environmental-remediation-technologies-sustainability-plan-for-the-am-area-groundwater-remediation-system

Environmental Remediation Science & Technology: Surface Water Modeling of Tims Branch

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Environmental Remediation Science & Technology: Remediation Research and Technical Support for Savannah River Site

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Rapid Deployment of Engineered Solutions to Environmental Problems: Investigation of Microbial-Meta-Autunite Interactions – Effect of Bicarbonate and Calcium

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Environmental Remediation Science & Technology: Sequestering Uranium at the Hanford 200 Area Vadose Zone by In Situ Subsurface pH Manipulation Using NH3 Gas

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Rapid Deployment of Engineered Solutions for Environmental Problems at Hanford – FIU’s Support for Uranium Remediation at the Hanford Site

Uranium has been recognized as one of the most widespread groundwater contaminants at the U.S. Department of Energy’s (DOE) Hanford site, Washington State. In oxidized groundwater conditions that are typically present at the Hanford site, soluble uranyl ion (UO22+) creates strong complexes with carbonate and Ca2UO2(CO3)3o and UO2(CO3)22- are the predominant U(VI) aqueous species. The concentration of uranium exceeds the maximum contaminant level for drinking water of 30 μg/L required…

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Effects of Bicarbonate on the Microbial Dissolution of Meta-Autunite

Injections of a soluble sodium tripolyphosphate amendment into uranium-contaminated groundwater and soil have been shown to effectively sequester uranium through the formation of insoluble uranyl phosphate minerals. Polyphosphate undergoes hydrolysis in aqueous solutions to orthophosphate forms, which serve as readily available nutrients for the various micro-organisms that thrive under these specific conditions and may even lead to an increase in their growth. Microbial activities in many environmental systems are additional…

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Sequestering Uranium at the Hanford 200 Area Vadose Zone by in Situ Subsurface pH Manipulation Using NH3

Characterization of vadose zone (VZ) soil at the 200 Area has identified a number of radiological and hazardous contaminants, including technetium and uranium. This work is focusing on long-lived uranium contamination, which is one of the key contaminants of concern that needs to be reduced to below levels that can cause harm to human health and the environment. Injection of reactive gases such as NH3, is an innovative remediation technology…

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Rapid Deployment of Engineered Solutions for Environmental Problems at Hanford

The investigation targets uranium (U) contamination in the vadose zone (VZ) of the 200 Area that may affect potential discharges to the Columbia River via groundwater migration. Injection of reactive gases such as NH3 is an innovative technology that targets U contamination in the VZ to reduce the potential for radionuclides mobility in subsurface. The alkaline conditions can greatly enhance the solubility of most Al- and Si-containing minerals by many…

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Modeling of Groundwater Flow and Contaminant Transport at the Moab Site

In order to reduce contaminant mass in the groundwater system and to be protective of potential endangered fish habitat in backwater areas of the river, the model will be used to simulate the following remedial actions proposed by DOE: (i) Pumping contaminated groundwater from the shallow plume to an evaporation pond on top of the tailings pile, and (ii) Injecting the diverted Colorado River water into the alluvial aquifer. The…

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