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Inhibition Effects of $Ca^{2+}$ and $F^-$ Ion on Struvite Crystallization  

Kim, Seung-Ha (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.7, 2010 , pp. 730-737 More about this Journal
Abstract
It is very important to remove fluoride ion before treating semiconductor wastewater containing high concentration of ammonia, phosphates, and fluoride ions by struvite formation. Calcium ion was generally added for the removal of fluoride ion. However, calcium ions remained after removal of fluoride ion can deteriorate the performance of struvite crystalization. It should be removed completely before struvite formation. In this study, the effect of fluoride and calcium ion concentration on the struvite crystalization was investigated. Removal efficiencies of ortho-phosphate with struvite formation were more abruptly decreased than those of ammonium nitrogen, as increase of fluoride ion concentration in synthetic wastewater. The structures of struvite formed in synthetic wastewater containing calcium ion of up to 500 mg/L were identical. Purity of struvite was deteriorated as increase of calcium ion over 500 mg/L. Removal efficiencies of ammonium nitrogen were more decreased than those of phosphate ions as increase of cacium ion in synthetic wastewater.
Keywords
Struvite Crystallization Reaction; Fluorine; Calcium; Orthophosphate; Nitrogen;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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