Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study on Changes of the Benthic Environment and Microbial Community in Estuarine Polluted Sediments by Mixing Granulated Coal Ash

석탄회 조립물이 혼합된 하구 오염 퇴적물의 환경 및 미생물 구조 변화에 관한 연구

  • Kim, Heontae (Department of Ocean Engineering, Pukyong National University) ;
  • Woo, Hee-Eun (Department of Ocean Engineering, Pukyong National University) ;
  • Kim, Jong-Oh (Institute of Marine Biotechnology, Pukyong National University) ;
  • Kim, Kyunghoi (Department of Ocean Engineering, Pukyong National University)
  • 김헌태 (부경대학교 해양공학과) ;
  • 우희은 (부경대학교 해양공학과) ;
  • 김종오 (부경대학교 해양생명과학연구소) ;
  • 김경회 (부경대학교 해양공학과)
  • Received : 2021.04.30
  • Accepted : 2021.06.28
  • Published : 2021.06.30
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Abstract

In this study, the benthic environmental and microbial community structure were investigated by mixing granulated coal ash(GCA) and contaminated estuary sediments. Estuary sediments and GCA were mixed in a ratio of 8:2 and allowed to interact for 1 month, then sediment environmental factors were investigated. The pH of the experimental sediment was mixed increased to 11. The concentration of DIP(Dissolved inorganic phosphorus) in the experimental case decreased by 30 % compared to the control case, and this should be due to formation of calcium phosphate through the chemical reaction of DIP and calcium which diluted from GCA. The high abundance of Gammaproteobacteria seen in the experimental sediment compare to the control can af ect the DIP reduction. The DIN(Dissolved inorganic nitrogen) concentration increased over two times in the experimental case than the control, and this should be due to the high pH condition and release of NH4+-N from the GCA. Microorganisms related to nitrogen circulation were not identified in both the control and experimental cases. It was confirmed that the GCA were effective in reducing the DIP concentration in contaminated estuary sediment, and that benthic microbial communities were shown to influenced the phosphorus circulation.

육상으로부터 각종 오염물질이 유입되는 하구역은 오염관리에 주의를 기울일 필요가 있다. 본 연구에서는 석탄회 조립물과 하구의 오염 퇴적물을 혼합하여 저서 환경 개선 효과 및 저서 미생물의 군집 구조 변화를 조사하였다. 하구 퇴적물과 석탄회 조립물을 7:3의 비율로 혼합하여 1개월 동안 반응시킨 후 환경 및 미생물 군집을 분석하였다. 퇴적물의 환경인자를 분석한 결과, 석탄회 조립물이 혼합된 실험구의 pH는 11까지 증가하였다. 실험구의 DIP 농도는 석탄회 조립물과의 반응을 통해 생성된 인산칼슘으로 인해 대조구 대비 30 % 감소하였다. 또한 대조구 대비 실험구에서 증가한 Gammaproteobacteria 강은 DIP 감소에 영향을 줄 수 있음을 확인하였다. DIN 농도는 대조구 대비 실험구에서 2배 이상 증가하였는데, 이는 높은 pH 및 석탄회 조립물에서 용출되는 NH4+-N의 영향인 것으로 판단된다. 질소 순환과 관련된 미생물은 대조구 및 실험구 모두에서 확인되지 않았다. 따라서, 석탄회 조립물은 오염된 하구 퇴적물의 DIP 농도 감소에 효과적이며, 저서 미생물 군집이 인의 순환에 영향을 주는 것으로 나타났다.

Keywords

Acknowledgement

이 논문(또는 저서)은 부경대학교 자율창의학술연구비(2019년)에 의하여 연구되었음.

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