Assessment of in situ solvent extraction for remediation of coal tar sites. Column studies

Journal Article · · Water Environment Research; (United States)

DOI:https://doi.org/10.2175/106143095X131141· OSTI ID:6781693

Roy, S B; Ali, M A; Dzombak, D A ^[1]

---

1. Carnegie Mellon Univ., Pittsburg, PA (United States)

Part of a study to assess the feasibility of coal tar site remediation by the injection and recovery of water-miscible, biodegradable solvents is described. The overall objective of the study was to obtain estimates of cleanup times and solvent volumes required for a hypothetical contaminated site. We describe the results of column experiments, performed by passing solvent-water solutions through glass bead-packed columns contaminated with coal tar blobs at low volumetric saturation. This experimental design allowed the investigation of dissolution rate limitations at residual saturations similar to those observed in the field, albeit under more homogeneous conditions. The column effluent data were modeled with a modified advection-dispersion equation that includes a mass-transfer source term for coal tar dissolution. This source term empirically relates mass transfer to experimental variables such as coal tar saturation and solvent flow velocity using fitting parameters. Values of parameters in the mass-transfer source term were estimated from experimental data. The modeling approach and the parameter values developed in this study have been used in simulations of the in situ solvent extraction process. 63 refs., 6 figs., 3 tabs.

• OSTI ID: 6781693
• Journal Information: Water Environment Research; (United States), Journal Name: Water Environment Research; (United States) Vol. 67:1; ISSN 1061-4303; ISSN WAERED
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010900 -- Coal
Lignite
& Peat-- Environmental Aspects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400100 -- Analytical & Separations Chemistry
COAL TAR
CONTAMINATION
DATA
DISSOLUTION
EXPERIMENTAL DATA
EXTRACTION
EXTRACTION APPARATUSES
EXTRACTION COLUMNS
GROUND WATER
HYDROGEN COMPOUNDS
IN-SITU PROCESSING
INFORMATION
MASS TRANSFER
NUMERICAL DATA
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PROCESSING
REMEDIAL ACTION
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SITE CHARACTERIZATION
SOLVENT EXTRACTION
TAR
WATER