此研究探討表面素(surfactin)的界面性質，包括表面張力下降能力、起泡能力、乳化能力及增溶效率。然後將表面素應用於溶液淋洗(solution flushing)與泡沫強化淋洗(foam-enhanced solution flushing) 技術，以移除填充管柱中的正十五碳烷，並評估將表面素應用於土壤復育的潛力。表面素的臨界微胞濃度大約是2×10-5 M，能使水的表面張力下降到30 mN/m。表面素溶液的起泡能力會隨濃度增加而上升，然而，泡沫穩定性卻隨濃度增加而下降。此外，含表面素之正十五碳烷/水乳液的穩定性，會隨表面素濃度增加而上升。對於正十五碳烷而言，表面素的莫耳溶解比率(molar solubilization ratio, MSR)是0.56。若以濃度1.5×10-4 M的表面素溶液進行淋洗以移除填充管柱中的正十五碳烷，效率約為5%。當使用泡沫強化淋洗方法時，移除正十五碳烷的效率可顯著提升至85%，可能是因為填充管柱中的渠流效應 (channeling effect) 較不明顯。實驗結果顯示對於正十五碳烷的移除而言，增溶效應相對於移動效應(mobilization effect)是較不重要的。此外，在應用泡沫強化淋洗技術時，較高濃度的表面素與較大的氣/液流量比，可得到較高的正十五碳烷移除率。結果也顯示，就移除填充管柱中的正十五碳烷而言，表面素比Triton X-100更具有優勢。

This study investigated the interfacial properties of surfactin, such as surface tension lowering activity, foaming ability and foam stability, emulsification ability, and solubilization efficiency. Surfactin was then used in solution flushing and foam-enhanced solution flushing techniques to remove n-pentadecane from packed columns to evaluate the potential of applying the biosurfactant in soil remediation. The critical micelle concentration of surfactin was about 2×10-5 M, and the surface tension of water could be lowered to 30 mN/m. The foaming ability of the surfactin solutions was enhanced with a higher surfactin concentration. However, the foam stability became lower with increasing the surfactin concentration. In addition, the stability of n-pentadecane/water emulsions was higher with a higher surfactin concentration, and the molar solubilization ratio of surfactin for n-pentadecane was found to be 0.56. The removal efficiency for n-pentadecane from a packed column was about 5% by using the solution flushing technique with a 1.5×10-4 M surfactin solution. The removal efficiency for n-pentadecane was significantly increased to about 85% with the foam-enhanced solution flushing approach probably due to the less pronounced channeling effect in the packed column. It is suggested that the solubilization effect was a less important factor in the n-pentadecane removal as compared with the mobilization effect. Furthermore, with the foam-enhanced solution flushing technique, higher removal efficiency for n-pentadecane was obtained with higher surfactin concentrations and larger gas/liquid flow rate ratios. The results also showed that surfactin has the advantage over Triton X-100 of removing n-pentadecane from the packed columns.

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