폐광산 주변 오염토양 정화를 위한 실규모 토양세척공정 적용

Application of A Full Scale Soil Washing Process for the Remediation of Contaminated Soil around an Abandoned Mine

  • Seo, Sang-Kee (Office of Environmental Geology, Korea Rural Community & Agriculture Corporation) ;
  • Lee, Sang-Hwa (Office of Environmental Geology, Korea Rural Community & Agriculture Corporation) ;
  • Son, Jeong-Ho (Department of Environmental Engineering, Kwangwoon University) ;
  • Chang, Yoon-Young (Department of Environmental Engineering, Kwangwoon University)
  • 발행 : 2008.04.30

초록

중금속으로 오염된 폐광산지역 토양을 정화하기 위해 실규모 토양세척공정을 적용하였다. $H_2SO_4$을 이용한 토양세척시 Cd의 경우 정화목표를 달성할 수 있었지만 낮은 세척효율을 나타내었으며, Zn은 낮은 세척효율로 인해 세척 후 토양의 농도가 토양오염우려기준 미만으로 저감되지 않았다. Cd 및 Zn은 토양세척 후 농도가 저감되는데 반해 As의 경우 세척 전에 비해 세척 후 토양의 As 농도가 지속적으로 증가되는 경향을 보였다. NaOH를 사용하여 세척효율을 평가한 결과, Cd와 Zn의 농도는 저감되었으나, 세척 전에 비해 세척 후 As의 농도가 더 높게 나타나 황산으로 세척한 경우와 유사한 경향을 보였다. 이러한 세척효율을 저하시키는 원인은 처리대상 토양의 입도분포 및 실규모토양세척으로 확대 적용함에 따라 발생하는 여러 가지 문제점으로 요약할 수 있으며, 세척 후 As의 농도가 증가하는 현상은 토양 내 As의 존재형태에 기인하는 것으로 판단되었다.

This study was carried out to evaluate the applicability of the full scale soil washing processes for reducing heavy metal contamination level of soil around an abandoned mine. In the results of soil washing of the target soil with $H_2SO_4$ and NaOH, the As concentrations of treated soil continuously increased compared with contaminated raw soil. Also, removal efficiencies of Zn and Ni were low. This problems might be caused by chemical partitioning of As in soil and its geologic origination, soil particle size, and scale up of washing plant.

키워드

참고문헌

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