Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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Remediation of Heavy Metal Contamination in OBOD Site with Soil Washing : Selection of Extractants

토양세척법에 의한 중금속오염 폐탄처리장 토양의 정화 : 세척액의 선정

  • Lee, Sang-Hwan (Office of Environmental Geology, Korea Rural Community and Agricultural Corporation) ;
  • Kim, Eul-Young (Office of Environmental Geology, Korea Rural Community and Agricultural Corporation) ;
  • Seo, Sang-Kee (Office of Environmental Geology, Korea Rural Community and Agricultural Corporation) ;
  • Kim, Gweon-Bo (Office of Environmental Geology, Korea Rural Community and Agricultural Corporation) ;
  • Kim, Jae-Hwan (Office of Environmental Geology, Korea Rural Community and Agricultural Corporation) ;
  • Lee, Jong-Keun (Division of Environmental Science and Ecological Engineering, College of Life and Environmental Sciences, Korea University)
  • 이상환 (한국농촌공사 환경지질사업처) ;
  • 김을영 (한국농촌공사 환경지질사업처) ;
  • 서상기 (한국농촌공사 환경지질사업처) ;
  • 김권보 (한국농촌공사 환경지질사업처) ;
  • 김재환 (한국농촌공사 환경지질사업처) ;
  • 이종근 (고려대학교 환경생태공학부)
  • Published : 2008.04.30
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Abstract

The efficiences of mineral acid (HCl), neutral salts ($CaCl_2$), and chelating agent (citric acid and $Na_2$-EDTA) were tested for extracting heavy metals from open burning and open detonation (OBOD) site soil. The extraction efficiencies of Cd, Cu, Pb and Zn from soil for various extractants were in the order of HCl > citric acid > $Na_2$-EDTA > $CaCl_2$, HCl (1.0 M) extracted effectively 82%, 86%, 80%, and 46% of initial total concentrations of Cd, Cu, Pb, and Zn, respectively. Significant negative correlations were observed between pH of extractant and amount of extracted heavy metals. Initially, examined heavy metals were predominantly bound to carbonate and Fe, Mn-oxide fraction. Though the significant amount of carbonate and Fe, Mn-oxide bounded metals were removed but a significant amount remained metals shifted to exchangeable (more mobile) fraction by HCl and citric acid extraction. The increased mobility of remaining metals could be problematic for water resources, thus careful management is needed to control the movement of heavy metals.

폐탄처리과정에서 오염된 중금속 오염토양의 정화에 있어 무기산(HCl), 중성염($CaCl_2$), 킬레이트제(citric acid, $Na_2$-EDTA)들을 이용한 토양세척 가능성을 평가하였다. 실험에 사용된 추출액(HCl, $CaCl_2$, citric acid, $Na_2$-EDTA)들의 추출효율은 HCl > citric acid > $Na_2$-EDTA > $CaCl_2$의 순으로 나타났는데 HCl(1.0 M)에 의해서 Cd, Cu, Pb와 Zn이 초기농도 대비 각각 82%, 86%, 80%, 46% 정도 추출된 것으로 나타났다. 추출효율과 반응액의 pH 간에는 고도의 음의 상관관계가 존재하였다. 폐탄약처리장 부지 토양 중 중금속은 탄산염결합태, Fe, Mn-산화물 결합태 형태로 존재하고 있었는데 HCl, citric acid 세척에 의해서 이들 분획의 현저한 감소가 이루어졌지만 이동성이 상대적으로 큰 치환태가 증가되는 것으로 나타났다. 이동성이 큰 분획의 증가는 지하수 오염 등의 문제를 야기시킬 수 있음으로 이에 대한 적절한 관리가 필요할 것으로 판단된다.

Keywords

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