Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Bioremediation of Diesel-Contaminated Soils by Natural Attenuation, Biostimulation and Bioaugmentation Employing Rhodococcus sp. EH831

Natural attenuation, biostimulation 및 Rhodococcus sp. EH831을 이용한 bioaugmentation에 의한 디젤 오염 토양의 정화

  • Lee, Eun-Hee (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Kang, Yeon-Sil (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Cho, Kyung-Suk (Department of Environmental Science and Engineering, Ewha Womans University)
  • 이은희 (이화여자대학교 환경공학과) ;
  • 강연실 (이화여자대학교 환경공학과) ;
  • 조경숙 (이화여자대학교 환경공학과)
  • Received : 2011.02.23
  • Accepted : 2011.03.15
  • Published : 2011.03.28
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Abstract

Three bioremediation methods, natural attenuation (NA), biostimulation (BS) and bioaugmentation (BA) were applied to remediate diesel-contaminated soil, with their remediation efficiencies and soil microbial activities compared both with and without surfactant (Tween 80). BA treatment employing Rhodococcus sp. EH831 was the most effective for the remediation of diesel-contaminated soil at initial remediation stage. On the addition of surfactant, no significant effect on the remediation performance was observed. A negative correlation was found between the dehydrogenase activity (DHA) and residual concentration of total petroleum hydrocarbons (TPHs) at below 20,000 mg-$TPHs{\cdot}kg$-dry $soil^{-1}$, as follows: DHA (${\mu}g$-TPF(Triphenylformazan)${\cdot}g$-dry $soil^{-1}\;d^{-1}$) = -0.02 ${\times}$ TPHs concentration (mg-$TPHs{\cdot}kg$-dry $soil^{-1}$) + 425.76 (2500 ${\leq}$ TPHs concentration ${\leq}$ 20000, p < 0.01).

3가지 종류의 생물정화법인 natural attenuation (NA), biostimulation (BS) 및 bioaugmentation (BA) 방법을 디젤로 오염된 토양을 정화하기 위해 적용하여, 각 방법에 의한 정화효율과 미생물 활성을 계면활성제 첨가 유무(Tween 80)에 따라 비교하였다. 토양 정화 초기 단계에서는 Rhodococcus sp. EH831을 접종원으로 이용하는 BA 방법에 의한 토양 정화효율이 가장 좋았다. 3가지 생물정화방법 모두에서 계면활성제 첨가는 토양 정화효율에 영향을 미치지 않았다. 토양의 탈수소활성(DHA)과 잔류 총석유계탄화수소(TPHs) 농도는 음의 상관관계를 보였다: DHA (${\mu}g-TPF{\cdot}g$-dry $soil^{-1}\;d^{-1}$) = -0.02 ${\times}$ TPHs concentration ($mg-TPHs{\cdot}kg$-dry $soil^{-1}$) + 425.76 (2500 ${\leq}$ TPHs concentration ${\leq}$ 20000, p < 0.01).

Keywords

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