Effect of air sparging on fate and transport of trichloroethylene in chambers with alfalfa plants
Conference
·
OSTI ID:585804
- Kansas State Univ., Manhattan, KS (United States)
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 bottom of two chambers planted with alfalfa. Air input rate was 2.14 L/m{sup 2}/day. The fate of trichloroethylene (TCE) was investigated by monitoring TCE concentration in both outflow groundwater and soil gas. Comparison of these results with those of the previous study without air sparging indicates that air sparging appreciably increases the groundwater concentration of TCE. The soil gas at the surface shows even greater concentration difference. The flux of TCE to the atmosphere is increased significantly by air input. Accordingly, the authors can conclude that air sparging improved mass transfer of TCE from the nonaqueous phase to groundwater 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.
- Sponsoring Organization:
- Environmental Protection Agency, Washington, DC (United States)
- OSTI ID:
- 585804
- Report Number(s):
- CONF-9705104--
- Country of Publication:
- United States
- Language:
- English
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