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Application of Limestone, Zeolite, and Crushed Concrete as Capping Material for Interrupting Heavy Metal Release from Marine Sediments and Reducing Sediment Oxygen Demand

해양퇴적물에서 중금속 용출 차단 및 퇴적물 산소 요구량 감소를 위한 석회석, 제올라이트 및 폐콘크리트의 피복 소재로서 적용

  • Kang, Ku (Graduate School of Future Convergence Technology, Hankyong National University) ;
  • Park, Seong-Jik (Department of Bioresources and Rural systems Engineering, Hankyong National University)
  • Received : 2015.04.29
  • Accepted : 2015.06.05
  • Published : 2015.07.30

Abstract

This study aims to assess the effectiveness of limestone, zeolite, and crushed concrete as capping material to block the release of heavy metals (As, Cu, Cr, Ni, and Pb) and reduce the sediment oxygen demand. The efficiency of limestone, zeolite, and crushed concrete was evaluated in a reactor in which a 1-cm thick layer of capping materials was placed on the sediments collected from Inchon north harbor. Dissolved oxygen concentration and heavy metal concentration in seawater above the uncapped sediments and capping material were monitored for 17 days. The sediment oxygen demand was in the following increasing order: crushed concrete ($288.37mg/m^2{\cdot}d$) < zeolite ($428.96mg/m^2{\cdot}d$) < limestone ($904.53mg/m^2{\cdot}d$) < uncapped ($981.34mg/m^2{\cdot}d$). The capping materials could reduce the sediment oxygen demand by blocking the release of biochemical matters consuming dissolved oxygen in seawater. It was also shown that zeolite and crushed concrete could effectively block the release of Cu, Ni, and Pb but those were not effective for the interruption of As and Cr release from marine contaminated sediments.

Acknowledgement

Grant : 지속가능 해양오염퇴적물 정화기술 개발

Supported by : 한국해양과학기술진흥원

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