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43SURFACTANT ENHANCED SOLUBILIZATION AND MOBILIZATION OF POLYCYCLIC AROMATIC HYDROCARBONS |
X. Sun, M.L. Rueppel, and R.K. Puri, Environmental Trace Substances Research Center, University of Missouri-Rolla, 1870 Minor Circle Drive, Rolla, MO 65409 |
The role of anionic, cationic, and nonionic surfactants was investigated in solubilizing polycyclic aromatic hydrocarbons (PAHs) from soil. The data of the batch experiment showed that Brij 30 (the nonionic surfactant) started transporting the PAHs from soil to water at concentrations well below its apparent critical micelle concentration (ACMC).
The same surfactant showed a great potential in remediation of PAH-contaminated soils. The tested anionic and cationic surfactants did not show solubilization effect until the concentrations reached their ACMCs. A considerable portion of the solubilized PAHs either returned back to soil or suspended in the mobile phase after 170 days depending on the nature and concentration of the surfactants. The decomposition of the surfactants was more significant than that of the PAHs during the length of the experiment. Key words: polycyclic aromatic hydrocarbons, surfactants, fate and transport, solubilization
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