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A Comparison of Sorption Equilibrium Distribution Coefficients Using Batch and Centrifugation Methods

CH2M Hill Inc., 2300 NW Walnut, Corvallis, OR 97330

S. L. Woods^*, T. S. Vinson and J. D. Istok

Dep. of Civil Eng., Oregon State Univ., Corvallis, OR 97331-2302.

^* Corresponding author.

ABSTRACT

Sorption equilibrium distribution coefficients, K_d's, are often used in solute transport models to predict the movement of hazardous wastes in soils. K_d values can be determined in the laboratory by performing batch equilibrium tests or column studies. However, these tests suffer from disadvantages. Batch tests may overestimate sorption in natural soils due to the solids effect, and column studies conducted with fine-grained soils require a long time to conduct. Centrifugation testing can alleviate these disadvantages by testing a soil column instead of a soil suspension, by imposing a confining stress on the soil, and by producing a greater pore water velocity. Centrifuge experiments were conducted on a kaolinite/phenol system using a constant head permeameter and a laboratory centrifuge. K_d values were estimated by modeling the generated breakthrough curves with a solute transport model. K_d values obtained in the centrifuge experiments were compared with K_d values measured in batch equilibrium tests. Although the K_d values determined in the centrifuge were slightly lower than the values predicted by extrapolating the batch data, the results were consistent with the solids effect.

formerly Dep. of Civil Eng., Oregon State Univ.;

Received for publication May 14, 1988.

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