Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Potential Environmental Influences in Soil by Accidental Fluorine (F) Leakage, Using Leaching Test

용출시험을 통한 불산 누출사고지역의 토양 내 불소(F)의 거동특성

  • Kim, Doyoung (Environmental Engineering Section, The Catholic University of Korea) ;
  • Lee, Junseok (Seoul Center, Korea Basic Science Institute, Republic of Korea) ;
  • Kwon, Eunhye (Environmental Engineering Section, The Catholic University of Korea) ;
  • Lee, Hyun A (Seoul Center, Korea Basic Science Institute, Republic of Korea) ;
  • Yoon, Hye-On (Seoul Center, Korea Basic Science Institute, Republic of Korea) ;
  • Lee, Sanghoon (Environmental Engineering Section, The Catholic University of Korea)
  • 김도영 (가톨릭대학교 생명공학과 환경공학전공) ;
  • 이준석 (한국기초과학지원연구원) ;
  • 권은혜 (가톨릭대학교 생명공학과 환경공학전공) ;
  • 이현아 (한국기초과학지원연구원) ;
  • 윤혜온 (한국기초과학지원연구원) ;
  • 이상훈 (가톨릭대학교 생명공학과 환경공학전공)
  • Received : 2015.02.27
  • Accepted : 2015.04.30
  • Published : 2015.04.30
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Abstract

Various leaching tests were applied to the soil affected by accidental leakage of HF in an industrial area in Korea. Three different leaching methods including pH-stat, continuous batch leaching, and column tests were adopted to assess leaching characteristics and mobility of fluorine(F) in soil and the potential risks to ecosystem. Both natural and spiked samples were used for the leaching tests. F concentrations in the batch tests increased by leaching rapidly in the early stage of leaching and then maintained rather constant levels. Column leaching test also show similar result to that of the batch test. pH also controlled the leaching behavior of the soil. With increasing pH, more F was released in the pH-stat test. This is mainly due to the competition and exchange with hydroxyl ions, as pH increase to the alkaline range. Most of the F released by the accident seem to have removed in the very early stage of leaching, whereas some natural proportion from soil minerals are thought to have been released very slowly. Therefore, little F released during the accident remained, based on the results of this study on the samples after two years of the accident. We could conclude that soil contaminated by external effects such as chemical accidents should be managed immediately, especially with F.

본 연구는 불산 누출사고로 인한 토양 내 불소의 잔류여부 및 용출특성을 파악하여 장 단기적 환경위해성을 조사하고자 하였다. pH 유지 용출시험, 연속 회분식 용출시험, 주상용출시험 등을 적용하였다. 이는 다양한 환경과 시간범위에서 불소의 용출정도를 조사하여 이동도 및 용출특성을 포괄적으로 이해하고자 함이다. 대부분의 토양시료에 대하여 pH가 알칼리성으로 증가할수록 수산화이온과의 경쟁 및 치환으로 인하여 불소의 용출농도 역시 증가하였다. 연속 회분식 용출시험에서는 인공오염 토양시료에서 초기 불소의 용출농도가 매우 높게 나타났으나 2차 용출 이후 현장토양시료와 유사한 낮은 용출농도를 보였다. 또한, 주상용출시험의 경우도 인공오염 토양시료에서의 초기 용출단계에서 다량의 불소가 용출되는 경향을 나타냈다. 다양한 용출시험 결과 초기 토양입자표면에 잔류한 불소는 비교적 초기에 쉽게 제거되는 것을 확인하였으며, 사고로 인한 잔류불소의 영향은 2년이 지난 현재 시점에서 매우 적다고 판단된다. 따라서 실제 화학물질 사고와 같은 외부적인 영향을 받은 환경피해지역 토양에 대하여 즉각적인 오염확산관리가 선행되어야 할 것이다.

Keywords

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