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Remediation of As-contaminated Soil Using Magnetite and Bottom Ash

비소 오염 토양의 복원을 위한 자철석과 바닥재 활용

  • Se Jin Oh (Department of Environmental and Energy Engineering, Yonsei University) ;
  • Min Woo Kang (Department of Environmental and Energy Engineering, Yonsei University) ;
  • Jong Cheol Lee (Department of Environmental and Energy Engineering, Yonsei University) ;
  • Hun Ho Lee (Department of Environmental and Energy Engineering, Yonsei University) ;
  • Hyun-Seog Roh (Department of Environmental and Energy Engineering, Yonsei University) ;
  • Yukwon Jeon (Department of Environmental and Energy Engineering, Yonsei University) ;
  • Dong Jin Kim (Environmental Research Institute, Kangwon National University) ;
  • Sang Soo Lee (Department of Environmental and Energy Engineering, Yonsei University)
  • 오세진 (연세대학교 환경에너지공학과) ;
  • 강민우 (연세대학교 환경에너지공학과) ;
  • 이종철 (연세대학교 환경에너지공학과) ;
  • 이훈호 (연세대학교 환경에너지공학과) ;
  • 노현석 (연세대학교 환경에너지공학과) ;
  • 전유권 (연세대학교 환경에너지공학과) ;
  • 김동진 (강원대학교 환경연구소) ;
  • 이상수 (연세대학교 환경에너지공학과)
  • Received : 2022.10.06
  • Accepted : 2022.10.18
  • Published : 2022.12.31

Abstract

BACKGROUND: Mining activities, smelter discharges, and sludges are the major sources of heavy metal contamination to soils. The objective of this study was to determine the efficiency of magnetite and bottom ash derived from coal ash in remediating As-contaminated soil. METHODS AND RESULTS: An incubation experiment was conducted for 10 weeks. Magnetite and bottom ash at different rates and ratios were applied to each plastic bottle repacked with 1,000 g of dried As-contaminated soil. After 3-weeks of incubation, the concentrations of available As were measured by using Mehlich-3, SBET, and sequential extraction methods. All of the subjected soil amendments resulted in significant decreases in available As concentration compared to the controls. The addition of magnetite at the highest rate was the best to stabilize As in the soils; however, the values of As concentration varied with the extraction methods. CONCLUSION(S): To ensure the stabilization accuracy of heavy metals in soil, both single and sequential extractions are recommended. The magnetite derived from fly coal ash can also be applicable as a heavy metal stabilizer for the As-contaminated soil.

Keywords

Acknowledgement

This research was supported by the Basic Research Program through the National Research Foundation of Korea (NRF) funded by the MSIT (2022R1A4A1029632).

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