Shin Kyung-Hee, Kim Kyoung-Woong, Ahn Yeonghee
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology 1, Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea.
J Hazard Mater. 2006 Oct 11;137(3):1831-7. doi: 10.1016/j.jhazmat.2006.05.025. Epub 2006 May 16.
The applicability of the combined solubilization-biodegradation process was examined using soil-packed column. In the solubilization step, 50 pore volumes of 150 mg/l biosurfactants solution was injected and the percentage removal of phenanthrene (mg) was 17.3% and 9.5% from soil with pH 5 and 7, respectively. The highest solubility was detected at pH 5 and this result confirmed that adjusting the pH of the biosurfactants solution injected could enhance the solubility of phenanthrene. Following this, soil samples were completely transferred to batches and incubated for 10 weeks to monitor phenanthrene degradation. The phenanthrene concentration in the soil samples decreased significantly during the biodegradation step in all soil samples, except for the soil sample that was flushed with biosurfactants solution with pH 4. This indicated that the degradation of contaminants by specific species might not be affected by the residual biosurfactants following application of the solubilization process. Moreover, these results suggested that the biosurfactant-enhanced flushing process could be developed as a useful technology with no negative effects on subsurface environments and could be combined with the biodegradation process to increase the removal efficiency.
使用土壤填充柱研究了增溶 - 生物降解联合工艺的适用性。在增溶步骤中，注入50孔隙体积的150 mg/l生物表面活性剂溶液，在pH值为5和7的土壤中，菲（mg）的去除率分别为17.3%和9.5%。在pH值为5时检测到最高溶解度，这一结果证实，调节注入的生物表面活性剂溶液的pH值可以提高菲的溶解度。在此之后，将土壤样品完全转移到批次中，孵育10周以监测菲的降解。在生物降解步骤中，除了用pH值为4的生物表面活性剂溶液冲洗过的土壤样品外，所有土壤样品中的菲浓度均显著降低。这表明特定物种对污染物的降解可能不受增溶过程后残留生物表面活性剂的影响。此外，这些结果表明，生物表面活性剂强化冲洗工艺可以发展成为一种对地下环境无负面影响的有用技术，并且可以与生物降解工艺相结合以提高去除效率。
