Soil Washing Coupled with the Magnetic Separation to Remediate the Soil Contaminated with Metal Wastes and TPH

자력선별과 토양세척법을 연계하여 금속폐기물과 TPH로 복합 오염된 토양 동시 정화

  • Han, Yikyeong (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Lee, Minhee (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Wang, Sookyun (Department of Energy Resources Engineering, Pukyong National University) ;
  • Choi, Wonwoo (Environmental Restoration Project Office, Korea Rural Community Corporation)
  • 한이경 (부경대학교 지구환경과학과) ;
  • 이민희 (부경대학교 지구환경과학과) ;
  • 왕수균 (부경대학교 에너지자원공학과) ;
  • 최원우 (한국농어촌공사 환경복원사업소)
  • Received : 2019.01.14
  • Accepted : 2019.02.08
  • Published : 2019.02.28


Batch experiments for the soil washing coupled with the magnetic separation process were performed to remediate the soil contaminated with metal and oil wastes. The soil was seriously contaminated by Zn and TPH (total petroleum hydrocarbon), of which concentrations were 1743.3 mg/kg and 3558.9 mg/kg, respectively, and initial concentrations of Zn, Pb, Cu, and TPH were higher than the 2nd SPWL (soil pollution warning limit: remediation goal). The soil washing with acidic solution was performed to remove heavy metals from the soil, but Pb and Zn concentration of the soil maintained higher than the 2nd SWPL even after the soil washing with acidic solution. The 2nd soil washing was repeated to increase the Pb and Zn removal efficiency and the Zn and Pb removal efficiencies additionally increased by only 8 % and 5 %, respectively, by the 2nd soil washing (> 2nd SPWL). The small particle separation from the soil was conducted to decrease the initial concentration of heavy metals and to increase the washing effectiveness before the soil washing and 4.1 % of the soil were separated as small particles (< 0.075 mm in diameter). The small particle separation lowered down Zn and Pb concentrations of soil to 1256.3 mg/kg (27.9 % decrease) and 325.8 mg/kg (56.3 % decrease). However, the Zn concentration of soil without small particles still was higher than the 2nd SPWL even after the soil washing, suggesting that the additional process is necessary to lower Zn concentration to below the 2nd SPWL after the treatment process. As an alternative process, the magnetic separation process was performed for the soil and 16.4 % of soil mass were removed, because the soil contamination was originated from unreasonable dumping of metal wastes. The Zn and Pb concentrations of soil were lowered down to 637.2 mg/kg (63.4 % decrease) and 139.6 mg/kg (81.5 % decrease) by the magnetic separation, which were much higher than the removal efficiency of the soil washing and the particle separation. The 1st soil washing after the magnetic separation lowered concentration of both TPH and heavy metals to below 2nd SPWL, suggesting that the soil washing conjugated with the magnetic separation can be applied for the heavy metal and TPH contaminated soil including high content of metal wastes.


soil washing;soil contamination;soil remediation;particle separation;magnetic separation;heavy metals;TPH

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Fig. 1. Research site (left) and the contaminated soil (the right top: with metal wastes; the right bottom: with metal wastesand oil wastes) for the study.

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Fig. 2. Removal efficiencies of heavy metals for 1st soil washing(SPWL: Soil Pollution Warning Limit).

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Fig. 3. Removal efficiencies of Zn and Pb for 1st and 2nd soil washing (SPWL: Soil Pollution Warning Limit).

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Fig. 4. Removal efficiencies of Pb and Zn for 1st soil washing after small particle separation (SPWL: Soil Pollution Warning Limit).

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Fig. 5. Removal efficiencies of Pb and Zn for 1st soil washing after magnetic separation (SPWL: Soil Pollution Warning Limit).

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Fig. 6. Removal efficiencies of TPH for 1st soil washing after magnetic separation (SPWL: Soil Pollution Warning Limit).

Table 1. Operating conditions for GC/FID and ICP/OES for analyses in this study

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Table 2. The properties and TPH/heavy metal concentration of soil used in this study

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Table 3. Heavy metal and TPH concentration of soil before/after particle separation and magnetic separation process

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Supported by : 부경대학교


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