Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Phosphate Removal from Aqueous Solution according to Activation Methods of Red Mud

알루미늄 제련 폐기물(Red Mud)의 활성화 방법에 따른 수용상의 인산염 제거특성

  • Kim, I-Tae (Korea Institute of Construction Technology) ;
  • Bae, Woo-keun (Hanyang University Department of Civil & Environmental Systems Engineering) ;
  • Kim, Woo-jeong (Korea Institute of Construction Technology)
  • 김이태 (한국건설기술연구원 건설환경연구부) ;
  • 배우근 (한양대학교건설환경시스템공학과) ;
  • 김우정 (한국건설기술연구원 건설환경연구부)
  • Received : 2004.06.11
  • Accepted : 2004.07.15
  • Published : 2004.09.30
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Abstract

Red mud is formed as a waste during bauxite refining known as Bayer's process. Its main constituents are iron, aluminium, sodium and silica. The disposal of large quantities of wasted red mud causes a serious ecological problem. In this study, the red mud wasted from the bauxite refinery was studied for phosphate removal from aqueous solution according to activation methods. The influence of heat treatment, and neutralization with sea water and acid treatment level for the optimum conditions for phosphate removal have been determined. Heat treatment combined with acid treatment is most suitable for the removal of phosphate from aqueous solution. The optimal condition was activated with 1 N HCl solution after heating in $600^{\circ}C$ during 4 hours. Acid and heat treatment causes sodalite compounds which hinder the phosphate adsorption to leach out. The adsorption data obtained followed a first-order rate expression and fitted well with the Freundlich Isotherm well.

Keywords

References

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