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Published online 17 May 2007
Published in Vadose Zone J 6:413-422 (2007)
DOI: 10.2136/vzj2006.0047
© 2007 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Physical Modeling of LNAPL Source Zone Remediation by Air Sparging

W. A. P. Wadugea, K. Sogab,* and J. Kawabatac

a Arcadis Geraghty & Miller International Ltd., Newmarket, UK
b Univ. of Cambridge, Department of Engineering, Cambridge, UK
c Kajima Technical Research Inst., Tokyo, Japan

Figure 1
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  		FIG. 1. Schematic of air sparging column apparatus. (CT = column test.)

 

Figure 2
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  		FIG. 2. Set-up of the two-dimensional air sparging/soil vapor extraction system.

 

Figure 3
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  		FIG. 3. Soil models and final toluene distribution in coarse sand lens (CSL) experiments. (LW: low water table; MW: middle water table; HW: high water table.)

 

Figure 4
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  		FIG. 4. Soil models and final toluene distribution in fine sand lens (FSL) experiments. (LW: low water table; HW: high water table.)

 

Figure 5
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  		FIG. 5. Variation of remaining mass fraction with normalized injected air volume for different amounts of toluene. The arrows indicate when the flow interruption was performed. The legends describe the flow rate as well as whether the nonaqueous phase liquid (NAPL) was "above" or "below" the water table. "-cont" indicates continuous air injection.

 

Figure 6
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  		FIG. 6. Variation of fractional mass removal with light nonaqueous phase liquid (LNAPL) saturation.

 

Figure 7
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  		FIG. 7. Variation of fractional mass removal in tank experiments.

 

Figure 8
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  		FIG. 8. Variation of toluene gas concentration at extraction well. The arrows indicate when the flow interruption was performed.

 

Figure 9
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  		FIG. 9. Variation of concentration increment with the amount of toluene left in the soil model in tank experiments. (CSL = coarse sand lens; FSL = fine sand lens; LW: low water table; MW: middle water table; HW: high water table.)

 




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