Boron Removal via Formation of Magnesium Silicate Solids during Precipitative Softening
Publication: Journal of Environmental Engineering
Volume 133, Issue 2
Abstract
Precipitative softening is an option to remove silicon and boron from natural waters. Silicon was removed from hard waters by precipitative softening when the molar ratio of Mg:Si was less than 6:1 by the formation of an amorphous magnesium silicate. This solid had an apparent solubility product constant of and was stoichiometrically similar to the mineral forsterite, . Boron removal was consistent with sorption to this amorphous magnesium silicate and could be roughly described by a Freundlich isotherm: .
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Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant No. NSF0329474. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the National Science Foundation. The writers would also like to thank Philip Propes at the City of Ames, Iowa for his assistance with water sampling, Paolo Scardina for his SEM assistance, and Lucian Zelazny for his XRD assistance.
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Published In
Journal of Environmental Engineering
Volume 133 • Issue 2 • February 2007
Pages: 149 - 156
Copyright
© 2007 ASCE.
History
Received: Nov 16, 2005
Accepted: Jul 14, 2006
Published online: Feb 1, 2007
Published in print: Feb 2007
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