Hydraulic Conductivities of Cationic Surfactant Modified Soil Mixtures
Publication: Journal of Environmental Engineering
Volume 127, Issue 8
Abstract
Surfactant-enhanced sorbent zones have potential utility for contaminant plume management in the subsurface. Changes in the hydraulic properties associated with the formation of such zones were studied by measuring hydraulic conductivities of sandy-loam soil mixtures with different fine contents (6, 12, 18, and 24%) that were either untreated, or treated in batch systems with hexadecyltrimethylammonium (HDTMA). Experimental conditions included treatment to 0.1, 0.7, 1.0, and 2.3 times the cation exchange capacities (CEC), and effective stresses from 0 to 766 kPa. Achieved treatment levels and the kinetics of HDTMA adsorption were evaluated using 14C-labeled HDTMA. Soil suspension turbidity was used to infer the degree of clay dispersion or flocculation; clays were dispersed in 0, 0.1, and 2.3 CEC treated soils and flocculated in 0.7 and 1.0 CEC treated soils. Consistent with their flocculated clay structures, the 0.7 and 1.0 CEC treated soils showed equal or higher conductivities compared to 0, 0.1, and 2.3 CEC treated soils. The 0.7, 1.0, and 2.3 CEC treated soils also showed higher compressibility. HDTMA adsorption occurred rapidly at levels up to 1.0 CEC but was kinetically limited at the high treatment level (2.3 CEC). Creation of sorbent zones by ex situ batch treatment with cationic surfactants was deemed hydraulically feasible as evidenced by equal or higher conductivity of HDTMA-treated soils to 0.7 and 1.0 CEC treatment levels, as compared to untreated soil, under all loads.
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References
1.
Boyd, S. A., Lee, J. F., and Mortland, M. M. ( 1988). “Attenuating organic contaminant mobility by soil modification.” Nature, 333(6171), 345–347.
2.
Bradford, J. M., and Gupta, S. C. ( 1986). Methods of soil analysis part 1—Physical and mineralogical methods, American Society of Agronomy, and Soil Science Society of American, Madison, WS.
3.
Burris, D. R., and Antworth, C. P. ( 1992). “In situ modification of an aquifer material by a cationic surfactant to enhance retardation of organic contaminants.” J. Contaminant Hydro., 10(4), 325–337.
4.
Crocker, F. H., Guerin, W. F., and Boyd, S. A. ( 1995). “Bioavailability of naphthalene sorbed to cationic surfactant-modified semectite clay.” Envir. Sci. and Technol., 29(12), 2953–2958.
5.
Hayworth, J. S., and Burris, D. R. ( 1997). “Nonionic surfactant-enhanced solubilization and recovery of organic contaminants from within cationic surfactant-enhanced sorbent zones. 1. Experiments.” Envir. Sci. Technol, 31(5), 1277–1283.
6.
Nye, J. V., Guerin, W. F., and Boyd, S. A. ( 1994). “Heterotrophic activity of microorganisms in soils treated with quaternary ammonium-compounds.” Envir. Sci. and Technol., 28(5), 944–951.
7.
Rakhshandehroo, G. R., Wallace, R. B., Boyd, S. A., and Voice, T. C. ( 1998). “Hydraulic characteristics of organomodified soils for use in sorptive zone applications.” Soil Sci. Soc. Am. J., 62(1), 5–12.
8.
Shackelford, C. D. ( 1994). “An conductivity and waste contaminant transport in soil.” ASTM STP 1142, D. E. Daniel and S. J. Trautwein, eds., Philadelphia, 111–168.
9.
Theng, B. K. G. ( 1974). The chemistry of clay organic reactions, Wiley, New York.
10.
Wallace, R. B., Grant, J. M., Voice, T. C., Rakhshandehroo, G. R., Xu, S., and Boyd, S. A. ( 1995). “Hydraulic conductivity of organomodified soil.” ASCE-CSCE Nat. Conf. on Envir. Engrg., ASCE, New York, 92–100.
11.
Xu, S. H., and Boyd, S. A. ( 1994). “Cation-exchange chemistry of hexadecyltrimethylammonium in a subsoil containing vermiculite.” Soil Sci. Soc. Am. J., 58(5), 1382–1391.
12.
Xu, S. H., and Boyd, S. A. ( 1995). “Cationic surfactant sorption to a vermiculitic subsoil via hydrophobic bonding.” Envir. Sci. and Technol., 29(2), 312–320.
13.
Xu, S. H., Sheng, G. Y., and Boyd, S. A. ( 1997). “Use of organoclays in pollution abatement.” Adv. in Agronomy, 59, 25–62.
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Published In
Journal of Environmental Engineering
Volume 127 • Issue 8 • August 2001
Pages: 724 - 729
History
Received: Oct 28, 1999
Published online: Aug 1, 2001
Published in print: Aug 2001
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