| Title |
Treatment Characteristics of Fluoride Wastewater by Waste Gypsum as a Precipitant |
| Authors |
김성준 ( Sung Joon Kim ) ; 전용태 ( Yong Tae Jeon ) ; 원찬희 ( Chan Hee Won ) |
| Keywords |
Fluoride; Lime; Precipitation; Waste gypsum; XRD analysis |
| 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 SO3, SiO2. 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). |