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Sorption and Leaching Characteristics of Diesel-Contaminated Soils Treated by Cold Mix Asphalt  

Seo Jin-Kwon (Department of Civil Engineering, Hanyang University)
Hwang Inseong (Department of Environmental Engineering, Pusan National University)
Park Joo-Yang (Department of Civil Engineering, Hanyang University)
Publication Information
Journal of Soil and Groundwater Environment / v.9, no.4, 2004 , pp. 24-31 More about this Journal
Abstract
A cold mix asphalt (CMA) treatment process was proposed as a tool to recycle soils contaminated with petroleum hydrocarbons. Experimental studies were conducted to characterize performances of the CMA process in treating soils contaminated with diesel or diesel compounds. From the screening experiments, it was found that performances of five types of asphalt emulsions that contained a cationic or an anionic or a nonionic surfactant were not substantially different. In consideration of higher affinity for soils and higher sorption coefficients obtained, an emulsion containing Lauryl Dimethyl Benzyl Ammonium Chloride (LDBAC) was selected as a promising asphalt emulsion for treating diesel-contaminated soils. When the asphalt emulsion LDBAC was applied to treat three compounds that originated from diesel, the removal efficiencies obtained in the order of decreasing efficiencies were as follows: docosane > pentadecane > undecane. Leaching experiments on the specimen formulated by the emulsion LDBAC found that the selected treatment method could treat soils with diesel concentrations as high as 10,000 mg/kg. Leaching of the diesel from the specimen was controlled by diffusion for the first four days and then leaching rate diminished substantially. The latter behavior was characterized as depletion, which represents that the contaminant released amounts to more than $50\%$ of the total amount of the contaminant that can be leached. The amounts of three diesel compounds leached from the specimen in the order of decreasing amount were undecane, pentadecane, and docosane. The curing of the soil contaminated with pentadecane was relatively slow.
Keywords
Cold Mix Asphalt; asphalt emulsion; diesel; undecane; pentadecane; docosane; surfactant; linear sorption; leaching;
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