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Environmental Engineering Research 2010;15(2): 57-62. DOI: https://doi.org/10.4491/eer.2010.15.2.057
Effect of Mixing Methods on the Biodegradation of Sorbed Naphthalene and Phenanthrene in Soils
Hae-Young Kim1, Deok Hyun Moon2, Seon-Yong Chung1, and Jeong-Hun Park1
1Department of Environmental Engineering, Chonnam National University, Gwangju 500-757, Korea
2Department of Environmental Engineering, Chosun University, Gwangju 501-759, Korea
Corresponding Author: Jeong-Hun Park ,Tel: +82-62-530-1855, Fax: +82-62-530-0856, Email: parkjeo1@chonnam.ac.kr
Received: March 17, 2009;  Accepted: February 19, 2010.
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ABSTRACT
The purpose of this study was to investigate the effect of mixing methods on the biodegradation of sorbed naphthalene and phenanthrene in soils. Biodegradation was initiated by inoculating Pseudomonas sp. KM1 into equilibrated soil slurry vials. Four different mixing methods, including no mixing, orbital shaking, rolling and rotating were utilized to enhance the biodegradation of both naphthalene and phenanthrene. The experimental results showed that the sorbed compounds were more effectively biodegraded with rolling and rotating mixing methods. The sorbed naphthalene concentrations were reduced to 0 mg/kg via the rolling and rotating methods. However, with no mixing and the orbital shaking methods, the sorbed naphthalene concentrations were comparatively high, ranging from 2.59 to 20.45 mg/kg. Similar trends were observed for the biodegradation of phenanthrene, but the concentrations remaining were higher than those of naphthalene, due to the limited bioavailability of the sorbed phenanthrene. The rolling and rotating mixing methods are suggested can distribute bacteria uniformly in the slurry system; improve the mass transfer rate and the probability of physical contact between bacteria and the sorbed contaminants, resulting in higher bioavailability of the contaminants.
Keywords: Mixing effects | Biodegradation | Naphthalene | Phenanthrene | Soils
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