Effect of Surfactant on Solvent Extraction for Light Hydrocarbon from Soils

토양중 Light Hydrocarbon의 용매추출에 미치는 계면활성제의 영향

This study was conducted to evaluate the surfactant solutions which influence solvent extraction from light hydrocarbon contaminated soils. Nine characteristic compounds were studied: benzene, toluene, ethylbenzene, o-xylene, mxylene, p-xylene, n-propylbenzene, 1,2,4-trimethylbenzene, and n-butylbenzene which were found in gasoline. Adsee-799 and Witbreak DRA-22 showed some extractive capacity for light hydrocarbons from soil. There was no added advantage obtained by using other surfactants in this study. No removal of contaminants from soil was observed when the surfactant concentration was 0.5 percent or below. When the surfactant concentration was 4 percent, the average recovery for some hydrocarbons was 10.8 percent, which was the best obtained at these levels. There was 10 percent surfactant contribution for methanol extraction from soil with the Witbreak DPG-482 and Witbreak DRA-22. This study provided a useful screening technique for procedures that can be used to remediate soils contaminated with light hydrocarbons.

본 실험은 light hydrocarbon에 오염된 토양을 용매 추출할 때 계면활성제의 영향을 평가하고자 6가지의 계면활성제 (Witbreak DPG-482, Witbreak DRA-22, Witcomul 4016, Witcolate SL-1, Adsee 799, Triton X-100)와 2가지 용매(물, 메타놀)를 대상으로 실험하였다. Light hydrocarbon으로는 benzene, toluene, ethyl bnzene, o-xylene, m-xylene, p-xylene, n-propyl benzene, 1,2,4-trimethyl benzene, 그리고 n-butyl benzene등 9가지를 대상으로 하였다. 계면활성제중 Adsee-799과 Witbreadk DRA-22가 토양중 light hydrocarbon의 물추출 효율을 다소 증가시키는 것으로 나타나고 있으며, 나머지 계면활성제는 효과가 없었다. 또한 물중의 계면활성제의 농도가 0.5%이하에서는 효과가 없는 것으로 나타나고 있으며, 계면활성제의 농도가 4%일때 평균 10.8%의 추출증가 효과가 있었다. 메타놀을 추출용매로 사용할 때에는 Witbread DPG-782와 Witbreak DRA-22가 약 10%의 추출증가 효과를 나타내고 있었다.