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2015 Vol.52, Issue 1 Preview Page

Research Paper

28 February 2015. pp. 31-41
Abstract
Soils in the site A around Sang-dong mine were identified as sand loam based on our analysis. Thesesoils dominantly contain fine and coarse particles which are inappropriate for soil washing and flotation. Anaverage concentration of arsenic in the soil is about 200 mg/kg. Wenzel’s sequestration method was used tocharacterize the type of arsenic in the soil. 60~70% arsenic exists as a form removable by washing in the 1st,2nd, and 3rd steps, while 4th and 5th steps contain 30~40% of arsenic which is proper to be sequestrated byreverse flotation. In our soil remediation tests for the actual soil from the site A(around Sang-dong mine), 75%removal efficiency of arsenic was obtained by a washing method and 35% by a reverse flotation method. Thecombination of soil washing and flotation methods based on the characteristics of the soil and the forms of arsenicwas able to remove arsenic to less than the regulated concentration. Thus, our results suggest that characteristicsof a soil and the form of toxicants are important factors to choose remediation technologies in fields.
상동광산 주변 A지역의 토성분석 결과, sandy loam 토양으로 분류되었다. 즉, A지역의 원토양은 토양세척에 적합하지 않은 미립자와 부유선별에 적합하지 않은 조립자가 다량 존재하고 있다. A지역 원토양의 비소농도는 약 200 mg/kg이었다. 그리고 토양에 존재하는 비소의 존재형태를 Wenzel의 연속추출법으로 분석한 결과,입도군에 따라 약간의 차이는 있으나 토양세척으로 제거 가능한 존재형태인 1, 2, 3단계의 비소는 60~70%그리고 선별법으로 제거 가능한 존재형태인 4, 5 단계의 비소는 30~40% 임을 알 수 있었다. 실제 토양정화실험결과, 역부선법으로 35% 정도의 비소 제거효율 그리고 토양세척법으로 75% 정도의 비소 제거효율을 얻어냈다.따라서 토양세척 및 역부선을 병행하여 수행할 경우 A지역의 비소오염토양을 1지역 토양오염 우려기준 이하로정화시킬 수 있다고 판단된다. 따라서 본 연구를 통해 토양의 특성과 오염의 존재형태를 파악하는 것이 현장에서의 오염토양 정화기술을 선택하는 중요한 조건임을 제시하는 바이다.
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 52
  • No :1
  • Pages :31-41