Regeneration Effect of Fluoride-Rich Granular Activated Alumina on Desorption Regent NaOH Solution

Abstract:

As an effective adsorbent, granular activated alumina (GAA) has been widely used in defluoridation. In order to reduce cost and operate environment-friendly, the adsorbent should be regenerated. In this paper, column experiment was done to characterize the fluoride removal properties and to develop an optimal method to regenerate fluoride-rich modified activated alumina (MGAA). The MGAA can be regenerated by utilizing sodium hydroxide solution desorption, deionized water washing and ferric sulfate reactivation and then used for futher defluoride operation. The influence of the concentration of desorption agent (NaOH solution) and desorbing time on desorption rate and the adsorption capacity of regenerated MGAA were studied. The optimal desorption condition was: 1% NaOH solution for desorption agent, desorbing time in 1.5h.In addition, when the regenerated MGAA was used again for column adsorption test, its adsorption capacity reached 94% of that of original sorbent in 1mg/L outlet fluoride concentration.

• Periodical: Applied Mechanics and Materials (Volumes 316-317)
• Pages: 653-656
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.316-317.653
• Online since: April 2013
• Authors: Bai Jie Niu, Wen Ming Ding, Dan Dang
• Keywords: Adsorption, Defluoridation, Granular Activated Alumina, Regeneration

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