Behaviour of uranium in iron-bearing permeable reactive barriers: investigation with 237U as a radioindicator

Simon, Franz‐Georg; Segebade, Christian; Hedrich, Martina

doi:10.1016/s0048-9697(02)00548-x

Cited by 25 publications

(10 citation statements)

References 11 publications

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“…[13,14,15] Information regarding the mechanism of U(VI) removal by Fe 0 is confusing and even conflicting. [16][17][18] For example Cantrell et al [4] used thermodynamic calculations to predict reduction of U(VI) to U(IV) not only as a possible, but also as eventual dominant reaction pathway. This conclusion was experimentally supported by Abdelouas et al, [19] Farrell et al, [7] Gu et al [6] Based on the paper of Gu et al [6] a clear trend for "reductive precipitation of U(VI) by Fe 0 " can be observed in the recent literature.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of uranium removal from the aqueous solution by elemental iron

Noubactep¹,

Schöner

Meinrath

2006

Journal of Hazardous Materials

120

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The effectiveness of elemental iron (Fe 0 ) to remove uranium (U) from the aqueous phase has been demonstrated. While the mitigation effect is sure, discrepancies in the removal mechanism have been reported. The objective of this study was to investigate the mechanism of U(VI) removal from aqueous phases by Fe 0 . For this purpose a systematic sequence of bulk experiments was conducted to characterize the effects of the availability and the abundance of corrosion products on U(VI) removal. Results indicated that U(VI) removal reactions did not primary occur at the surface of the metallic iron. It is determined that U(VI) co-precipitation with aging corrosion products is a plausible explanation for the irreversible fixation under experimental conditions. Results of XRD analyses did no show any U phases, whereas SEM-EDX analyses showed that U tended to associate with rusted areas on the surface of Fe 0 .Recovering U with different leaching solutions varied upon the dissolution capacity of the individual solutions for corrosion products, showing that the irreversibility of the removal 2 depends on the stability of the corrosion products. U(VI) co-precipitation as removal mechanism enables a better discussion of reported discrepancies.

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Section: Introductionmentioning

confidence: 99%

Mechanism of uranium removal from the aqueous solution by elemental iron

Noubactep¹,

Schöner

Meinrath

2006

Journal of Hazardous Materials

120

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“…45 More recent work has been aimed at further elucidating the mechanisms of removal using radioindicators and evaluating PRBs in the field. 46 Zero-valent iron and iron-containing compounds, however, appear to be the most frequently used material in operational PRBs.…”

Section: Permeable Reactive Barriersmentioning

confidence: 99%

Treatment of uranium‐contaminated waters using organic‐based permeable reactive barriers

England¹

2006

Federal Facilities Envir J

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“…The findings of this paper have important implications for the design and long-term performance of phosphate based stabilization and reactive barrier techniques for groundwater remediation. The behavior of uranium in iron-bearing permeable reactive barriers was assessed using U (237) as a radio-indicator (Simon et al, 2003). The reaction between iron and uranium was found to follow first-order kinetics and a stoichiometric ratio of uranium to iron was approximately 1:1390.…”

Section: Radioactive Metalsmentioning

confidence: 99%

Groundwater Quality

Lange¹,

Lange²

2004

Water Environment Research

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This review covers studies related to groundwater quality and has been arranged by contaminant type. For each contaminant the quantity, fate and transport, remediation measures, and models published over the past year are presented. FLOWA methodology for stochastic management of groundwater flow and quality was presented by Bakr et al (2003) using coupled flow and mass transport equations. Using a multi-objective formulation of the management problem and analysis of its results, it was possible to identify an appropriate remediation scheme. A mathematical model for solute transport, using a laplace transform power series, was used to describe solute transport in a convergent flow field with scale-dependent dispersion (Chen et al, 2003a). The model results showed good agreement with field data. Woods et al (2003) showed that numerical error in groundwater transport models could lead to quantitative and qualitative changes in behavior. The authors confirmed this finding by showing 2190 the Elder problem to be extremely sensitive to the simulation method used. Nonreactive transport at the boarder of various asymmetrical cavities was modeled by Selvadurai (2003). Analytical results were developed for time-and spacedependent distribution of contaminant concentration in porous media, which can also exhibit natural attenuation.A block-effective macrodispersion model was used to simulate transport in heterogeneous aquifers (Rubin et al, 2003). The closed-form analytical results were attained very quickly. Das and Nassehi (2003) modeled contaminant mobility in the subsurface domains with multiple free/porous interfaces. The authors attempted to remove the limitations of previous mathematical models by imposing multiple pervious boundaries. The effects local-scale heterogeneity and non-linear, kinetically limited sorption phenomena on contaminant transport in porous media was discussed by Johnson et al (2003a). The results indicated that local-scale physical heterogeneity controlled the non-ideal transport behavior of trichloroethene and non-ideal sorption was of secondary importance. The flow behavior of liquid carbon tetrachloride in unsaturated heterogeneous porous media was studied by Oostrom et al (2003). The results indicate that nonspreading behavior of NAPLs should be implemented in simulators to account for the formation of residual saturations. A dependence of DNALP behavior on saturation history was demonstrated by Gerhard and Kueper (2003) using laboratory scale testing. Laboratory and numerical modeling investigations of flow and transport near a seepage face boundary was conducted by Simpson et al (2003a). The 2191 authors concluded that the use of the Dupuit approximations might introduce error into the analysis of localized solute transport near the seepage face.Anderson applied an approximation that replaced the leaky boundary with an equivalent layer that had a one-dimensional resistance to flow. The solution compared favorably with the commonly utilized Dupuit approximation.A model for unsaturated flow...

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Behaviour of uranium in iron-bearing permeable reactive barriers: investigation with 237U as a radioindicator

Cited by 25 publications

References 11 publications

Mechanism of uranium removal from the aqueous solution by elemental iron

Mechanism of uranium removal from the aqueous solution by elemental iron

Treatment of uranium‐contaminated waters using organic‐based permeable reactive barriers

Groundwater Quality

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