Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
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In-situ biosurfactant flushing, coupled with a highly pressurized air injection, to remediate the bunker oil contaminated site

  • Lee, Min-Hee (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Kim, Jong-Sung (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Kim, In-Su (Department of Earth Environmental Sciences, Pukyong National University)
  • Published : 2011.09.01
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Abstract

A pilot scale test for in-situ biosurfactant flushing coupled with a highly pressurized air injection (HPAI) was performed to remediate a bunker oil contaminated site. The contaminated area was located in Ulsan, Korea, which had been used for a roofing tile manufacturing facility for 25 years. This site was mainly contaminated by the leakage of bunker A- and C-oil from the old underground storage tank (the average TPH concentration of soil was 1,820 mg/kg). A pilot scale test site ($17\;m\;\times\;12\;m\;\times\;4\;m$) was selected in the contaminated area and twelve injection wells and two extraction wells were established at the site. Two percent of biosurfactant solution was flushed into each injection well at 2 L/min, followed by HPAI (20 $kgf/cm^2$) to accelerate the mobility of flushed solution in pore spaces and thus to increase the removal efficiency of in-situ flushing. The process of biosurfactant flushing with HPAI was repeated until about 1.9 pore volumes of biosurfactant solution (350 tons) were flushed at the test site. The effluent solution was gathered and treated by a post treatment process that included a chemical reaction tank. A total of 2.2 ton of TPH (82% of the initial TPH) was removed from the site within 1.9 pore volumes of biosurfactant solution flushing resulting in the average TPH concentration of the residual soil being below 500 mg/kg, suggesting that the in-situ biosurfactant flushing coupled with HPAI, is very useful in remediating bunker oil contaminated sites.

Keywords

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