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Titolo:
Hydraulic conductivities of cationic surfactant modified soil mixtures
Autore:
Rakhshandehroo, GR; Wallace, RB; Zhao, XD; Boyd, SA; Voice, TC;
Indirizzi:
Shiraz Univ, Dept Civil Engn, Shiraz, Iran Shiraz Univ Shiraz IranShiraz Univ, Dept Civil Engn, Shiraz, Iran Michigan State Univ, Dept Civil & Environm Engn, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 Engn, E Lansing, MI 48824 USA Michigan State Univ, Dept Crop & Soil Sci, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 l Sci, E Lansing, MI 48824 USA
Titolo Testata:
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE
fascicolo: 8, volume: 127, anno: 2001,
pagine: 724 - 729
SICI:
0733-9372(200108)127:8<724:HCOCSM>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC CONTAMINANTS; SUBSOIL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Wallace, RB Shiraz Univ, Dept Civil Engn, Shiraz, Iran Shiraz Univ Shiraz Iran Univ, Dept Civil Engn, Shiraz, Iran
Citazione:
G.R. Rakhshandehroo et al., "Hydraulic conductivities of cationic surfactant modified soil mixtures", J ENV ENG, 127(8), 2001, pp. 724-729

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 hydraulicconductivities 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 andthe kinetics of HDTMA adsorption were evaluated using C-14-labeled HDTMA. Soil suspension turbidity was used to infer the degree of clay dispersion or flocculation; clays were dispersed in O, 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. HDTMAadsorption 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 soilsto 0.7 and 1.0 CEC treatment levels, as compared to untreated soil, under all loads.

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Documento generato il 25/01/20 alle ore 06:25:46