Comparison of Soil Extraction Isotherms of Soil Samples Saturated With Nonpolar Liquids |
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Authors: | András Makó Barbara Elek |
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Institution: | (1) Georgikon Faculty of Agriculture, Department of Soil Science and Agrochemistry, University of Veszprém, Deák F. u. 16, H8360 Keszthely, Hungary |
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Abstract: | In multiphase systems capillary pressures play a significant role on fluid movement and retention. The facility to predict
the effect of different thermal remediation strategies requires the knowledge of the effect of temperature on capillary pressure-saturation
relationships in the soils.
The objective of recent study was (a) to develop a technique for routinely measuring the pressure-saturation curves of soil
samples saturated with a nonpolar liquid at different regulated temperatures (b) to build a database using the measured pressure-saturation
curves and the physical, chemical properties of the model soils (c) to establish the dependence of nonaqueous phase liquid
retention on the soil properties and the temperature.
The retention curves (extraction isotherms) with nonaqueous phase liquid were determined using a modified
pressure plate extractor. The wetting phase was a non-aromatic hydrocarbon distillation product. Pressure plates were designed and constructed in
the laboratory of our department. The temperature was held constant at 20, 40 and 60 ∘C.
Statistical analysis was performed involving selected soil parameters and the measured nonaqueous phase liquid retention data.
The results show that knowing some easily measurable soil parameters (bulk density, particle size distribution, humus and
lime content) we can estimate the nonaqueous phase liquid retention of the soils. The measured “extraction isotherms” provide
essential information about the temperature-dependency of pressure-saturation curves. |
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Keywords: | extraction isotherms hydrocarbon spill NAPL retention pressure plate extractor pressure-saturation curves soil pollution temperature-dependency |
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