eng. Aspects, 94 (1995) 197] we reported the influence of a model colloid (polystyrene latex) on the transport of pollutants through a model porous medium (glass beads). In this paper the influence of commercial Aldrich humic acid macromolecules on the partitioning and transport of polyaromatic hydrocarbons (PAHs) through two different porous media under carefully controlled pH and ionic strength conditions are reported. The PAHs studied were pyrene, phenanthrene and dibenzofuran, and the porous media used were glass beads and quartz sand subjected to extensive cleaning procedures to obtain reproducible surfaces. The influence of ionic strength on the transport of PAHs through the porous media in the presence and absence of humic acid macromolecules were explored. Under low ionic strength conditions, the humic acid macromolecules enhanced the transport of PAHs through the porous media; however, at high ionic strength the deposition of humic acid on the porous media retarded the transport of PAHs. The effects of different types of inorganic salts were studied. CaCl2 had a greater effect than KCl in retarding the movement of humic acid macromolecules and PAHs through the column.

Original languageEnglish
Pages (from-to)141-157
Number of pages17
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume110
Issue number2
DOIs
StatePublished - May 15 1996

Keywords

  • Colloids
  • Humic matter
  • Polyaromatic organics
  • Porous media
  • Transport

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