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Enhanced Bioslurping System for Remediation of Petroleum Contaminated Soils  

Kim Dae-Eun (Department of Chemical Engineering, Hanyang University)
Seo Seung-Won (Department of Chemical Engineering, Hanyang University)
Kim Min-Kyoung (Department of Chemical Engineering, Hanyang University)
Kong Sung-Ho (Department of Chemical Engineering, Hanyang University)
Publication Information
Journal of Soil and Groundwater Environment / v.10, no.2, 2005 , pp. 35-43 More about this Journal
Abstract
Bioslurping combines the three remedial approaches of bioventing, vacuum-enhanced free-product recovery, and soil vapor extraction. Bioslurping is less effective in tight (low-permeability) soils. The greatest limitation to air permeability is excessive soil moisture. Optimum soil moisture is very soil-specific. Too much moisture can reduce air permeability of the soil and decrease its oxygen transfer capability. Too little moisture will inhibit microbial activity. So Modified Fenton reaction as chemical treatment which can overcome the weakness of Bioslurping was experimented for simultaneous treatment. Although the diesel removal efficiency of SVE process increased in proportion to applied vacuum pressure, SVE process was difficulty to remediation quickly semi- or non-volatile compounds absorbed soil strongly. And SVE process had variation of efficiency with distance from the extraction well and depth a air flow form of hemisphere centering around the well. Below 0.1 % hydrogen peroxide shows the potential of using hydrogen peroxide as oxygen source but the co-oxidation of chemical and biological treatment was impossible because of the low efficiency of Modified Fenton reaction at 0.1 % (wt) hydrogen peroxide. NTA was more efficiency than EDTA as chelating agent and diesel removal efficiency of Modified Fenton reaction increased in proportion to hydrogen peroxide concentration. Hexadecane as typical aliphatic compound was removed less than Toluene as aromatic compound because of its structural stability in Modified Fenton reaction. What minimum 10% hydrogen peroxide concentration has good remediation efficiency of diesel contaminated groundwater may show the potential use of Modified Fenton reaction after bioslurping treatment.
Keywords
Bioslurping; Modified Fenton reaction; Hydrogen Peroxide; Diesel; Soil;
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