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Phosphate Removal from Aqueous Solution according to Activation Methods of Red Mud  

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)
Publication Information
Journal of Korean Society on Water Environment / v.20, no.5, 2004 , pp. 466-472 More about this Journal
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
Activation of red mud; Phosphate; Removal;
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