Organoclay with Soil-Bentonite Admixture as Waste Containment Barriers
Publication: Journal of Environmental Engineering
Volume 127, Issue 8
Abstract
Organoclays, clays modified by cationic surfactants, for engineering applications have recently drawn great attention because of their high organic removal capacity. In this study, the potential use of organoclays with soil-bentonite admixtures as waste containment barriers is investigated by experimental tests such as batch equilibrium sorption studies, compaction tests, and hydraulic conductivity tests. Sorption isotherms of total organic carbon (TOC), a gross organic term, by five different types of soil admixtures are nonlinear. The soil specimen with more organoclays exhibits higher organic sorption capacity and a larger retardation factor. The specimens with 20% by dry weight of bentonite have higher optimum water content and plasticity. With the addition of bentonite in the soil material consisting of completely decomposed volcanic rock (CDV) (natural soils) and organoclays, the hydraulic conductivity to leachate decreases from about 10−7 to 10−8 cm/s. This indicates that the presence of bentonite in the admixtures is important in reducing hydraulic conductivity.
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References
1.
Anderson, D. C., Crawley, W., and Zabcik, D. ( 1985). “Conductivity of compacted clay soils to water and organic liquids.” Waste Mgmt. and Res., 3, 339–349.
2.
ASTM. ( 1997). “Annual book of ASTM standards,” 04.08, 04.09, West Conshohocken, Pa.
3.
Budhu, M., Giese, R. F., and van Oss, C. (1997). “Surface thermodynamics and some engineering properties of an organo-clay.”J. Geotech. and Geoenvir. Engrg., ASCE, 123(6), 580–587.
4.
Geoguide 3. ( 1988). “Guide to rock and soil descriptions,” Geotechnical Control Office, Civil Engineering Services Department, Hong Kong.
5.
Gregg, S. J., and Sing, K. S. W. ( 1982). Adsorption, surface area, and porosity, Academic Press, San Diego.
6.
Lo, I. M.-C. (1996). “Waste Using Organic-Clay Complex.”J. Envir. Engrg., ASCE, 122(9), 850–855.
7.
Lo, I. M.-C., Liljestrand, H. M., and Daniel, E. D. ( 1994). “Hydraulic conductivity and adsorption parameters for pollutant transport through montmorillonite and modified montmorillonite clay liner materials.” ASTM Special Technical Publication, 1142, 422–438.
8.
Lo, I. M.-C., Mak, R. K.-M., and Lee, S. C.-H. (1997). “Modified clays for waste containment and pollutant attenuation.”J. Envir. Engrg., ASCE, 123(1), 25–32.
9.
Lo, I. M.-C. and Yang, X. Y. (2001). “Use of organoclay as secondary containment for gasoline storage tanks.”J. Envir. Engrg., ASCE, 127(2), 154–161.
10.
Mortland, M. M., Shaobai, S., and Boyd, S. A. ( 1986). “Clay-organic complexes as adsorbents for phenol and chlorophenols.” Clay and Clay Minerals, 34, 581–585.
11.
Shackelford, C. D. ( 1988). “Diffusion of inorganic chemical wastes in compacted clay.” PhD thesis, University of Texas at Austin, Texas.
12.
Smith, J. A., and Jaffe, P. R. ( 1991). “Comparison of tetrachloromethane sorption to an alkylammonium-clay and an alkldiammonium-clay.” Envir. Sci. and Technol., 25, 2054–2058.
13.
U.S. Navy. ( 1982). “Foundation and earth structures.” Design Manual 7.2, NAV-FAC DM 7.2, Naval Fac. Engrg. Command, Alexandria, Va., 2–39.
14.
Xu, S., and Boyd, S. A. ( 1995). “Cationic surfactant sorption to a vermiculitic subsoil via hydrophobic bonding.” Envir. Sci. and Technol., 29, 312–320.
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Received: Mar 22, 2000
Published online: Aug 1, 2001
Published in print: Aug 2001
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