Effect of Air Migration on Recovery of Contaminant Concentration in Groundwater

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  • 地下水へ注入された空気による水質回復の効果について
  • チカスイ エ チュウニュウ サレタ クウキ ニ ヨル スイシツ カイフク ノ

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Abstract

The air sparging coupled with the soil vapor extraction as the physical remediation technologies has been applied to a site contaminated with volatile substances like tetrachloroethylene. The air sparging technology facilitates the contaminant volatilization with air injected into saturated zone and the soil vapor extraction technology extracts the contaminant in soil gas and injected air. Therefore, in order to implement these technologies, it is indispensable to understand the mechanism of air migration injected in groundwater and the change of groundwater concentration. In this paper, we presented the results of full scale field experiment implemented to estimate the recovery of water quality by air injected in groundwater. The summery was follows. It was clarified that injected air spread sufficiently in an experimental site when the pulsed operation for air injection was carried out. The concentration in injected air, which was calculated by the observed data like extracted gas concentration, showed the possibility that there would be the denser-than-water non-aqueous phase liquid in an aquifer. And also, it has been removed with the substances dissolved in groundwater by air injection.

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