Nonequilibrium sorption of organic contaminants during flow through columns of aquifer materials

L. S. Lee, P. S C Rao, Mark L Brusseau, R. A. Ogwada

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

Batch equilibrium and miscible displacement studies were conducted to investigate sorption and transport of trichloroethylene (TCE) and p-xylene in two sand aquifer materials low in organic carbon content. The utility of a bicontinuum (two-site) sorption model to describe the extent of sorption nonequilibrium during transport in saturated columns was evaluated. Model parameters estimated from the breakthrough curves (BTC) obtained at a high pore-water velocity (v = 24 cm/h) were used successfully to describe the BTC measured at a lower pore-water velocity (v = 6 cm/h). The assumption of local sorption equilibrium was valid at the lower velocity, and the measured BTC could be described by an equilibrium sorption model coupled to a convective-dispersive transport model. Values for column retardation factors estimated by fitting the two-site model to the BTC were comparable with those estimated from equilibrium sorption isotherms. BTC measured for displacement of binary mixtures (TCE plus p-xylene) and single-solute (TCE or p-xylene alone) were identical, suggesting that there is no competitive sorption between these two solutes. These column observations were consistent with sorption isotherm data.

Original languageEnglish (US)
Pages (from-to)779-793
Number of pages15
JournalEnvironmental Toxicology and Chemistry
Volume7
Issue number10
StatePublished - 1988
Externally publishedYes

Fingerprint

Trichloroethylene
Groundwater
Aquifers
Sorption
sorption
aquifer
Impurities
breakthrough curve
pollutant
xylene
Water
trichloroethylene
Carbon
Isotherms
solute
porewater
isotherm
material
4-xylene
Organic carbon

Keywords

  • Ground water contamination
  • p-Xylene
  • Sorption kinetics
  • Transport model
  • Trichloroethylene

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis
  • Environmental Chemistry
  • Environmental Science(all)

Cite this

Nonequilibrium sorption of organic contaminants during flow through columns of aquifer materials. / Lee, L. S.; Rao, P. S C; Brusseau, Mark L; Ogwada, R. A.

In: Environmental Toxicology and Chemistry, Vol. 7, No. 10, 1988, p. 779-793.

Research output: Contribution to journalArticle

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AU - Rao, P. S C

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AU - Ogwada, R. A.

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AB - Batch equilibrium and miscible displacement studies were conducted to investigate sorption and transport of trichloroethylene (TCE) and p-xylene in two sand aquifer materials low in organic carbon content. The utility of a bicontinuum (two-site) sorption model to describe the extent of sorption nonequilibrium during transport in saturated columns was evaluated. Model parameters estimated from the breakthrough curves (BTC) obtained at a high pore-water velocity (v = 24 cm/h) were used successfully to describe the BTC measured at a lower pore-water velocity (v = 6 cm/h). The assumption of local sorption equilibrium was valid at the lower velocity, and the measured BTC could be described by an equilibrium sorption model coupled to a convective-dispersive transport model. Values for column retardation factors estimated by fitting the two-site model to the BTC were comparable with those estimated from equilibrium sorption isotherms. BTC measured for displacement of binary mixtures (TCE plus p-xylene) and single-solute (TCE or p-xylene alone) were identical, suggesting that there is no competitive sorption between these two solutes. These column observations were consistent with sorption isotherm data.

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