دورية أكاديمية
أعرض في EDS

Uncertainty and variability in laboratory derived sorption parameters of sediments from a uranium in situ recovery site.

التفاصيل البيبلوغرافية
العنوان: Uncertainty and variability in laboratory derived sorption parameters of sediments from a uranium in situ recovery site.
المؤلفون: Dangelmayr MA; Department of Civil and Environmental Engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph St, Rapid City, SD 57701, USA; Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St, Golden, CO 80401, USA., Reimus PW; Los Alamos National Laboratory, Bikini Atoll Rd., SM 30, Los Alamos, NM 87545, USA., Johnson RH; Navarro Research and Engineering, Inc., 2597 Legacy Way, Grand Junction, CO 81503, USA., Clay JT; Power Resources Inc., Smith Ranch-Highland Operation, 762 Ross Road, Douglas, WY 82633, USA., Stone JJ; Department of Civil and Environmental Engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph St, Rapid City, SD 57701, USA. Electronic address: james.stone@sdsmt.edu.
المصدر: Journal of contaminant hydrology [J Contam Hydrol] 2018 Jun; Vol. 213, pp. 28-39. Date of Electronic Publication: 2018 Apr 18.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: Elsevier Country of Publication: Netherlands NLM ID: 8805644 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-6009 (Electronic) Linking ISSN: 01697722 NLM ISO Abbreviation: J Contam Hydrol Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Amsterdam ; New York : Elsevier, [c1986-
مواضيع طبية MeSH: Geologic Sediments/*chemistry , Uranium/*analysis , Water Pollutants, Chemical/*analysis , Water Pollutants, Radioactive/*analysis, Adsorption ; Calcium Carbonate/chemistry ; Hydrogen-Ion Concentration ; Hydrology/methods ; Kinetics ; Models, Theoretical ; Uncertainty ; Uranium/chemistry ; Water Pollutants, Chemical/chemistry ; Water Pollutants, Radioactive/chemistry ; Wyoming ; X-Ray Diffraction
مستخلص: This research assesses the ability of a GC SCM to simulate uranium transport under variable geochemical conditions typically encountered at uranium in-situ recovery (ISR) sites. Sediment was taken from a monitoring well at the SRH site at depths 192 and 193 m below ground and characterized by XRD, XRF, TOC, and BET. Duplicate column studies on the different sediment depths, were flushed with synthesized restoration waters at two different alkalinities (160 mg/l CaCO 3 and 360 mg/l CaCO 3 ) to study the effect of alkalinity on uranium mobility. Uranium breakthrough occurred 25% - 30% earlier in columns with 360 mg/l CaCO 3 over columns fed with 160 mg/l CaCO 3 influent water. A parameter estimation program (PEST) was coupled to PHREEQC to derive site densities from experimental data. Significant parameter fittings were produced for all models, demonstrating that the GC SCM approach can model the impact of carbonate on uranium in flow systems. Derived site densities for the two sediment depths were between 141 and 178 μmol-sites/kg-soil, demonstrating similar sorption capacities despite heterogeneity in sediment mineralogy. Model sensitivity to alkalinity and pH was shown to be moderate compared to fitted site densities, when calcite saturation was allowed to equilibrate. Calcite kinetics emerged as a potential source of error when fitting parameters in flow conditions. Fitted results were compared to data from previous batch and column studies completed on sediments from the Smith-Ranch Highland (SRH) site, to assess variability in derived parameters. Parameters from batch experiments were lower by a factor of 1.1 to 3.4 compared to column studies completed on the same sediments. The difference was attributed to errors in solid-solution ratios and the impact of calcite dissolution in batch experiments. Column studies conducted at two different laboratories showed almost an order of magnitude difference in fitted site densities suggesting that experimental methodology may play a bigger role in column sorption behavior than actual sediment heterogeneity. Our results demonstrate the necessity for ISR sites to remove residual pCO2 and equilibrate restoration water with background geochemistry to reduce uranium mobility. In addition, the observed variability between fitted parameters on the same sediments highlights the need to provide standardized guidelines and methodology for regulators and industry when the GC SCM approach is used for ISR risk assessments.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
فهرسة مساهمة: Keywords: In-situ recovery; Surface complexation modeling; Transport modeling; Uranium adsorption
المشرفين على المادة: 0 (Water Pollutants, Chemical)
0 (Water Pollutants, Radioactive)
4OC371KSTK (Uranium)
H0G9379FGK (Calcium Carbonate)
تواريخ الأحداث: Date Created: 20180426 Date Completed: 20190513 Latest Revision: 20190513
رمز التحديث: 20231215
DOI: 10.1016/j.jconhyd.2018.04.001
PMID: 29691066
قاعدة البيانات: MEDLINE
الوصف
تدمد:1873-6009
DOI:10.1016/j.jconhyd.2018.04.001