Regeneration Effect of Fluoride-rich Granular Activated Alumina on Desorption Regent NaOH Solution
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 lmg/L outlet fluoride concentration.
adsorption regeneration defluoridation granular activated alumina
Baijie Niu Wenming Ding Dan Dang
College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
国际会议
杭州
英文
653-656
2013-01-18（万方平台首次上网日期，不代表论文的发表时间）