Modified Clays for Waste Containment and Pollutant Attenuation
Publication: Journal of Environmental Engineering
Volume 123, Issue 1
Abstract
In this study, the use of organically modified clay to remove the high-strength organic pollutants in leachate as well as reduce its liquid flow was investigated. Various physical and chemical factors that may affect the suitability of using the modified clay in removing and retarding the movement of contaminants have been examined. These factors include the structural stability of the modified clay, soil and swelling properties, sorption capacity for nonpolar and polar organics at different pH solutions, and chemical permeants on clay permeability under different effective stresses. The uptake of eight organics (benzene, toluene, o-xylene, ethylbenzene, phenol, 2-chlorophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol) by organoclay BB-40 is found to be significant and increases with an increase in their hydrophobicity. The hydraulic conductivities of organoclay BB-40 under an effective stress of 70 kN/m2 (∼10 psi) are 7 × 10−9 cm/s to tap water, 1.6 × 10−8 cm/s to landfill codisposal leachate, and 1.1 × 10−7 cm/s to synthetic leachate. The experimental results suggest that the use of organoclay as a liner material would provide a barrier with the ability to effectively remove dissolved organic contaminants, and to resist the flow of leachate.
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References
1.
Annual book of American standard of testing methods, 04.08. ASTM, Philadelphia, Pa.
2.
Benson, C. H., Zhai, H., and Wang, X.(1994). “Estimating hydraulic conductivity of compacted clay liners.”J. Geotech. Engrg., ASCE, 120(2), 366–387.
3.
Boyd, S. A., Mortland, M. M., and Chiou, C. T.(1988a). “Sorption characteristics of organic compounds on hexadecyltrimethylammonium-smectites.”Soil Sci. Soc. Am. J., 52, 652–657.
4.
Boyd, S. A., Shaobai, S., Lee, J. F., and Mortland, M. M.(1988b). “Pentachlorophenol sorption by organo-clays.”Clay and Clay Minerals, 36(2), 125–130.
5.
Boynton, S. S., and Daniel, D. E.(1985). “Hydraulic conductivity tests on compacted clay.”J. Geotech. Engrg., ASCE, 111(4), 465–478.
6.
Daniel, D. E., and Broderick, G. P. (1985). “Stabilization of compacted clay against attack by concentrated organic chemicals.”Rep. GR85-18, Civil Engineering Department, The University of Texas at Austin, Austin, Tex.
7.
Daniel, D. E., and Koerner, R. M. (1993). “Quality assurance and quality control for waste containment facilities.”Rep. EPA/600/R-93/182, Risk Reduction Engineering Laboratory, Cincinnati, Ohio.
8.
Giround, J. P., and Bonaparte, R.(1989). “Leakage through liners constructed with geomembranes-Part I. Geomembrane liners.”Geotextiles and Geomembranes, 8, 26–67.
9.
Jaynes, W. F., and Boyd, S. A.(1990). “Trimethylphenylammonium-smectite as an effective adsorbent of water soluble aromatic hydrocarbons.”J. Air Waste Mgmt. Assn., 40, 1649–1653.
10.
Lee, J. F., Mortland, M. M., Chiou, C. T., Kile, D. E., and Boyd, S. A.(1990). “Adsorption of benzene, toluene, and xylene by two tetramethylammonium-smectites having different charge densities.”Clay and Clay Minerals, 38(2), 113–120.
11.
Lo, I. M.-C.(1994). “Organically modified clays—A potential clay liner material and a variety of waste treatment applications.”Asian Water and Sewage, Asia's J. Envir. Technol., 10, 42–48.
12.
Lo, I. M.-C., Liljestrand, H. M., and Daniel, E. D. (1994). “Hydraulic conductivity and pollutant transport through modified clay liner materials.”Hydr. Conductivity and Waste Contaminant Transport, ASTM STP 1142, ASTM, Philadelphia, Pa., 422–438.
13.
Lo, I. M.-C., and Liljestrand, H. M.(1996). “Laboratory sorption and hydraulic conductivity tests of modified-clay materials.”Waste Mgmt. and Res., 14, 297–310.
14.
Mitchell, J. K., and Madsen, F. T. (1987). “Chemical effects on clay hydraulic conductivity.”Geotech. practice for waste disposal '87, R. E. Woods, ed., ASCE, New York, N.Y., 87–107.
15.
Mortland, M. M., Shaobai, S., and Boyd, S. A.(1986). “Clay-organic complexes as adsorbents for phenol and chlorophenols.”Clay and Clay Minerals, 34(5), 581–585.
16.
Smith, J., and Jaffe, P. R.(1991). “Comparison of tetrachloromethane sorption to an alkylammonium-clay and an alkyldiammonium-clay.”Envir. Sci. Technol., 25(12), 2054–2058.
17.
Xu, S., and Boyd, S. A.(1995). “Cationic surfactant sorption to a vermiculitic subsoil via hydrophobic bonding.”Envir. Sci. Technol., 29, 312–320.
18.
Yong, R. N., and Warkentin, B. P. (1966). Introduction to soil behavior. Macmillan Publishing Co., New York, N.Y.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 123 • Issue 1 • January 1997
Pages: 25 - 32
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Jan 1, 1997
Published in print: Jan 1997
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