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Heavy Metal Removal Efficiency in Accordance with Changes in Acid Concentrations in a Micro-nano Bubble Soil Washing System and Pickling Process

마이크로나노버블 토양세척시스템 및 산세척 복합공정의 산 농도변화에 따른 중금속 제거효율에 관한 연구

  • Jung, Jin-Hee (Department of Environmental Engineering, Dong-A University) ;
  • Choi, Ho-Eun (Daehan Environment(Co)) ;
  • Jung, Byung-Gil (Department of Environmental Engineering, Dong-Eui University) ;
  • Sung, Nak-Chang (Department of Environmental Engineering, Dong-A University) ;
  • Yi, Gi-Chul (Department of Landscape Architecture, Dong-A University) ;
  • Choi, Young-Ik (Department of Environmental Engineering, Dong-A University)
  • Received : 2016.06.23
  • Accepted : 2016.09.02
  • Published : 2017.01.31

Abstract

This study was aimed at determining the changes in heavy metal removal efficiency at different acid concentrations in a micro-nanobubble soil washing system and pickling process that is used to dispose of heavy metals. For this purpose, the initial and final heavy metal concentrations were measured to calculate the heavy metal removal efficiency 5, 10, 20, 30, 60, and 120 min into the experiment. Soil contaminated by heavy metals and extracted from 0~15 cm below the surface of a vehicle junkyard in the city of U was used in the experiment. The extracted soil was air-dried for 24 h, after which a No. 10 (2 mm) was used as a filter to remove large particles and other substances from the soil as well as to even out the samples. As for the operating conditions, the air inflow rate in the micro-nano bubble soil washing system was fixed at 2 L/min,; with the concentration of hydrogen peroxide being adjusted to 5%, 10%, or 15%. The treatment lasted 120 min. The results showed that when the concentration of hydrogen peroxide was 5%, the efficiency of Zn removal was 27.4%, whereas those of Ni and Pb were 28.7% and 22.8%, respectively. When the concentration of hydrogen peroxide was 10%, the efficiency of Zn removal was 38.7%, whereas those of Ni and Pb were 42.6% and 28.6%, respectively. When the concentration of hydrogen peroxide was 15%, the efficiency of Zn removal was 49.7%, whereas those of Ni and Pb were 57.1% and 42.6%, respectively. Therefore, the efficiency of removal of all three heavy metals was the highest when the hydrogen peroxide concentration was 15%.

Keywords

Zn;Ni;Pb;Micro-nano bubble soil washing system

Acknowledgement

Supported by : 동아대학교

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