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Effect of Water Content on the Behavior of Surfactants and Hydrophobic Organic Compounds in the Immobilization Zone for Contaminants Retardation
Jong Soo Cho
Jae-Woo Park
Inseong Hwang
In-Sun Park
出版
United States. Department of Energy. Environmental Management Science Program
, 2003
URL
http://books.google.com.hk/books?id=ndoCkAEACAAJ&hl=&source=gbs_api
註釋
An immobilization zone can be constructed by modifying soils in the vadose zone with surfactants and, thus, can be used to promote retardation of organic contaminants in the subsurface. Column experiments were conducted to investigate the behavior of surfactants and organic contaminants in unsaturated and saturated conditions with different water contents (25%, 50%, 75%, 100%). The transport and sorption behavior of two surfactants tested (monoalkylated disulfonated diphenyl oxide, dialkylated disulfonated diphenyl oxide) in the columns containing an aluminum oxide were similar under the conditions with different water contents. However, transport of a model organic compound (naphthalene) was retarded as the water content decreased by enhanced partitioning of the compound into the surfactants that were sorbed on the aluminum oxide. This suggests that the immobilization method could well be applied to vadose zone. A transport model, CXTFIT 2.1, was also used to evaluate the behavior of the surfactants and naphthalene.