Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
권호 표지

Effective Biodegradation of Polyaromatic Hydrocarbons Through Pretreatment Using $TiO_2$-Coated Bamboo Activated Carbon and UV

$TiO_2$로 코팅된 대나무숯 및 UV의 전처리를 통한 다환방향족탄화수소의 효율적 생분해

  • Ekpeghere, Kalu I. (Department of Environmental Engineering, Korea Maritime University) ;
  • Koo, Jin-Heui (Division of Marine Equipment Engineering, Korea Maritime University) ;
  • Kim, Jong-Hyang (Institute of Health & Environment at Gyeongnam Provincial Government) ;
  • Lee, Byeong-Woo (Division of Marine Equipment Engineering, Korea Maritime University) ;
  • Yi, Sam-Nyung (Department of Nano Semiconductor Engineering, Korea Maritime University) ;
  • Kim, Yun-Hae (Division of Marine Equipment Engineering, Korea Maritime University) ;
  • Koh, Sung-Cheol (Department of Environmental Engineering, Korea Maritime University)
  • ;
  • 구진희 (한국해양대 조선기자재공학부) ;
  • 김종향 (경남보건환경연구원) ;
  • 이병우 (한국해양대 조선기자재공학부) ;
  • 이삼녕 (한국해양대 나노반도체공학과) ;
  • 김윤해 (한국해양대 조선기자재공학부) ;
  • 고성철 (한국해양대 환경공학과)
  • Received : 2011.06.14
  • Accepted : 2011.06.28
  • Published : 2011.06.30
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Abstract

$TiO_2$-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 $TiO_2$ 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 ${\mu}g$/L) after the same treatment. On the other hand, the overall concentrations of PAHs became lower than 340 ${\mu}g$/L when the pretreated PAHs were subjected to biodegradation by a PAH-degrading consortium for a week. Herein, phenanthrene, anthracene, fluoranthene, and pyrene were removed by 29.3, 61.4, 27.0, and 44.3%, respectively, indicating the facilitated potential biodegradation of PAHs. Activated carbon coated with $TiO_2$ 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 $TiO_2$-coated bamboo AC. It was proposed that an effective remediation technology for the recalcitrant PAHs could be developed when an optimum pretreatment process is further established.

대나무 활성탄에 $TiO_2$의 코팅을 실시하여 이를 광촉매조건에서 16종의 주요 PAHs를 전처리하고 이를 PAHs 분해미생물에 의한 생분해과정에 적용하여 보다 효율적인 PAHs 처리 기술을 개발하고자 하였다. 대나무 활성탄에 anatase $TiO_2$의 성공적인 코팅이 가능하였으며 이를 이용한 메틸렌블루 용액의 광분해도 측정한 결과 $TiO_2$/AC 촉매가 첨가된 경우 가장 높은 촉매능을 보였다. PAHs 분해미생물이 없는 상태에서 naphthalene, acenaphthylene, acenaphthene 및 fluorene의 경우 각각 9.8, 76.2, 74.1 및 40.5%의 제거효율을 나타내었으나 고분자 PAHs는 $TiO_2$ 처리구에서 높은 잔류농도(400-1,000 ${\mu}g$/L)를 나타내었다. 한편 위의 전처리조건을 거친 후 분해미생물을 1주일간 처리할 경우 전반적인 PAHs가 340 ${\mu}g$/L 이하의 낮은 농도를 나타내었다. 여기서 phenanthrene, anthracene, fluoranthene 및 pyrene은 $TiO_2$의 처리구의 경우 대조구에 비해 각각 29.3, 61.4, 27.0 및 44.3%의 제거율을 나타내었다. $TiO_2$를 AC에 침착한 경우는 분해미생물이 AC 표면에 거의 생물막을 형성하지 못하는 모습이 관찰되었다. 따라서 $TiO_2$를 처리할 경우 분해미생물은 주로 부유상태(planktonic status)에서 PAHs를 분해하는 것으로 사료된다. 향후 보다 적절한 전처리조건을 확립할 경우 보다 효율적인 난분해성의 PAHs 처리기술의 개발이 가능할 것으로 전망된다.

Keywords

References

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