Journal of Environment and Safety
Online ISSN : 2186-3725
Print ISSN : 1884-4375
ISSN-L : 1884-4375
Original article
Treatment of fluoride ion after the decomposition of refractory tetrafluoroborate ion by the addition of aluminum ion
Etsu YamadaHikari ShimizuYasuro Fuse
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2014 Volume 5 Issue 3 Pages 191-198

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Abstract

Fluoride ion in the mixed solutions of fluoride and tetrafluoroborate ions can be analyzed without the interference of aluminum ion with fluoride ion-selective electrode using Gran's plot method after the decomposition of refractory tetrafluoroborate ion. Tetrafluoroborate ion was stable at room temperature under neutral and alkaline conditions and its 20% was remaining even at pH 3 after 2 months. However, tetrafluoroborate ion was decomposed almost quantitatively after 48h by aluminum addition in the pH 3-4. This indicated that tetrafluoroborate ion was quickly decomposed by adding an aluminum compound to form fluoroaluminate.After the decomposition of tetrafluoroborate ion, fluoride ion in even wastewater from the scrubber of organic waste-liquid treatment facility was removed to meet the effluent standard (8ppm) using two-step treatment method by combining precipitation of fluoride with calcium and fluoride adsorption resin column.

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© 2014 Academic Consociation of Environmental Safety and Waste Management,Japan
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