Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Effect of the Applied Biostimulant Depth on the Bioremediation of Contaminated Coastal Sediment

연안오염퇴적물에 주입한 생물활성촉진제의 깊이가 생물정화효율에 미치는 영향

  • Woo, Jung-Hui (Nuclear Power Equipment Research Center, Korea Maritime and Oean University) ;
  • Subha, Bakthavachallam (Department of Environmental Engineering, Korea Maritime and Oean University) ;
  • Song, Young-Chae (Department of Environmental Engineering, Korea Maritime and Oean University)
  • 우정희 (한국해양대학교 원전기자재연구센터) ;
  • 수바 (한국해양대학교 환경공학과) ;
  • 송영채 (한국해양대학교 환경공학과)
  • Received : 2015.06.09
  • Accepted : 2015.08.21
  • Published : 2015.08.31
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Abstract

This study investigated the optimum depth for the application of bioremediation in contaminated coastal sediment using a lab scale column experiment. The biostimulants were placed in the top surface of the sediment facing seawater, 3cm, 6cm and 10cm of the depth from the surface, respectibely. During the experiment, the changes of organic pollutants and heavy metal fractions in the sediment were monitored in 1 month and 3month time intervals. The organic pollutants found during various analysis such as chemical oxygen demand, total solids and volatile solids, significantly reduced when the depth of the biostimulant was 3cm or less. In contrast, at a depth of over 6cm, the reduction of organic pollutants decreased, and the results were similar to the control. Heavy metals fractions in the sediment also changed with the depth of the biostimulants. The exchangeable fraction of the metals was quite reduced at the sediment surface in the column, but the organic bound and residual fractions considerably increased at a depth of 3cm. Based on this study, the optimum biostimulants depth for in-situ bioremediation of contaminant coastal sediment is 3cm from the sediment surface.

실험실 규모의 관 실험을 통하여 연안오염퇴적물의 생물정화 효능에 대한 생물활성촉진제 주입 깊이의 영향을 평가하였다. 생물활성촉진제를 실험관에 충진 된 오염퇴적물의 표면과 표면으로부터 3cm, 6cm, 10cm 위치에 주입한 후 1개월 및 3개월 후 퇴적물의 유기물 및 중금속의 특성 변화를 조사하였다. 시험 오염퇴적물의 화학적 산소요구량, 총고형물 및 휘발성고형물 함량은 생물활성촉진제를 주입하지 않은 대조구에 비해 1개월 후 및 3개월 후에서 크게 감소하였으며, 생물활성촉진제 주입 깊이 3cm에서 최대값을 보였다. 그러나, 오염퇴적물에 주입한 생물활성촉진제의 깊이를 6cm 및 10cm로 증가하였을 때 유기오염물질 감량정도는 점차 감소하였다. 중금속 존재형태변화는 생물활성촉진제 주입 깊이 3cm에서 안정한 형태인 유기물 결합분율과 광물내 잔류분율이 현저하게 증가하였다. 오염퇴적물의 현장생물정화를 위한 최적의 생물활성촉진제 주입 깊이는 퇴적물의 상부 표면으로부터 3cm로 평가되었다.

Keywords

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