Change in gasoline constituent mass transfer during soil venting

Journal Article · · Journal of Environmental Engineering (New York); (United States)

DOI:https://doi.org/10.1061/(ASCE)0733-9372(1994)120:6(1598)· OSTI ID:7054837

Hayden, N J ^[1]; Voice, T C; Wallace, R B ^[2]; Annable, M D ^[3]

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1. Univ. of Vermont, Burlington, VT (United States). Dept. of Civil and Environmental Engineering
2. Michigan State Univ., East Lansing, MI (United States). Dept. of Civil and Environmental Engineering
3. Univ. of Florida, Gainesville, FL (United States). Dept. of Environmental Engineering Science

The mass transfer of gasoline constituents [benzene, toluene, ethylbenzene, xylenes (BTEX), and naphthalene] to air during laboratory-simulated soil vapor extraction (referred to here as soil venting) was determined. Soil venting was conducted on laboratory-packed columns brought to residual water then residual gasoline saturations. The columns contained either a sandy, low organic soil, a sandy organic soil, or glass beads. Gasoline-air partitioning at the start of soil venting was experimentally determined to be adequately described by Raoult's law for many gasoline constituents of interest. The application of the local equilibrium assumption used to describe the mass transfer of gasoline constituents from the residual gasoline to air during soil venting was investigated using: (1) experimental techniques such as reduction of air flow rate; flow-interruption and discrete sampling of soil following soil venting; and (2) a local-equilibrium-base model employing Raoult's law to describe gasoline-air partitioning. The local equilibrium assumption was shown to be valid for describing the mass transfer of various gasoline constituents until such time when the constituent was nearly depleted from the non-aqueous-phase liquid gasoline (NAPL). Mass transfer of constituents became rate-limiting when the constituent was depleted from the residual gasoline. The effect of soil organic matter content was only slightly apparent at this time, as evidenced by the higher benzene and toluene air concentration in the effluent of columns containing the sandy organic soil.

• OSTI ID: 7054837
• Journal Information: Journal of Environmental Engineering (New York); (United States), Journal Name: Journal of Environmental Engineering (New York); (United States) Vol. 120:6; ISSN 0733-9372; ISSN JOEEDU
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020900* -- Petroleum-- Environmental Aspects
ALKYLATED AROMATICS
AROMATICS
BENZENE
CLEANING
CONDENSED AROMATICS
DECONTAMINATION
FUELS
GASOLINE
HYDROCARBONS
LIQUID FUELS
MASS TRANSFER
NAPHTHALENE
OIL SPILLS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
REMEDIAL ACTION
REMOVAL
SIMULATION
SOILS
TOLUENE
XYLENES