A surface complexation model was developed to predict arsenate removal by ferric hydroxides in the presence of silica and natural organic matter. Modeling of arsenate removal in the presence of silica is improved somewhat by explicit consideration of both monomeric and dimeric silica species. Consistent with previous observations, the model simplifies to a linear isotherm under conditions present in many natural waters at pH ≤ 7.8 and if silica concentrations are relatively low. In waters at higher pHs with relatively high levels of silica, the model predicted that arsenate removal would be relatively insensitive to coagulant dose, but decreasing coagulation pH would produce very significant improvements to arsenate removal, as has been confirmed in practice.
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September 2005
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
September 01 2005
Using surface complexation modeling to assess the role of silica in arsenate adsorption onto metal oxides
Hsiao-wen Chen;
Hsiao-wen Chen
1Awwa Research Foundation, 6666 W Quincy Ave,Denver, CO, 80235-3098, USA
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Christina C. Davis;
Christina C. Davis
2Dept. Civil & Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
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Marc Edwards
3Department of Civil and Environmental Engineering, 407 Durham HallVirginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
Tel: +1 540 231 7236 Fax: +1 540 231 7916; E-mail: [email protected]
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Journal of Water Supply: Research and Technology-Aqua (2005) 54 (6): 339–348.
Article history
Received:
January 14 2005
Accepted:
April 21 2005
Citation
Hsiao-wen Chen, Christina C. Davis, Marc Edwards; Using surface complexation modeling to assess the role of silica in arsenate adsorption onto metal oxides. Journal of Water Supply: Research and Technology-Aqua 1 September 2005; 54 (6): 339–348. doi: https://doi.org/10.2166/aqua.2005.0032
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