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KMID : 0364820110470010137
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Korean Journal of Microbiology
2011 Volume.47 No. 1 p.137 ~ p.142
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Effective Biodegradation of Polyaromatic Hydrocarbons Through Pretreatment Using TiO2-Coated Bamboo Activated Carbon and UV
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Kalu I. Ekpeghere
Koo Jin-heui
Kim Jong-hyang
Lee Byeong-woo
Lee San-nyung
Kim Yun-hae
Koh Sung-cheol
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Abstract
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TiO2-coated bamboo activated carbon has been prepared and utilized under UV irradiation as a pretreatment method for an effective biodegradation of the recalcitrant polyaromatic hydrocarbons (PAHs). The anatase TiO2 was successfully coated on the bamboo activated carbon (AC) and it showed the highest photoactivity against methylene blue. In the absence of the PAHs-degrading bacteria PAHs having low molecular weight (i.e., naphthalene, acenaphthylene, acenaphthene, and fluorene) were degraded by 9.8, 76.2, 74.1, and 40.5%, respectively. Higher molecular weight PAHs, however, maintained high residual concentrations of PAHs (400-1,000 μg/L) after the same treatment. On the other hand, the overall oncentrations of PAHs became lower than 340 μg/L when the pretreated PAHs were subjected to biodegradation by PAH-degrading consortium for a week. Herein, phenanthrene, anthracene, fluoranthene, and pyrene were removed by 29.3, 1.4, 27.0, and 44.3%, respectively, indicating the facilitated potential biodegradation of PAHs. Activated carbon coated with TiO2 appeared to inhibit growth of PAH degraders on the surface of AC, indicating planktonic degraders were dominantly involved in the PAH biodegradation in presence of the TiO2-coated bamboo AC. It was proposed that an effective emediation technology for the recalcitrant PAHs could be developed when an optimum pretreatment process is further stablished.
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KEYWORD
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bamboo activated carbon, biodegradation, PAHs, TiO2, UV irradiation
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