해양퇴적물에서 중금속 용출 차단 및 퇴적물 산소 요구량 감소를 위한 석회석, 제올라이트 및 폐콘크리트의 피복 소재로서 적용
Application of Limestone, Zeolite, and Crushed Concrete as Capping Material for Interrupting Heavy Metal Release from Marine Sediments and Reducing Sediment Oxygen Demand
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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 (288.37 mg/m 2 ·d) < zeolite (428.96 mg/m 2 ·d) < limestone (904.53 mg/m 2 ·d) < uncapped (981.34 mg/m 2 ·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.
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 (288.37 mg/m 2 ·d) < zeolite (428.96 mg/m 2 ·d) < limestone (904.53 mg/m 2 ·d) < uncapped (981.34 mg/m 2 ·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.
참고문헌 (27)
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