Precipitation Removal of Fluoride from Semiconductor Wastewater
Publication: Journal of Environmental Engineering
Volume 133, Issue 4
Abstract
Chemical precipitation method utilizing calcium salts has been extensively used to treat fluoride-containing wastewater from semiconductor manufacturers. The major objective of this study was to investigate coagulation-flocculation of calcium fluoride precipitates . Residual fluoride concentration of lower than , the effluent standard, was found when molar ratio of calcium to fluoride, , was 0.5 and pH ranged from 6.5 to 8.5. The fine precipitates of were further flocculated by polyaluminum chloride (PAC) and anionic polyelectrolyte, polyacrylic acid (PAA) with different molecular weight, to facilitate better solid-liquid separation. Experimental results indicated that both PAC and PAA with low to medium molecular weight could remove precipitates effectively. Satisfactory removal efficiency was achieved at lower dosage when PAC and PAA were used in combination. Recycling of precipitates or sludge did not enhance removal of fluoride or precipitates. Reaction mechanisms were discussed based on zeta potential and particle size distribution.
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Acknowledgments
The writers wish to thank the National Science Council of Taiwan for financial support of the work through Project No. NSC NSCT91-2211-E-011-011.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 133 • Issue 4 • April 2007
Pages: 419 - 425
Copyright
© 2007 ASCE.
History
Received: Feb 14, 2006
Accepted: Oct 9, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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