Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Stabilization of Heavy Metals in Contaminated Marine Sediment using Bentonite

벤토나이트에 의한 해양오염퇴적물 내 중금속 안정화 특성

  • Shin, Woo-Seok (Institute of Marine Science and Technology Research, Hankyong National University) ;
  • Na, Kyu-Ri (Institute of Marine Science and Technology Research, Hankyong National University) ;
  • Kim, Young-Kee (Department of Chemical Engineering, Hankyong National University)
  • 신우석 (한경대학교 해양과학기술연구센터) ;
  • 나규리 (한경대학교 해양과학기술연구센터) ;
  • 김영기 (한경대학교 화학공학과)
  • Received : 2014.10.21
  • Accepted : 2014.12.08
  • Published : 2014.12.31
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Abstract

In this study, stabilization treatment of heavy metals such as Ni, Cu, Pb, and Zn in contaminated marine sediment was achieved using bentonite. Stabilization experiment was accomplished by wet-curing with bentonite for 150 days. From the sequential extraction results of heavy metals, it was observed that the easily extractable fraction (exchangeable, carbonate, and oxides forms) of Ni, Cu, Pb, and Zn in a treated sediment decreased to 8.5%, 5.6%, 19.2%, and 28.2%, respectively, compared with untreated sediment. Moreover, the TCLP(Toxicity Characteristic Leaching Procedure) results evaluating efficiency of extraction reduction of heavy metals showed that extraction of heavy metals reduced drastically to 95.7%, 96.8%, 99.2%, 85.9% for Ni, Cu, Pb, and Zn by stabilization when compared to untreated sediment. From these results, we can confirm that bentonite as a capping material exhibits good stabilization of heavy metals in contaminated marine sediment.

본 연구에서는 해양오염퇴적물 내 Ni, Cu, Pb 및 Zn 등 중금속에 대하여 벤토나이트를 이용한 안정화 처리를 수행하였다. 안정화 실험은 해양오염퇴적물에 벤토나이트 첨가 후 150일간 습윤 양생 하여 실시하였다. 중금속 연속추출 결과로부터, 미처리 오염퇴적물과 비교해서 Ni, Cu, Pb 및 Zn은 용이하게 용출가능한 존재형태(이온교환, 탄산염, 산화물 형태)가 벤토나이트에 의해 각각 8.5%, 5.6%, 19.2% 및 28.2% 감소하였다. 또한, 안정화제 의한 오염퇴적물의 용출저감 평가를 위해 TCLP(Toxicity Characteristic Leaching Procedure)를 수행한 결과, 미처리 오염퇴적물과 비교하여 안정화 처리 퇴적물인 경우 중금속의 용출량이 각각 Ni 95.7%, Cu 96.8%, Pb 99.2%, Zn 85.9%씩 크게 감소하는 것을 확인하였다. 이러한 결과로부터, 벤토나이트를 해양오염퇴적물의 피복소재로 사용할 경우 시험 대상 중금속의 안정화 효과가 확인되었다.

Keywords

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