scholarly journals Predictive geochemical modeling of interactions between uranium-mill-tailings solutions and sediments in a flow-through system: model formulations and preliminary results

1983 ◽  
Author(s):  
S.R. Peterson ◽  
A.R. Felmy ◽  
R.J. Serne ◽  
G.W. Gee
Keyword(s):  
Geochemical Modeling ◽  
System Model ◽  
Preliminary Results ◽  
Mill Tailings ◽  
Flow Through ◽  
Uranium Mill Tailings

Geochemistry of uranium mill tailings in the Athabasca Basin, Saskatchewan, Canada: A review

2019 ◽  
Vol 49 (14) ◽  
pp. 1237-1293 ◽  
Author(s):  
Jared Robertson ◽  
M. Jim Hendry ◽  
T. Kotzer ◽  
Kebbi A. Hughes
Keyword(s):  
Athabasca Basin ◽  
Mill Tailings ◽  
Uranium Mill Tailings

Screening of bacterial strains isolated from uranium mill tailings porewaters for bioremediation purposes

2017 ◽  
Vol 166 ◽  
pp. 130-141 ◽  
Author(s):  
Iván Sánchez-Castro ◽  
Ahinara Amador-García ◽  
Cristina Moreno-Romero ◽  
Margarita López-Fernández ◽  
Vannapha Phrommavanh ◽  
...  
Keyword(s):  
Bacterial Strains ◽  
Mill Tailings ◽  
Uranium Mill Tailings

scholarly journals Diversity and Characterization of Sulfate-Reducing Bacteria in Groundwater at a Uranium Mill Tailings Site

2001 ◽  
Vol 67 (7) ◽  
pp. 3149-3160 ◽  
Author(s):  
Yun-Juan Chang ◽  
Aaron D. Peacock ◽  
Philip E. Long ◽  
John R. Stephen ◽  
James P. McKinley ◽  
...  
Keyword(s):  
Natural Attenuation ◽  
Phospholipid Fatty Acid ◽  
Sulfate Reducing Bacteria ◽  
Activity Level ◽  
Disposal Site ◽  
Sulfate Reducing ◽  
Mill Tailings ◽  
Biomarker Analysis ◽  
Reducing Bacteria ◽  
Uranium Mill Tailings

ABSTRACT Microbially mediated reduction and immobilization of U(VI) to U(IV) plays a role in both natural attenuation and accelerated bioremediation of uranium-contaminated sites. To realize bioremediation potential and accurately predict natural attenuation, it is important to first understand the microbial diversity of such sites. In this paper, the distribution of sulfate-reducing bacteria (SRB) in contaminated groundwater associated with a uranium mill tailings disposal site at Shiprock, N.Mex., was investigated. Two culture-independent analyses were employed: sequencing of clone libraries of PCR-amplified dissimilatory sulfite reductase (DSR) gene fragments and phospholipid fatty acid (PLFA) biomarker analysis. A remarkable diversity among the DSR sequences was revealed, including sequences from δ-Proteobacteria, gram-positive organisms, and theNitrospira division. PLFA analysis detected at least 52 different mid-chain-branched saturate PLFA and included a high proportion of 10me16:0. Desulfotomaculum andDesulfotomaculum-like sequences were the most dominant DSR genes detected. Those belonging to SRB within δ-Proteobacteria were mainly recovered from low-uranium (≤302 ppb) samples. OneDesulfotomaculum-like sequence cluster overwhelmingly dominated high-U (>1,500 ppb) sites. Logistic regression showed a significant influence of uranium concentration over the dominance of this cluster of sequences (P = 0.0001). This strong association indicates that Desulfotomaculum has remarkable tolerance and adaptation to high levels of uranium and suggests the organism's possible involvement in natural attenuation of uranium. The in situ activity level of Desulfotomaculum in uranium-contaminated environments and its comparison to the activities of other SRB and other functional groups should be an important area for future research.

Sustainable Covers for Uranium Mill Tailings, USA: Alternative Design, Performance, and Renovation

2009 ◽  
Author(s):  
William J. Waugh ◽  
Craig H. Benson ◽  
William H. Albright
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Department Of Energy ◽  
Test Facility ◽  
Sagebrush Steppe ◽  
Natural Soil ◽  
Structural Development ◽  
Percent Cover ◽  
Mill Tailings ◽  
Uranium Mill Tailings

The U.S. Department of Energy Office of Legacy Management is investigating alternatives to conventional cover designs for uranium mill tailings. A cover constructed in 2000 near Monticello, Utah, USA, was a redundant design with a conventional low-conductivity composite cover overlain with an alternative cover designed to mimic the natural soil water balance as measured in nearby undisturbed native soils and vegetation. To limit percolation, the alternative cover design relies on a 160-cm layer of sandy clay loam soil overlying a 40-cm sand capillary barrier for water storage, and a planting of native sagebrush steppe vegetation to seasonally release soil water through evapotranspiration (ET). Water balance monitoring within a 3.0-ha drainage lysimeter, embedded in the cover during construction, provided convincing evidence that the cover has performed well over a 9-year period (2000–2009). The total cumulative percolation, 4.8 mm (approximately 0.5 mm yr−1), satisfied a regulatory goal of <3.0 mm yr−1. Most percolation can be attributed to the very wet winter and spring of 2004–2005, when soil water content exceeded the storage capacity of the cover. Diversity, percent cover, and leaf area of vegetation increased over the monitoring period. Field and laboratory evaluations several years after construction show that soil structural development, changes in soil hydraulic properties, and development of vegetation patterns have not adversely impacted cover performance. A new test facility was constructed in 2008 near Grand Junction, Colorado, USA, to evaluate low-cost methods for renovating or transforming conventional covers into more sustainable ET covers.

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