• Mechanism on Extraction of Heavy Metals from Soil by Ultrasonication
  • Shin, Yeon-Jun;Lee, Cha-Dol;Yoo, Jong-Chan;Yan, Jung-Seok;Kim, Ho-Sub;Baek, Kitae;
  • Department of Environmental Engineering, Chonbuk National University;H-Plus Eco LTD.;Department of Environmental Engineering, Chonbuk National University;KIST-Gangeung Institute;KOLON Water&Energy;Department of Environmental Engineering, Chonbuk National University;
  • 초음파 조사에 의한 토양내 중금속 추출 기작 연구
  • 신연준;이차돌;유종찬;양중석;김호섭;백기태;
  • 전북대학교 환경공학과;에이치플러스에코;전북대학교 환경공학과;KIST 강릉분원;코오롱워터앤에너;전북대학교 환경공학과;
Abstract
In this study, the mechanisms on ultrasonication enhanced metals extraction were investigated compared with the conventional washing technique. We hypothesized the mechanisms on enhanced extraction of ultrasonication: ultrasonication increased the temperature of soil slurry and decreased average particle size of soil due to breakdown of soil aggregate. Actually, the ultrasonication increased the temperature of soil slurry to $60^{\circ}C$ in this study, and the increase in the temperature enhanced the metal extraction to 15-20% even in the conventional simple mixing. The conventional washing technique decreased average size of soil particles because of breakdown of soil aggregate, and the ultrasonication decreased the size more than that of washing. The breakdown of soil aggregate improved the contact between metals and washing agent, which enhanced the extraction of metals in the ultrasonication. Therefore, we concluded that the main mechanisms of ultrasonication are increase in the temperature and breakdown of the soil aggregate. Finally, the ultrasonicaiton increased the extractability of metals upto 40% compared to conventional washing technique.

Keywords: Ultrasonication;Metal extraction;Mechanism;Metal-contaminated soil;Sequential extraction;

This Article

  • 2015; 20(1): 28-35

    Published on Feb 28, 2015

  • 10.7857/JSGE.2015.20.1.028
  • Received on Dec 1, 2014
  • Revised on Feb 25, 2015
  • Accepted on Feb 25, 2015

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