Volume 36 Issue 4
Jul.  2011
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Article Navigation >  Earth Science  > 2011  >  36(4): 765-770
LIANG Chun, ZHENG Xi-lai, ZHANG Jun-jie, 2011. Characteristics of Wettability Variation of Oil-Contaminated Porous Medium. Earth Science, 36(4): 765-770. doi: 10.3799/dqkx.2011.078
Citation: LIANG Chun, ZHENG Xi-lai, ZHANG Jun-jie, 2011. Characteristics of Wettability Variation of Oil-Contaminated Porous Medium. Earth Science, 36(4): 765-770. doi: 10.3799/dqkx.2011.078
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Characteristics of Wettability Variation of Oil-Contaminated Porous Medium

doi: 10.3799/dqkx.2011.078

  • Key Laboratory of Ocean Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China

  • Received Date: 2010-11-09
  • Publish Date: 2011-07-01
    Abstract
  • A certain degree of oil pollution can lead to wettability variation in porous medium, which can bring about low water-holding capacity, oil contamination of groundwater, low food quality and production. In this study, water repellency of sand and clay was measured by WDPT and MED methods under different diesel and engine oil contents. Critical oil content of porous media in oil-contaminated porous media was determined preliminarily, beyond which hydrophilic surface could change into hydrophobic surface. The results show that critical oil contents of clay and sand contaminated by engine oil are about 7% and 0.5% respectively. Critical oil content of sand contaminated by diesel is about 14%, while diesel doesn't have remarkable effect on water repellency. In addition, when water content increases to a critical value, wettability of oil-contaminated porous medium will reverse again. Critical water contents of sand contaminated by engine oil and diesel are both between 0.2%-1%, while critical water content of clay contaminated by engine oil is approximately equal to its oil content in value.

     

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