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Air-sparging Technology for Remediation of Specific Aquifer Layer Using Surfactant  

Kim, Heon-Ki (Dept. of Environmental Sciences and Biotechnology, Hallym University)
Song, Young-Su (Dept. of Environmental Sciences and Biotechnology, Hallym University)
Kwon, Han-Joon (Dept. of Environmental Sciences and Biotechnology, Hallym University)
Publication Information
Journal of Soil and Groundwater Environment / v.13, no.6, 2008 , pp. 23-30 More about this Journal
Abstract
Air sparging technique has been used for remediation of VOC(volatile organic compound)-contaminated aquifer. The aim of this study was to develop an innovative air sparging technique that enhances the efficiency of air intrusion into a specific horizontal layer of aquifer where the contaminants exist with the help of water-soluble surfactant. A twodimensional physical box model, packed with homogeneous sand, was used for simulating the aquifer in this study. Aqueous solution of anionic surfactant (100 mg/L, sodium dodecylbenzene sulfonate) was used to suppress the surface tension of groundwater. Three sets of experiments were conducted: air sparging experiment without surfactant application, air sparging experiments for box model where the surfactant solution was applied right above the air injection point, and air sparging experiments with surfactant solution layer formed in the middle of the box. It was found that the sparging influence zone was expanded up to five times of that formed by sparging without surfactant application. The size of sparging influence zone was more sensitive to the air flow (injection) rate with surfactant application than that without surfactant. More importantly, injection of air into the target aquifer layer was successful with surfactant application. Findings in this study are expected to provide more options for designing remediation processes using air sparging.
Keywords
Groundwater; Remediation; Pollution; Surfactant; Sparging; VOC;
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