Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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The Effect of Ultrasound Application to Anionic/Non-ionic Surfactant Aided Soil-washing Process for Enhancing Diesel Contaminated Soils Remediation

디젤오염토양 복원 효율 증진을 위한 음이온/비이온 계면활성제 토양세척공정에 초음파 적용 영향

  • Cho, Sang-Hyun (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Son, Young-Gyu (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Nam, Sang-Geon (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Cui, Ming-Can (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Khim, Jee-Hyeong (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 조상현 (고려대학교 건축.사회환경공학부) ;
  • 손영규 (고려대학교 건축.사회환경공학부) ;
  • 남상건 (고려대학교 건축.사회환경공학부) ;
  • 최명찬 (고려대학교 건축.사회환경공학부) ;
  • 김지형 (고려대학교 건축.사회환경공학부)
  • Received : 2009.12.28
  • Accepted : 2010.02.02
  • Published : 2010.02.28
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Abstract

Ultrasound and Surfactant aided soil washing process has been shown to be an effective method to remove diesel from soils. The use of surfactants can improve the mobility of diesel in soil-water systems by increasing solubility of adsorbed diesel into surfactant micelles. However, a large amount of surfactant is required for treatment. In addition, synthetic surfactants, specially anionic, are more toxic and the surfactant wastewater is hard to treat by conventional wastewater treatments even by AOPs. Ultrasound improves desorption of the diesel adsorbed on to soil. The mechanisms are based on physical breakage of bonds by hot spot, directly impact onto soil particle surface, the fragmentation of long-chain hydrocarbons by micro-jet and microstreaming in the soil pores. The use of ultrasound as an enhancement method in both anionic and nonionic surfactant aided soil-washing processes were studied. And all experiments were examined proceeded under CMC surfactant concentration, frequency 35 khz, power 400 W, Soil-water ratio 1:3(wt%), particle size 0.24 ~ 2mm and initial diesel concentration. 20,000 mg/kg. Combination with ultrasound showed significant enhancements on all the processes. Especially, nonionic surfactant Triton-X100 with ultrasound showed remarkable enhancements and diesel removal rate enhanced by ultrasound helps desorpting of surfactant adsorbed onto soils which prevented decreasing surfactant activity.

Keywords

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