• 제목/요약/키워드: Microstreaming

검색결과 5건 처리시간 0.032초

디젤오염토양 복원 효율 증진을 위한 음이온/비이온 계면활성제 토양세척공정에 초음파 적용 영향 (The Effect of Ultrasound Application to Anionic/Non-ionic Surfactant Aided Soil-washing Process for Enhancing Diesel Contaminated Soils Remediation)

  • 조상현;손영규;남상건;최명찬;김지형
    • 한국환경과학회지
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    • 제19권2호
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    • pp.247-254
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    • 2010
  • 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.