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Towards a consistent geochemical model for prediction of uranium(VI) removal from groundwater by ferrihydrite
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Environmental Geochemistry and Ecotechnology.ORCID iD: 0000-0001-8771-7941
Swedish University of Agricultural Sciences.
Örebro University.
2009 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 24, no 3, 454-462 p.Article in journal (Refereed) Published
Abstract [en]

Uranium(VI), which is often elevated in granitoidic groundwaters, is known to adsorb strongly to Fe (hydr)oxides under certain conditions. This process can be used in water treatment to remove U(VI). To develop a consistent geochemical model for U(VI) adsorption to ferrihydrite, batch experiments were performed and previous data sets reviewed to optimize a set of surface complexation constants using the 3-plane CD-MUSIC model. To consider the effect of dissolved organic matter (DOM) on U(VI) speciation, new parameters for the Stockholm Humic Model (SHM) were optimized using previously published data. The model, which was constrained from available X-ray absorption fine structure (EXAFS) spectroscopy evidence, fitted the data well when the surface sites were divided into low- and high-affinity binding sites. Application of the model concept to other published data sets revealed differences in the reactivity of different ferrihydrites towards U(VI). Use of the optimized SHM parameters for U(VI)-DOM complexation showed that this process is important for U(VI) speciation at low pH. However in neutral to alkaline waters with substantial carbonate present, Ca-U-CO3 complexes predominate. The calibrated geochemical model was used to simulate U(VI) adsorption to ferrihydrite for a hypothetical groundwater in the presence of several competitive ions. The results showed that U(VI) adsorption was strong between pH 5 and 8. Also near the calcite saturation limit, where U(VI) adsorption was weakest according to the model, the adsorption percentage was predicted to be >80%. Hence U(VI) adsorption to ferrihydrite-containing sorbents may be used as a method to bring down U(VI) concentrations to acceptable levels in groundwater.

Place, publisher, year, edition, pages
Elsevier, 2009. Vol. 24, no 3, 454-462 p.
Keyword [en]
nica-donnan model, iron-coated sands, surface complexation, humic, substances, charge-distribution, earth-elements, binding model, silicic-acid, ion-binding, adsorption
National Category
URN: urn:nbn:se:kth:diva-18293DOI: 10.1016/j.apgeochem.2008.12.032ISI: 000264577400010ScopusID: 2-s2.0-60349113499OAI: diva2:336339

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2015-03-24Bibliographically approved

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