대한환경공학회지 (Journal of Korean Society of Environmental Engineers)
- 제22권5호
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- Pages.869-877
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- 2000
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- 1225-5025(pISSN)
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- 2383-7810(eISSN)
Ozone에 의한 PAHs 오염토양 복원 연구(I): 토양슬러리상 오존 산화
Ozone Oxidation of PAHs in the Presence of Soil (I): Ozonation of Soil Slurry Phase
- Lim, Hyung-Nam (Dept. of Environmental Science & Engineering, Kwangju Institute of Science & Technology) ;
- Kim, Ji-Yeon (Dept. of Environmental Science & Engineering, Kwangju Institute of Science & Technology) ;
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Choi, Heechul
(Dept. of Environmental Science & Engineering, Kwangju Institute of Science & Technology)
- 투고 : 1999.12.16
- 심사 : 2000.02.25
- 발행 : 2000.05.31
초록
Phenanthrene과 benzo[a]pyrene으로 오염된 토양을 슬러리상에서 오존처리시 반응메커니즘을 조사하였다. 토양내 오존주입시 OH-radical의 생성과 반응에 있어서 유 무기물의 영향을 알아보기 위하여 단순화된 토양매질로써 baked sand(BS), sand(S), glass beads(GB)를 택하여 실험한 결과 제거속도가 BS>S>GB 순으로 나타났다. Radical scavenger 실험을 통하여 OH-radical의 발생경향을 살펴보았는데, BS의 경우 OH-radical의 생성으로 오존과의 직접반응과 더불어 제거효율이 22% 상승됨을 알 수 있었다. Humic acid의 초기농도를 0~5 ppm으로 증가시킴에 따라 반응속도상수(psuedo first-order rate constant:
A mechanism of ozonation of simulated soil slurry contaminated by phenanthrene and benzo[a]pyrene has been studied under various conditions. The effects of soil media(BS, S, GB), radical scavenger, ozone input ratio(0.17~0.73mg/min), bicarbonate ion, and humic acid were investigated, BS showed the highest removal efficiency in media tested. The generation of OH-radical via the catalytic decomposition of ozone on active sites of the natural sand was confirmed by OH-radical scavenger experiments. The enhanced removal efficiency by OH-radical was indirectly quantified to be about 22%. As initial concentration of humic acid(as sodium salt) was increased, pseudo first-order rate constant (