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Treatment Characteristics of Fluoride Wastewater by Waste Gypsum as a Precipitant  

Kim, Sung-Joon (Department of Environmental Engineering, Chonbuk National University)
Jeon, Yong-Tae (Department of Environmental Engineering, Chonbuk National University)
Won, Chan-Hee (Department of Environmental Engineering, Chonbuk National University)
Publication Information
Journal of Korean Society on Water Environment / v.26, no.6, 2010 , pp. 919-925 More about this Journal
Abstract
The features of precipitating reaction of fluoride have been examined by employing waste gypsum as a precipitant. The major component of waste gypsum was examined to be CaO with minor components of $SO_3$, $SiO_2$. In the experimental condition, the precipitating reaction of fluoride progressed rapidly within a few minutes after the reaction started and reached its equilibrium in 10 minutes. Kinetic analysis showed that the precipitating reaction of fluoride generally followed a first Oder and second Oder with decreasing rate constant with the initial dosage of precipitant. XRD analysis showed that the crystalline structure of precipitate was mainly $CaF_2$ with partly $Ca_5(PO_4)_3(OH)$.
Keywords
Fluoride; Lime; Precipitation; Waste gypsum; XRD analysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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