Arsenic Removal during Precipitative Softening
Publication: Journal of Environmental Engineering
Volume 123, Issue 5
Abstract
Because utilities with hard waters tend to have higher concentrations of arsenic, removal of arsenic via precipitative softening processes was investigated in the context of the more stringent proposed arsenic regulation. Arsenic removal can be facilitated by a variety of solids formed during softening including CaCO3, Mg(OH)2, Mn(OH)2, and Fe(OH)3. The extent of As(V) removal is decreased in the presence of orthophosphate and carbonate. As(III) removal is much lower than As(V) removal. At typical solids concentrations, arsenic removal followed a linear isotherm for CaCO3, Mg(OH)2, and Fe(OH)3, with constant percentage arsenic removal regardless of initial arsenic concentrations. However, for Mn(OH)2 solids arsenic removal was sensitive to arsenic concentrations. A framework for predicting arsenate removal when multiple solids form during softening is presented.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 123 • Issue 5 • May 1997
Pages: 453 - 460
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: May 1, 1997
Published in print: May 1997
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