Arsenic removal during precipitative softening
Journal Article
·
· Journal of Environmental Engineering
- Univ. of Colorado, Boulder, CO (United States)
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 CaCO{sub 3}, Mg(OH){sub 2}, Mn(OH){sub 2}, and Fe(OH){sub 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 CaCO{sub 3}, Mg(OH){sub 2}, and Fe(OH){sub 3}, with constant percentage arsenic removal regardless of initial arsenic concentrations. However, for Mn(OH){sub 2} solids arsenic removal was sensitive to arsenic concentrations. A framework for predicting arsenate removal when multiple solids form during softening is presented.
- Sponsoring Organization:
- Environmental Protection Agency, Washington, DC (United States)
- OSTI ID:
- 495406
- Journal Information:
- Journal of Environmental Engineering, Journal Name: Journal of Environmental Engineering Journal Issue: 5 Vol. 123; ISSN 0733-9372; ISSN JOEEDU
- Country of Publication:
- United States
- Language:
- English
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