Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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A Study on Removal of Heavy Metals (Cu, Zn, and Pb) from Contaminated Soil by Soil Washing

토양세척에 의한 오염토양의 중금속(Cu, Zn, Pb) 제거에 관한 연구

  • Kim, Myoung-Jin (Department of Convergence Study on the Ocean Science and Technology, School of Ocean Science and Technology, Department of Environmental Engineering, College of Engineering, Korea Maritime and Ocean University)
  • 김명진 (한국해양대학교 해양과학기술전문대학원 해양과학기술융합학과, 공과대학 환경공학과)
  • Received : 2013.10.16
  • Accepted : 2013.12.15
  • Published : 2013.12.28
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Abstract

In this study, heavy metals are removed by soil washing from soils contaminated with Cu, Zn, and Pb, whose maximum concentrations are up to 3350, 1220, and 2240 mg/kg, respectively. Through various soil washing experiments, the optimum conditions, including type and concentration of washing reagent, washing time, mixing ratio of soil and washing reagent, and stirring speed, are derived for effective removal of the heavy metals. It is found that the most effective washing reagent and its concentration are hydrochloric acid and 50 mM, respectively. The most suitable washing time is 30 minutes and the optimal mixing ratio of soil and washing reagent is 1:30 (g/mL). The removal efficiency, on the other hand, is not affected by stirring speed. The removal efficiencies of the heavy metals decrease when washing reagent is reused. Furthermore, the heavy metals are readsorbed onto soil in case of consecutive reuse of washing reagent.

본 연구에서는 Cu, Zn, Pb 총함량이 각각 최고 3350, 1220, 2240 mg/kg에 이를 정도로 높은 오염토양을 토양세척에 의해 처리하여 해당 중금속을 제거하였다. 중금속 제거효율에 영향을 미치는 중요 인자인 세척제의 종류와 농도, 세척시간, 오염토양과 세척제의 혼합비, 교반속도 등의 최적조건을 도출하였다. 세 가지 중금속을 효과적으로 제거하는 최적 세척제는 50 mM 염산, 세척시간은 30분, 오염토양과 세척제의 혼합비는 1:30 (g/mL)이었으며, 교반속도는 중금속 제거효율에 영향을 미치지 않았다. 세척제인 염산을 재사용하면 중금속 제거효율이 감소했고, 연속적으로 재사용하면 중금속이 토양에 재흡착되었다.

Keywords

References

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