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Efficient Remediation of Petroleum Hydrocarbon-Contaminated Soils through Sequential Fenton Oxidation and Biological Treatment Processes  

Bae, Jae-Sang (Department of Environmental Engineering, Korea Maritime University)
Kim, Jong-Hyang (Institute of Health & Environment at Gyeongnam Provincial Government)
Choi, Jung-Hye (Department of Environmental Engineering, Korea Maritime University)
Ekpeghere, Kalu I. (Department of Environmental Engineering, Korea Maritime University)
Kim, Soo-Gon (QENSolution, Inc.)
Koh, Sung-Cheol (Department of Environmental Engineering, Korea Maritime University)
Publication Information
Korean Journal of Microbiology / v.47, no.4, 2011 , pp. 356-363 More about this Journal
Abstract
The accidental releases of total petroleum hydrocarbons (TPH) due to oil spills frequently ended up with soil and ground water pollution. TPH may be degraded through physicochemical and biological processes in the environment but with relatively slow rates. In this study an attempt has been made to develop an integrated chemical and biological treatment technology in order to establish an efficient and environment-friendly restoration technology for the TPH contaminated soils. A Fenton-like reaction was employed as a preceding chemical treatment process and a bioaugmentation process utilizing a diesel fuel degrader consortium was subsequently applied as a biological treatment process. An efficient chemical removal of TPH from soils occurred when the surfactant OP-10S (0.05%) and oxidants ($FeSO_4$ 4%, and $H_2O_2$ 5%) were used. Bioaugmentation of the degrader consortium into the soil slurry led to an increase in their population density at least two orders of magnitude, indicating a good survival of the degradative populations in the contaminated soils ($10^8-10^9$ CFU/g slurry). TPH removal efficiencies for the Fenton-treated soils increased by at least 57% when the soils were subjected to bioaugmentation of the degradative consortium. However, relatively lower TPH treatment efficiencies (79-83%) have been observed in the soils treated with Fenton and the degraders as opposed to the control (95%) that was left with no treatment. This appeared to be due to the presence of free radicals and other oxidative products generated during the Fenton treatment which might inhibit their degradation activity. The findings in this study will contribute to development of efficient bioremediation treatment technologies for TPH-contaminated soils and sediments in the environment.
Keywords
bioaugmentation; diesel fuel; Fenton oxidation; polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE); total petroleum hydrocarbons (TPH);
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Times Cited By KSCI : 2  (Citation Analysis)
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