Measurement error and spatial variability effects on characterization of volatile organics in the subsurface

Article Abstract:

Soil at a former land treatment facility for waste oils and solvents was intensively studied using two different methods to determine if volatile organic compounds (VOC) were present. The results showed that on-site VOC concentrations obtained using heated headspace'gas chromatography were approximately 10 times higher than off-site VOC measurements obtained using purge-and-trap gas chromatography mass spectrometry method. It is concluded that cost-effective field analyses can be more effective when sample density is large.

Basic Chemical Manufacturing, Industrial Organic Chemicals, Organic Chemicals, Measurement, Soils, Organic compounds

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Modeling of field tests

Article Abstract:

A theoretical heat and mass transfer model was developed to characterize the process of mixed region vapor stripping and compared with field test results. The mass transfer coefficient that described the linear vapor-water-soil partitioning process showed independence from temperatures up to 30 degrees centigrade. However, the coefficient exhibited a functional relationship with process treatment volume.

Models, Mass transfer, Heat-transfer media, Heat transfer media

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Full-scale field experiments

Article Abstract:

Mixed region vapor stripping (MRVS) was evaluated for in situ treatment of contaminated fine-grained soils. Field tests were conducted involving seven columns that were contaminated by volatile organic compounds (VOCs). The columns were subjected to ambient air and heated air. MRVS showed substantial ability in removing VOC contaminants in the soil samples at 88%-98%.

Research, Contamination (Technology)

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