Main Title |
Rate of flow of leachate through clay soil liners / |
Author |
Daniel, D. E. ;
Shackelford, C. D. ;
Liao, W. P. ;
Liljestrand, H. M.
|
Other Authors |
|
CORP Author |
Texas Univ. at Austin.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. |
Publisher |
U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory, |
Year Published |
1991 |
Report Number |
EPA/600/2-91/021 |
Stock Number |
PB91-196691 |
Additional Subjects |
Kaolinite ;
Diffusion coefficient ;
Clay soils ;
Porosity ;
Inorganic compounds ;
Soil mechanics ;
Laboratory tests ;
Simulation ;
Solutes ;
Hydraulic gradients ;
Environmental transport ;
Soil liners ;
Leachates ;
Time of travel ;
Anionic tracers ;
Cationic tracers
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB91-196691 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
127 pages : illustrations ; 28 cm |
Abstract |
The objective of the research was to measure the time of travel (TOT) of inorganic solutes through laboratory columns of compacted clay, to determine the physical and geochemical parameters that controlled solute transport through the soil columns, and to compare measured and predicted TOT's. Two clay soils were used: kaolinite (a low-plasticity, commercially-produced clay) and Lufkin clay (a highly plastic, naturally-occurring clay soil). Anionic tracers were chloride and bromide; potassium and zinc were the cationic tracers. Diffusion cells were designed, constructed, and used to measure the effective diffusion coefficient of the tracers in the two soils. Diffusion coefficients for anions were typically 0.000002 to 0.000007 sq cm/s; somewhat lower values were determined for cations. Column tests showed that the effective porosity ratio (defined as effective divided by total porosity) increased with increasing hydraulic gradient in kaolinite from a low of about 0.25 at a gradient of 1 to a high of 1 at a gradient of 20. With Lufkin clay, the effective porosity ratio was between 0.02 and 0.16. Breakthrough times were controlled much more by the low effective porosities than by molecular diffusion. The computer program SOILINER predicted times of travel that were larger than actual TOT's by a factor of up to 52. The failure to account for effective porosity ratios less than 1 was the cause for the poor predictions from SOILINER. |
Notes |
Includes bibliographical references. "EPA 600/2-91/021." Microfiche. |
Place Published |
Cincinnati, OH : |
Supplementary Notes |
Sponsored by Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. |
Corporate Au Added Ent |
Risk Reduction Engineering Laboratory (U.S.) |
PUB Date Free Form |
{1991} |
NTIS Prices |
PC A07/MF A01 |
BIB Level |
m |
Cataloging Source |
OCLC/T |
OCLC Time Stamp |
20010118134907 |
Language |
eng |
Origin |
NTIS |
Type |
MERGE |
OCLC Rec Leader |
01031nam 2200265Ka 45020 |