Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Comparison of Pipeline and Clamshell Capping Technologies for the Remediation of Contaminated Marine Sediments

해양 오염퇴적물 정화를 위한 원통관과 클램쉘을 이용한 피복 기술의 비교

  • Kang, Ku (Institute of Marine Science & Technology Research, Hankyong National University) ;
  • Hong, Seong-Gu (Department of Bioresources & Rural systems Engineering, Hankyong National University) ;
  • Kim, Young-Kee (Department of Chemical Engineering, Hankyong National University) ;
  • Park, Seong-Jik (Research Institute of Agricultural & Environmental Science, Hankyong National University)
  • 강구 (한경대학교 해양과학기술연구센터) ;
  • 홍성구 (한경대학교 지역자원시스템공학과) ;
  • 김영기 (한경대학교 화학공학과) ;
  • 박성직 (한경대학교 농촌환경과학연구소)
  • Received : 2017.07.26
  • Accepted : 2017.08.25
  • Published : 2017.08.31
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Abstract

In situ capping technology for marine sediment pollution control has never been applied in South Korea. In this study a pilot project for the capping was carried out in Busan N Harbor. Pipeline and clamshell capping technologies were implemented for the pollution control. Changes of capping shapes, sediment contamination, and the time and costs required for the two constructions were compared. Both the pipeline and clamshell technologies were found to satisfy the target thickness of 50 cm on average. However, the pipeline method did not operate sensitively in terms of change of the sea floor topography, resulting in an uneven shape and a thickness. Organic carbon and ignition loss quite decreased after the pipeline or the clamshell capping while pH showed no significant change. Organic and residual fraction of Cd, Ni, and Zn in the sediments appeared to decrease after all cappings. The pipeline method took a construction time four times as much as the clamshell method. The clamshell method was demonstrated to reduce the construction cost by about 40% compared with the pipeline method. However, a monitoring for all the parameters needs to be conducted at least two years in order to better evaluate an efficiency of the pollution control by these capping constructions.

국내에 원위치 피복기술의 적용 사례가 전무한 가운데 본 연구에서는 부산 N항을 대상으로 피복 기술에 대한 시범 사업을 수행하였다. 오염 정화를 위하여 원통관과 클램쉘을 이용한 피복 공법이 적용되었다. 두 공법의 피복형상 변화, 퇴적물 오염도 변화, 공정 소요시간, 소요비용을 산정하고 비교하였다. 원통관 공법과 클램쉘 공법 모두 목표 두께인 50 cm를 평균적으로 만족하였다. 그러나 원통관 공법은 해저지형 변화에 민감하게 반응하지 못하는 단점을 가지고 있어 비균일한 피복형상을 나타내었다. 원통과 공법과 클램쉘 공법 적용 시 유기물 함량은 매우 감소하였지만, pH의 뚜렷한 변화는 없었다. Cd, Ni, Zn의 유기물 및 잔류 형태의 비율이 피복 후 증가하였다. 원통관 공법의 경우 클램쉘 공법에 비해 공정 소요시간이 약 4배 정도 더 소요되었다. 클램쉘 공법의 시공비용은 원통관 공법에 비해 약 40% 절감 되는 것으로 나타났다. 오염 퇴적물 정화 효율에 대한 평가를 위해서는 최소 2년 이상의 장기적인 모니터링이 진행되어야 한다.

Keywords

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