Shin Kyung-Hee, Kim Kyoung-Woong
Advanced Environmental Monitoring Research Center, Kwangju Institute of Science and Technology, Kwangju 500-712, South Korea.
Environ Geochem Health. 2004 Mar;26(1):5-11. doi: 10.1023/b:egah.0000020895.85344.09.
In order to examine the potential of biosurfactants in soil remediation, and to investigate the effects of several operating conditions, such as flow rate, biosurfactant concentration and surfactant type, biosurfactant-enhanced soil flushing was conducted. In the biosurfactant-enhanced soil flushing process, the removal efficiency increased as the flow rate decreased. Rhamnolipid showed no effect on the removal efficiency of phenanthrene and diesel from sand in the concentration range 0.3-0.5%. However, rhamnolipid showed higher efficiencies for the removal of phenanthrene and diesel from sand than Tween 80. Based on total recovery, following an equivalent pore volume flush, it was more difficult to remove diesel than phenanthrene. In order to obtain the specific removal efficiency, more pore volumes of surfactant solution may be required in field applications. Under optimum conditions, the biosurfactant removed as much as 70% of the phenanthrene and 60% of the diesel in the sand. These results indicate that the use of biosurfactants in the flushing process is favorable, not only with respect to the environment, but also on removal efficiencies.
为了研究生物表面活性剂在土壤修复中的潜力，并考察流速、生物表面活性剂浓度和表面活性剂类型等几个操作条件的影响，开展了生物表面活性剂强化土壤冲洗实验。在生物表面活性剂强化土壤冲洗过程中，去除效率随流速降低而提高。在0.3-0.5%的浓度范围内，鼠李糖脂对从沙子中去除菲和柴油的效率没有影响。然而，鼠李糖脂从沙子中去除菲和柴油的效率高于吐温80。基于总回收率，在冲洗等效孔隙体积后，柴油比菲更难去除。为了获得特定的去除效率，在现场应用中可能需要更多孔隙体积的表面活性剂溶液。在最佳条件下，生物表面活性剂可去除沙子中多达70%的菲和60%的柴油。这些结果表明，在冲洗过程中使用生物表面活性剂不仅有利于环境，而且去除效率也很高。
