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Phosphorus Adsorption Characteristic of Ferronickel and Rapid Cooling Slags

페로니켈슬래그와 제강급랭슬래그의 인 흡착특성

  • Park, Jong-Hwan (Division of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Science, GyeongSang National University) ;
  • Seo, Dong-Cheol (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Kim, Seong-Heon (Division of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Science, GyeongSang National University) ;
  • Park, Min-Gyu (Division of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Science, GyeongSang National University) ;
  • Kang, Byung-Hwa (Department of R&D, Hyoseok, co., LTD.) ;
  • Lee, Sang-Won (Department of Pharmaceutical Engineering, Gyeongnam National University of Science and Technology) ;
  • Lee, Seong-Tae (Division of Crop Science, Gyeongnam Agricultural Research and Extension Services) ;
  • Choi, Ik-Won (Department of Water Environment Research, National Institute of Environmental Research) ;
  • Cho, Ju-Sik (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Heo, Jong-Soo (Division of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Science, GyeongSang National University)
  • 박종환 (경상대학교 응용생명과학부 (Bk21 농생명산업 글로벌 인재 육성 사업단) & 농업생명과학원) ;
  • 서동철 (순천대학교 생물환경학과) ;
  • 김성헌 (경상대학교 응용생명과학부 (Bk21 농생명산업 글로벌 인재 육성 사업단) & 농업생명과학원) ;
  • 박민규 (경상대학교 응용생명과학부 (Bk21 농생명산업 글로벌 인재 육성 사업단) & 농업생명과학원) ;
  • 강병화 (효석 연구개발실) ;
  • 이상원 (경남과학기술대학교 제약공학과) ;
  • 이성태 (경상남도농업기술원 작물연구과) ;
  • 최익원 (국립환경과학원 물환경연구부) ;
  • 조주식 (순천대학교 생물환경학과) ;
  • 허종수 (경상대학교 응용생명과학부 (Bk21 농생명산업 글로벌 인재 육성 사업단) & 농업생명과학원)
  • Received : 2014.07.22
  • Accepted : 2014.08.07
  • Published : 2014.09.30

Abstract

BACKGROUND: The ferronickel and rapid cooling slags used in present study are industrial wastes derived from a steel factory in Korea. These slags are used as almost road construction materials after magnetic separation. However, the use of slag to remove phosphorus from wastewater is still a relatively less explored. The objective of this work was to evaluate the feasibility of ferronickel slag (FNS) and rapid cooling slag (RCS) as sorbents for phosphorus removal in wastewater. METHODS AND RESULTS: Adsorption experiments were conducted to determine the adsorption characteristics of the FNS and RCS for the phosphorus. Adsorption behaviour of the phosphorus by the FNS and RCS was evaluated using both the Freundlich and Langmuir adsorption isotherm equations. FNS and RCS were divided into two sizes as effective sizes. Effective sizes of FNS and RCS were 0.5 and 2.5 mm, respectively. The adsorption capacities (K) of the phosphorus by the FNS and RCS were in the order of RCS 0.5 (0.5105) > RCS 2.5 (0.3572) ${\gg}$ FNS 2.5 (0.0545) ${\fallingdotseq}$ FNS 0.5 (0.0400) based on Freundlich adsorption isotherm. The maximum adsorption capacities (a; mg/kg) of the phosphorus determined by the Langmuir isotherms were in the order of RCS 0.5 (3,582 mg/kg) > RCS 2.5 (2,983 mg/kg) > FNS 0.5 (320 mg/kg) ${\fallingdotseq}$ FNS 2.5 (187 mg/kg). RCS 0.5 represented the best sorbent for the adsorption of phosphorus. In the experiment, the Langmuir model showed better fit with our data than the Freundlich model. CONCLUSION: This study indicate that the use of RCS in constructed wetlands or filter beds is a promising solution for phosphorus removal via adsorption and precipitation mechanisms.

본 연구는 철강산업에서 배출되는 산업폐기물의 일종인 페로니켈슬래그와 제강급랭슬래그의 인공습지나 여과시스템에서 인을 효과적으로 흡착 처리하기 위해 페로니켈슬래그와 제강급랭슬래그를 입경별(유효입경: 0.5 mm, 2.5 mm)로 구분하여 Freundlich 및 Langmuir 등온흡착실험을 통해 인에 대한 흡착특성을 조사하였다. Freundlich 등온흡착식에 의한 페로니켈슬래그(FNS)와 제강급랭슬래그(RCS)의 인 흡착능(K)은 RCS 0.5(0.5105) > RCS 2.5(0.3571) > FNS 2.5(0.0545) ${\fallingdotseq}$ FNS 0.5(0.0400) 순이었으며, 본 실험에 사용된 모든 슬래그의 흡착강도(1/n) 값이 0.19954-0.3657범위로 1보다 작으므로 모두 L형의 등온흡착식으로 판단 할 수 있었다. Langmuir 등온흡착식에 의한 인의 최대흡착능(a)은 FNS 0.5, FNS 2.5, RCS 0.5, RCS 2.5가 각각 320, 187, 3,582 및 2,983 mg/kg이었다. 슬래그의 실제 흡착량과 Freundlich와 Langmuir 등온흡착 일반식을 적용한 결과 실제 인의 흡착량은 전반적으로 Langmuir 등온흡착식이 Freundlich 등온흡착식에 비해서 잘 일치하였다. 이상의 결과를 미루어 볼 때, Freundlich와 Langmuir 등온흡착식을 이용한 슬래그의 인 흡착능력은 제강급랭슬래그(RCS)가 페로니켈슬래그(FNS)보다 높았으며, 고로급랭슬래그는 인공습지나 여과시스템에서 인 흡착을 위한 여재로 적용이 가능할 것으로 판단된다.

Keywords

References

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