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Derivation of Optimum Operating Conditions for Electrical Resistance Heating to Enhance the Flushing Effect of Heavy Oil Contaminated Soil

중질유 오염토양의 세정효과를 증진시키기 위한 전기저항가열의 최적 운전조건 도출

  • Lee, Hwan (SG Institute of Environment Science & Technology) ;
  • Jung, Jaeyun (Daeil Engineering and Construction Co., Ltd) ;
  • Kang, Doore (Daeil Engineering and Construction Co., Ltd) ;
  • Lee, Cheolhyo (Daeil Engineering and Construction Co., Ltd)
  • Received : 2020.05.15
  • Accepted : 2020.06.08
  • Published : 2020.06.30

Abstract

This study evaluated the applicability of the convergence technology by deriving the optimum conditions about operating factors of electrical resistance heating to enhance the soil flushing effect on soil contaminated with bunker C oil in the coastal landfill area. As a result of the batch scale experiment, the flushing efficiency of the VG-2020 was higherthan that of the Tween-80, and the flushing efficiency increased by about 1.4 times at 60℃ compared to room temperature. As a result of the electrical resistance heating box experiment, soil temperature rose to 100℃ in about 40~80 minutes in soil with water content of 20~40%, and it was found that the heat transfer efficiency is excellent when the pipe-shaped electrode rod with STS 316 material is located in a triangular arrangement in saturated soil. In addition, it was confirmed that the interval between the electrode rods to maintain the soil temperature above 60℃ under the optimum conditions was 1.5 m, and the soil flushing box experiment accompanying electrical resistance heating showed TPH reduction efficiency of about 55% at 5 Pore Volume, and satisfied the Korean standard for the conservation of soil (less than TPH 2,000 mg/kg) at 10 Pore Volume.

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