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Effects of $CaF_2$ dosage, pH and Treated Water Recirculation on Fluoride Removal in Treating Semiconductor Wastewater with Fluidized bed Reactor (FBR)  

An, Myeong-Ki (Department of Environmental Engineering, Chungbuk National University)
Kim, Jin-Sik (Department of Environmental Engineering, Chungbuk National University)
Kim, Keum-Yong (Department of Environmental Engineering, Chungbuk National University)
Ryu, Hong-Duck (Department of Environmental Engineering, Chungbuk National University)
Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.6, 2010 , pp. 593-598 More about this Journal
Abstract
The optimum condition for fluoride removal, water content reduction, and $CaF_2$ purity was determined in treating semiconductor waste water in which ammonia nitrogen, phosphorus, and fluoride are existed simultaneously using a fluidized bed reactor. Effects of pH, seed dosage, and recirculation of treated water were investigated through lab-scale experiments. Considering fluoride removal, sludge purity, and water content, that pH 5 and seed dose of 150 g were found to be optimum. Correspondingly, removal of fluoride and phosphate (${PO_4}^{3-}$-P) was 94.24% and 8.97%, respectively, with water content ratio of 12.94%. Increase in an amount of seed dosage not only enhance fluoride removal efficiency, but also buffer fluoride removal-reducing effect due to the variation of recirculation ratio of treated water and pH.
Keywords
Fluidized Bed Reactor; Calcium Fluoride; Fluoride Removal; Semiconductor Wastewater; Water Content; Seed Dose;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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