Soil Vapour Extraction of Synthetic Gasoline Mixture:<br>Experimental Observations and Model Predictions<br>

Soil Vapour Extraction of Synthetic Gasoline Mixture:
Experimental Observations and Model Predictions

Abstract:

Soil vapor extraction (SVE) is an in situ depollution technology that removes the volatile organic compounds (VOCs) introduced into the unsaturated (vadoze) zone of the soil through various sources. The leakage of fuels (gasoline or gas oil), fuel oil and lubricants into soil due to deteriorating underground storage tanks, malfunction of process equipment and accidents of various kinds have become the most widespread contamination source. Therefore, the purpose of this paper is to investigate the removal of a synthetic multicomponent volatile organic compounds mixture that simulates a real fuel composition. The influence of the contaminants aging time and the process vacuum value on the extraction efficiency and depollution time has also been analyzes. The results show that extraction efficiency decrease with increasing of pollution aging time. The increasing of vacuum increases the extraction efficiency and decrease de depollution time. In order to determine and monitor the in-situ composition of the contaminant mixture during soil vapour extraction process, a simple analytical model is presented. In the set-up of the model was considered that the total mass of volatile organic compounds exists in four forms: as vapours, nonaqueous phase liquid (NAPL), in the soil solution and adsorbed to soil particles. In steady state, the partitioning between these phases was considered at equilibrium and it was described by physical laws (Henry law, Raoult law, ideal gas law). The dynamic behaviour of soil vapour extraction experiments proved a non-equilibrium behaviour, which was expressed in the model by using a transfer coefficient kr. The accuracy of the model was tested by comparing the predicted results with the experimental data and by using the following performance criteria: standard deviation and correlation coefficient. The model performed relatively well, being capable to describe the studied soil vapour extraction process. Keywords: soil vapour extraction, VOC, modelling

Issue: 2007, Volume 58, Issue 12

Pages:

Publication date: 2001/1/1

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This article is published under the Creative Commons Attribution 4.0 International License

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