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A Study on the Removal of Low-concentration Fluoride-ion by Modified Alumina  

Kim, So-Young (Clean Technology Research Center, Korea Institute Science and Technology, Department of Chemical Engineering)
Kim, Ju-Hee (Clean Technology Research Center, Korea Institute Science and Technology, Department of Chemical Engineering)
Kim, Hyoun-Ja (Clean Technology Research Center, Korea Institute Science and Technology, Department of Chemical Engineering)
Cho, Young-Sang (Clean Technology Research Center, Korea Institute Science and Technology, Department of Chemical Engineering)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.3, 2005 , pp. 247-252 More about this Journal
Abstract
The typical treatment method for fluoride polluted water is the flocculation and precipitation method which usually is capable of reducing the fluoride concentration down to the level of about 10 ppm. However, this method is no longer effective for the treatment of contaminated water having less than 10 ppm of fluorides. To remove fluorides in polluted water from the fluoride concentration between 1 to 10 ppm, several adsorbents were prepared mainly based on an activated alumina and the fluoride removal efficiencies of the adsorbents were analyzed. The best fluoride removal efficiency was obtained when the activated alumina treated by sulfuric acid was used as the adsorbent. A proper calcination temperature for the sulfuric acid contained activated alumina was found to be about $500^{\circ}C$. An adsorption isotherm for the adsorbent was also obtained by using Freundlich model. The values of the constants in Freundlich isotherm model were calculated to be K=6.63 and 1/n=0.29 based on the results obtained from the series of batch type adsorption experiments.
Keywords
Modified Alumina; Fluoride-Ion; Isotherm of Freundlich;
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