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Mechanisms of CCl4 Retention and Slow Release in Model Porous Solids and Sediments

Description: This work is part of a larger collaborative project of the same title led by Robert Riley at PNNL. Our task goal is to use a state of the art microbalance and well-defined mesoporous silica particles to characterize the effects of pore size distribution on carbon tetrachloride release rate and sequestration. Mesoporous silicon dioxide (SiO2) particles with pore size distribution in the range of 20 to 70 Angstroms were synthesized under acidic conditions using nonionic surfactants as structure d… more
Date: June 1, 2003
Creator: Peyton, Brent M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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DETERMINATION AND QUANTIFICATION OF NON-AQUEOUS PHASE LIQUID MIXTURES IN ENVIRONMENTAL MEDIA

Description: It is important to recognize the presence of Non-Aqueous Phase Liquids (NAPLs) in soils at a waste site in order to design and construct a successful remediation system. NAPLs often manifest as a complex, multi-component mixture of organic compounds that can occur in environmental media, such as vadose zone soil, where the mixture will partition and equilibrate with soil particles, pore vapor, and pore water. Complex organic mixtures can greatly complicate the determination and quantification o… more
Date: September 22, 2006
Creator: Rucker, G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Atmospheric Aerosol Source-Receptor Relationships: The Role of Coal-Fired Power Plants

Description: This report describes the technical progress made on the Pittsburgh Air Quality Study (PAQS) during the period of September 2003 through February 2004. Significant progress was made this project period on the analysis of ambient data, source apportionment, and deterministic modeling activities. Results highlighted in this report include chemical fractionation of the organic fraction to quantify the ratio of organic mass to organic carbon (OM/OC). The average OM/OC ratio for the 31 samples analy… more
Date: April 1, 2004
Creator: Robinson, Allen L.; Pandis, Spyros N. & Davidson, Cliff I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A NOVEL APPROACH TO CATALYTIC DESULFURIZATION OF COAL

Description: Column chromatographic separation of the S=PBu{sub 3}/PBu{sub 3} product mixture followed by weighing the S=PBu{sub 3}, and by vacuum distillation of S=PBu{sub 3}/PBu{sub 3}mixture followed by gas chromatographic analysis are described. Effects of coal mesh size, pre-treatment with methanol Coal (S) + excess PR{sub 3} {yields} Coal + S=PR{sub 3}/PBu{sub 3} and sonication on sulfur removal by PBu{sub 3} revealed that particle size was not observed to affect desulfurization efficiency in a consis… more
Date: November 1, 2001
Creator: Verkade, John G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of material disposition for Illinois {number_sign}6 coal POC testing at the CFFF

Description: The Illinois No.6 coal Proof-of-Concept (POC) bottoming cycle testing began in August of 1987 with test LMF4K. POC testing of this coal was completed in November of 1990 with test LMF4V, and included a total of over 2003 hours of coal-fired operation. This testing was conducted to permit the evaluation of effects of long duration operation on a number of critical design issues. During all of the POC testing, all Heat-Recovery/Seed Recovery (HRSR) components, with the exception of the wet electr… more
Date: June 1, 1993
Creator: Jackson, D. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Controlling Mercury Release from Source Zones to Surface Water: Initial Results of Pilot Tests at the Y-12 National Security Complex

Description: This report presents initial results obtained during year 2008 and satisfies a deliverable listed in the work breakdown structure (WBS) element OR081301. Broad objectives of the multi-year project are: (1) evaluation of remediation technologies for waterborne mercury, (2) development of treatment methods for soil mercury, and (3) source identification, characterization and analyses to improve mass balance on mercury estimates. This report presents the results of pilot tests, conducted in summer… more
Date: January 1, 2009
Creator: Southworth, George R; Brooks, Scott C; Peterson, Mark J; Bogle, Mary Anna; Miller, Carrie L; Liang, Liyuan et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Overcoming Barriers to the Remediation of Carbon Tetrachloride Through Manipulation of Competing Reaction Mechanisms

Description: Quantify the kinetics of all competing product-formation pathways, over a range of conditions relevant to groundwater remediation, using well-mixed batch reactors and analysis primarily by chromatography. At OGI, batch experiments were conducted on Fe(0) systems (both Fisher Electrolytic and Nano-sized iron). The experiments were done with and without buffer. The buffered experiments tried to contrast two buffers: an organic buffer (EPPS, presumably a H atom donor), and the inorganic borate. In… more
Date: June 1, 2003
Creator: Tratnyek, Paul G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Constraining uncertainties about the sources and magnitude of ambient air exposures to polycyclic aromatic hydrocarbons (PAHs): The state of Minnesota as a case study

Description: Emissions data are often lacking or uncertain for many airborne contaminants. Chemicals, such as polycyclic aromatic hydrocarbons (PAHs), emitted from combustion sources, fall into this category. Currently available ambient-air emission inventories of PAHs either fail to account for population-based activities (such as residential wood combustion and motor vehicle activity) and/or report ''total PAH'' or particulate organic matter emissions instead of individual compounds. We measure the degree… more
Date: February 1, 2004
Creator: Lobscheid, Agnes B. & McKone, Thomas E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Genetic Engineering of Plants to Improve Phytoremediation of Chlorinated Hydrocarbons in Groundwater

Description: I. Mechanism of halogenated hydrocarbon oxidation We are using poplar culture cells to determine the pathway of TCE metabolism. In our earlier work, we found that trichloroethanol (TCEOH) is a major early intermediate. Our studies this year have focused on the steps that follow this toxic intermediate. We did several experiments to track the disappearance of TCEOH after the cells were removed from TCE. We could conclude that TCEOH is not an end-product but is rapidly degraded. Six flasks of pop… more
Date: December 1, 2004
Creator: Strand, Stuart E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Order-of-Magnitude Estimation of Benzene Concentration in Saltstone Vault

Description: The contents of Tank 48H that include the tetraphenylborate (TPB) precipitates of potassium and cesium will be grouted and stored in the Saltstone vault. The grouting process is exothermic, which should accelerate the rate of decomposition of TPB precipitates eventually to benzene. Because the vault is not currently outfitted with an active ventilation system, there is a concern that a mixture of flammable gases may form in the vapor space of each cell filled with the curing grout. The purpose … more
Date: March 20, 2006
Creator: Choi, A. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Oxalate Mass Balance During Chemical Cleaning in Tank 5F

Description: The Savannah River Site (SRS) is preparing Tank 5F for closure. The first step in preparing the tank for closure is mechanical sludge removal. Following mechanical sludge removal, SRS performed chemical cleaning with oxalic acid to remove the sludge heel. Personnel are currently assessing the effectiveness of the chemical cleaning to determine whether the tank is ready for closure. SRS personnel collected liquid samples during chemical cleaning and submitted them to Savannah River National Labo… more
Date: July 8, 2011
Creator: Poirier, M. & Fink, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bulalo field, Philippines: Reservoir modeling for prediction of limits to sustainable generation

Description: The Bulalo geothermal field, located in Laguna province, Philippines, supplies 12% of the electricity on the island of Luzon. The first 110 MWe power plant was on line May 1979; current 330 MWe (gross) installed capacity was reached in 1984. Since then, the field has operated at an average plant factor of 76%. The National Power Corporation plans to add 40 MWe base load and 40 MWe standby in 1995. A numerical simulation model for the Bulalo field has been created that matches historic pressure … more
Date: January 28, 1993
Creator: Strobel, Calvin J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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EFFECTS OF TRITIUM EXPOSURE ON UHMW-PE, PTFE, AND VESPEL

Description: Samples of three polymers, Ultra-High Molecular Weight Polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE, also known as Teflon{reg_sign}), and Vespel{reg_sign} polyimide were exposed to 1 atmosphere of tritium gas at ambient temperature for varying times up to 2.3 years in closed containers. Sample mass and size measurements (to calculate density), spectra-colorimetry, dynamic mechanical analysis (DMA), and Fourier-transform infrared spectroscopy (FT-IR) were employed to characterize the ef… more
Date: May 31, 2006
Creator: Clark, E & Kirk Shanahan, K
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mass Transfer Model for a Breached Waste Package

Description: The degradation of waste packages, which are used for the disposal of spent nuclear fuel in the repository, can result in configurations that may increase the probability of criticality. A mass transfer model is developed for a breached waste package to account for the entrainment of insoluble particles. In combination with radionuclide decay, soluble advection, and colloidal transport, a complete mass balance of nuclides in the waste package becomes available. The entrainment equations are der… more
Date: July 26, 2004
Creator: Hsu, C. & McClure, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Liquid phase Fischer-Tropsch (II) demonstration in the Laporte Alternative Fuels Development Unit. Final topical report. Volume 7, Appendix. Task 1, Engineering modifications (Fischer-Tropsch II demonstration) and Task 2, AFDU shakedown, operations, deactivation and disposal (Fischer-Tropsch II demonstration)

Description: This report presents results from a demonstration of Liquid Phase Fischer-Tropsch (LPFT) technology in DOE`s Alternative Fuels Development Unit (AFDU) at LaPorte, Texas. The run was conducted in a bubble column at the AFDU in May--June 1994. The 10-day run demonstrated a very high level of reactor productivity for LPFT, more than five times the previously demonstrated productivity (1). The productivity was constrained by mass transfer limitations, perhaps due to slurry thickening as a result of… more
Date: September 1, 1995
Creator: Bhatt, B.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Computational Analysis of the SRS Phase III Salt Disposition Alternatives

Description: Completion of the Phase III evaluation and comparison of salt disposition alternatives was supported with enhanced computer models and analysis for each case on the ''short list'' of four options. SPEEDUP(TM) models and special purpose models describing mass and energy balances and flow rates were developed and used to predict performance and production characteristics for each of the options. Results from the computational analysis were a key part of the input used to select a primary and an a… more
Date: October 7, 1999
Creator: Dimenna, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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REINVESTIGATING THE PROCESS IMPACTS FROM OXALIC ACIDHIGH LEVEL WASTE TANK CLEANING

Description: The impacts and acceptability of using oxalic acid to clean the Savannah River Site, High Level Waste Tanks 1-8, were re-investigated using a two-phased approach. For the first phase, using a representative Tank 1-8 sludge, the chemical equilibrium based software, OLI ESP{copyright} and Savannah River Site laboratory test results were used to develop a chemically speciated material balance and a general oxalate mass balance. Using 8 wt% oxalic acid with a 100% molar excess, for every 1 kg of sl… more
Date: January 22, 2008
Creator: Ketusky, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Moving Beyond Pump and Treat Toward Enhanced Attenuation and Combined Remedies T-Area, Savannah River Site

Description: Groundwater beneath T-Area, a former laboratory and semiworks operation at the Department of Energy (DOE) Savannah River Site, is contaminated by chlorinated solvents (cVOCs). Since the contamination was detected in the 1980s, the cVOCs at T-Area have been treated by a combination of soil vapor extraction and groundwater pump and treat. The site has received approval to discontinue the active treatments and implement a full scale test of enhanced attenuation--an engineering and regulatory strat… more
Date: April 3, 2008
Creator: Looney, B.; Brian Riha, B.; Warren Hyde, W.; Jay Noonkester, J. & Gerald Blount, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Removal of Iodide From Groundwater Using Silver Chloride-White Paper

Description: Releases from the F and H Area Seepage Basins on the Savannah River Site (SRS) have caused groundwater plumes that contain a variety of contaminants. These plumes are releasing contaminants into Fourmile Branch, which is a small tributary of the Savannah River. The metallic contaminant releases to the branch are being controlled by base injection. The base injection targets cationic contaminants and was not intended to reduce the concentration of I-129 in groundwater. SRS and the regulatory age… more
Date: November 26, 2008
Creator: Denham, M.; Bach, M. & Millings, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Equilibrium ammonium concentration in slurry mix evaporator condensate tank (SMECT) with ammonia scrubbers

Description: During design reviews of the Recycle Colection Tank (RCT) at the Savannah River Site it was determined that in all cases the RCT scrub solution could not be routed to the RCT. During transfers to the tank farm (estimated ten hour cycle), the ammonia evolved from the RCT is scrubbed by the RCT scrubber and the ammonia scrub water must be returned to the SMECT. The result of this is an increased steady state concentration of ammonium in the SMECT water used for the ammonia scrubbers. The maximum … more
Date: September 25, 1992
Creator: Lambert, D. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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California GAMA Special Study: An isotopic and dissolved gas investigation of nitrate source and transport to a public supply well in California's Central Valley

Description: This study investigates nitrate contamination of a deep municipal drinking water production well in Ripon, CA to demonstrate the utility of natural groundwater tracers in constraining the sources and transport of nitrate to deep aquifers in the Central Valley. The goal of the study was to investigate the origin (source) of elevated nitrate and the potential for the deep aquifer to attenuate anthropogenic nitrate. The site is ideal for such an investigation. The production well is screened from … more
Date: April 14, 2010
Creator: Singleton, M. J.; Moran, J. E.; Esser, B. K.; Roberts, S. K. & Hillegonds, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DWPF FLOWSHEET STUDIES WITH SIMULANTS TO DETERMINE MCU SOLVENT BUILD-UP IN CONTINOUS RUNS

Description: The Actinide Removal Process (ARP) facility and the Modular Caustic Side Solvent Extraction Unit (MCU) are scheduled to begin processing salt waste in fiscal year 2007. A portion of the streams generated in these salt processing facilities will be transferred to the Defense Waste Processing Facility (DWPF) to be incorporated in the glass matrix. Before the streams are introduced, a combination of impact analyses and research and development studies must be performed to quantify the impacts on D… more
Date: May 25, 2006
Creator: Lambert, D; Frances Williams, F; S Crump, S; Russell Eibling, R; Thomas02 White, T & David Best, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of Mercury Emissions from Coal-Fired Facilities with SCR and FGD Systems

Description: CONSOL Energy Inc., Research & Development (CONSOL), with support from the U.S. Department of Energy, National Energy Technology Laboratory (DOE) and the Electric Power Research Institute (EPRI), is evaluating the effects of selective catalytic reduction (SCR) on mercury (Hg) capture in coal-fired plants equipped with an electrostatic precipitator (ESP)--wet flue gas desulfurization (FGD) combination or a spray dyer absorber--fabric filter (SDA-FF) combination. In this program CONSOL is determi… more
Date: January 31, 2006
Creator: Withum, J. A.; Tseng, S. C. & Locke, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Mercury Emissions from Coal-Fired Facilities with SCR and FGD Systems

Description: CONSOL Energy Inc., Research & Development (CONSOL), with support from the U.S. Department of Energy, National Energy Technology Laboratory (DOE) and the Electric Power Research Institute (EPRI), is evaluating the effects of selective catalytic reduction (SCR) on mercury (Hg) capture in coal-fired plants equipped with an electrostatic precipitator (ESP)--wet flue gas desulfurization (FGD) combination or a spray dyer absorber--fabric filter (SDA-FF) combination. In this program CONSOL is determi… more
Date: February 1, 2006
Creator: Withum, J. A. & Locke, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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