• Influence of LNAPL and Soil Water on Migration of Gaseous Ozone in Unsaturated Soils
  • Jung, Hae-Ryong;Choi, Hee-Chul;
  • Dept. of Environ. Sci. & Eng., Gwangju Institute of Science and Technology;Dept. of Environ. Sci. & Eng., Gwangju Institute of Science and Technology;
  • 불포화 토양내에서 가스상 오존 이동특성에 대한 LNAPL과 토양수분의 영향
  • 정해룡;최희철;
  • 광주과학기술원 환경공학과;광주과학기술원 환경공학과;
Abstract
Laboratory scale experiments were carried out to delineate the effects of liquid phases, such as soil water and light nonaqeous phase liquid (LNAPL) on the transport of gaseous ozone in unsaturated soil. Soil water enhanced the transport of ozone due to water film effect, which prevents direct reaction between soil particles and gaseous ozone, and increased water content reduced the breakthrough time of ozone because of increased average linear velocity and decreased air-water interface area. Diesel fuel as LNAPL also played a similar role with water film, so the breakthrough time of ozone in diesel-contaminated soil was significantly reduced compared with uncontaminated soil. Ozone breakthrough time was retarded with increased diesel concentration, however, because of high reactivity of diesel fuel with ozone. In unsaturated soil containing two liquids of soil water and LNAPL, the transport of ozone was mainly influenced by nonwetting fluid, diesel fuel in this study.

불포화 토양내에서 가스상 오존의 이동특성에 대한 토양수분과 Light non-aqueous phase liquid (LNAPL)의 영향을 알아보기 토양칼럼실험을 실시하였다 토양수분은 토양입자에 수막을 형성하여 가스상 오존과 토양입자의 직접적인 접촉을 방해하여 오존의 이동을 증가시키는 역할을 하였다. 토양수분이 증가할수록 불포화 토양내의 기-액 접촉면적 감소와 오존의 평균선형유속증가로 인해 오존의 이동속도가 증가하였다. LNAPL로 사용된 디젤유의 경우도 토양 표면에 막(Film)을 형성하여 가스상 오존의 이동을 증가시키는 역할을 하였다. 하지만, 토양 수분과는 반대로 디젤유 농도가 증가할수록 오존의 이동속도는 감소하였다. 토양수분과 LNAPL성분이 동시에 존재할 경우에는 토양입자에 Non-wetting유체로 작용하는 LNAPL에 의해 오존의 이동이 영향을 받는다는 것을 알 수 있었다

Keywords: In-Situ chemical oxidation;Ozonation;LNAPL;Soil water;Unsaturated Soil.;

Keywords: 지중화학적산화;오존처리;토양수분;불포화 토양;

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This Article

  • 2005; 10(6): 63-67

    Published on Dec 1, 2005