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P47EFFECT OF AIR SPARGING ON FATE AND TRANSPORT OF TRICHLOROETHYLENE IN CHAMBERS WITH ALFALFA PLANTS |
Q. Zhang1, L.E. Erickson1, and L.C. Davis2, 1Chemical Engineering and 2Biochemistry, Kansas State University, Manhattan, KS 66506 |
To study the effect of air sparging in soil with trichloroethylene present as a dense nonaqueous phase, air was supplied through pipes installed at the bottoms of two chambers planted with alfalfa. Air input rate was 2.14 L/m2/day. The fate of trichloroethylene (TCE) was investigated by monitoring concentration in both outflow ground water phase and above soil gas phase.
Experimental results are presented. Comparison of these results with those of our previous study without air introduction indicates that air sparging appreciably increases the ground water concentration. The above soil gas phase shows even greater concentration difference. The flux rate from soil is increased significantly. Accordingly, we can conclude that air sparging improved mass transfer of TCE from nonaqueous phase to ground water phase. Air sparging appeared to negatively impact the health of the alfalfa because of the elevated TCE present in the vadose zone of the chamber. Key words: air sparging, trichloroethylene, ground water, vegetation
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