HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Rakhshandehroo, G. R. Articles by Boyd, S. A. Search for Related Content PubMed Articles by Rakhshandehroo, G. R. Articles by Boyd, S. A. GeoRef GeoRef Citation Agricola Articles by Rakhshandehroo, G. R. Articles by Boyd, S. A.

Hydraulic Characteristics of Organomodified Soils for Use in Sorptive Zone Applications

Dep. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI 48824

Stephen A. Boyd

Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824

*Corresponding author (voice{at}egr.msu.edu).

ABSTRACT

The sorption capabilities of subsoils for organic contaminants can be enhanced by modification of soil clays with cationic surfactants. The use of these organomodified soils to establish permeable sorptive zones has been suggested as a potential means for attenuating the migration of contaminant plumes. The hydraulic feasibility of sorptive zones was evaluated by measuring the hydraulic conductivities and porosities of both modified and unmodified soils at different effective stresses when permeated with water. Samples with 6, 12, 18, and 24% fines content were prepared and batch treated with hexadecyltrimethylammonium (HDTMA) to 80% of their cation-exchange capacities. Under the first load (24 kPa), all treated soils showed higher conductivities and similar or higher porosities than untreated ones. Higher loads decreased the difference in porosity between treated and untreated soils while increasing the difference between their conductivities. At the highest load (766 kPa), treated samples were 5 to 124 times more conductive than untreated ones depending on their clay contents. Differences in conductivities were explained in terms of the role of treated and untreated clays in controlling initial effective pore size and its change during consolidation. Creation of organomodified sorptive zones by batch soil processing is shown to be hydraulically feasible as evidenced by a marked increase in the conductivities of all treated samples compared with untreated ones. In addition, an increase in the sorptive capacity of the zone could potentially be achieved, without experiencing a loss in conductivity, by increasing the clay content during modification.

Received for publication January 27, 1997.

This article has been cited by other articles:

				W. P. Gates, W. P. Gates, A. Nefiodovas, and P. Peter PERMEABILITY OF AN ORGANO-MODIFIED BENTONITE TO ETHANOL-WATER SOLUTIONS Clays and Clay Minerals, April 1, 2004; 52(2): 192 - 203. [Abstract] [Full Text] [PDF]

				G. Sheng, G. Sheng, and S. A. Boyd POLARITY EFFECT ON DICHLOROBENZENE SORPTION BY HEXADECYLTRIMETHYLAMMONIUM-EXCHANGED CLAYS Clays and Clay Minerals, February 1, 2000; 48(1): 43 - 50. [Abstract] [Full Text] [PDF]