Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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A Study on Phosphate Removal Characteristic of EAF Slag for Submarine Cover Material

EAF Slag의 해양복토제 활용을 위한$PO_4{^-}-P$ 제거특성에 관한 연구

  • Kim, Jae-Won (DONGKUK STEEL MILL CO., LTD, Environment & Safety Control Team) ;
  • Seo, Jong-Beom (Department of Environmental Engineering, Pusan National University) ;
  • Kang, Min-Gyeong (Department of Environmental Engineering, Pusan National University) ;
  • Kim, In-Deuk (Busan Metropolitan City Yeonjegu Environment & Sanitation division) ;
  • Oh, Kwang-Joong (Department of Environmental Engineering, Pusan National University)
  • 김재원 (동국제강(주) 환경안전팀) ;
  • 서종범 (부산대학교 사회환경시스템공학과) ;
  • 강민경 (부산대학교 사회환경시스템공학과) ;
  • 김인득 (부산광역시 연제구청 환경위생과) ;
  • 오광중 (부산대학교 사회환경시스템공학과)
  • Received : 2010.11.03
  • Accepted : 2010.11.24
  • Published : 2010.12.31
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Abstract

This study estimated the possibility of phosphate removal characteristics to utilize EAF(electric arc furnace) slag as submarine cover material. The major phosphate removal mechanism was a certain formation of HAP precipitation occurred by the ionization reaction between $Ca^{2+}$ and $OH^-$, which were leached from the EAF Slag. Another phosphate removal mechanism was the adsortion of EAF slag surface. As a result of $PO_4{^-}-P$ removal characteristics using continuous column reactor, $PO_4{^-}-P$ concentration decreased rapidly after 3 days and 10 days later, it show under 0.5 ppm. The result as applied in real sea water, shows that the phosphate removal effects were 93~98% by the subaqueous sediment removal using the EAF slag. In conclusion, EAF slag is useful in $PO_4{^-}-P$ removal and control and it is possible to use without additional process like crush and selection.

본 연구에서는 제강전기로 슬래그를 해양복토제로 활용하기 위한 인제거 특성실험을 실시하였다. 제강전기로 슬래그의 $PO_4{^-}-P$ 제거 특성에 관한 시험 결과, 슬래그 내의 CaO는 $Ca^{2+}$와 $OH^-$로 이온화됨에 따라 $PO_4{^-}-P$와 반응하여 HAP를 형성함으로써 용액 중에 존재하는 $PO_4{^-}-P$를 효과적으로 제거하는 것으로 나타났다. 연속반응기를 통한 해수 내 $PO_4{^-}-P$의 지속적인 유업에 대한 제거특성을 확인한 결과, 칼럼 내 $PO_4{^-}-P$ 농도는 반응 3일 이후 급격히 감소하여 10일 이후에는 0.5 ppm 이하로 나타났다. 실제 연안해역의 저질을 이용한 제강전기로 해양복토제 적용실험 결과, 반응 25일 후 $PO_4{^-}-P$ 발생량을 93~98% 저감시키는 것으로 나타났다. 이러한 결과를 바탕으로 제강전기로 슬래그를 해양복토제로 활용할 경우 $PO_4{^-}-P$ 제거 및 억제효과가 있으며, 파쇄선별 등 별도의 추가공정 없이 적은 량으로도 사용 가능할 것으로 판단된다.

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References

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