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Waste - OSTI GOV

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Last Updated: 27 September 2022

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Valuation of Novel Waste Heat Sources and a Path Towards Adoption: Preprint

Both the use of waste heat sources at a wide variety of temperatures are controlled at near-ambient temperatures and hence enable heating electrification, as well as the use of waste heat sources at a wide variety of temperatures. We discuss the ability of waste heat to supply the required heat to these networks in this paper, as well as the company models that might increase the use of these waste heat sources. Heat flow and temperature profiles from five different sources of waste heat sources are analyzed as part of this study. Waste heat can cover up to 66% of the heat provided to the ambient loop and reduce overall electricity consumption for heating by up to 51%, depending on the characteristics of the specific power, temperature, and type of waste heat source.

Source link: https://www.osti.gov/biblio/1885581


Effect of chlorine and chromium on sulfur solubility in low-activity waste glass

According to an empirical sulfur solubility model built from more than 200 simulated low-activity waste glasses, chlorine, and chromium, there are significant effects on lowering sulfur solubility in glass. This research was aimed at discovering the mechanism behind the negative effects of chlorine and chromium on sulfur solubility. sodium sulfate, sodium chloride, and sodium chromate salts were added to and saturated by sodium sulfate, sodium chloride, and sodium chromate salts as single components or as mixtures with different ratios at 25 mol%, 50 mol%, and 75 percent of sulfate mixed with chloride or chromate. It's likely that the negative effect of chlorine, and chromium on sulfur solubility can be explained based on the simple fact that anions are searching for the voids or interstitial sites of the glass matrix, and that their solubility is highly dependent on the effective size of corresponding anions.

Source link: https://www.osti.gov/biblio/1829503


Quantification of Raman-Interfering Polyoxoanions for Process Analysis: Comparison of Different Chemometric Models and a Demonstration on Real Hanford Waste

Over 100 million gallons of liquid radioactive waste of unknown origin will be chemically processed and vitrified, but the composition's complex chemical composition and highly radioactive nature of the waste precludes the use of more advanced, offline techniques to determine the composition. Since the tank waste is mainly made up of oxoanions, which tend to have interfering Raman spectra, it's unclear which chemometric approach is most appropriate to accurately quantify analytes in the presence of interfering signals. NO 3 u2013, CO 3 2 u2013, and CO 3 2u2013 were measured using their bands around 1050 cm u20131 u20131. PLS-based model was found to be the most effective solution from both a model design and application perspective for all samples.

Source link: https://www.osti.gov/biblio/1829446


Analysis of Defense Waste Processing Facility Sample: Recycle Collection Tank Sample Batch 4945

This RCT paper is the first of three sample characterization reports that will be used for this DWPF Project. The other DWPF reports will include the analysis of the Off-Gas Condensate Tank OGCT and the Slurry Mix Evaporator Condensate Tank SMECT samples.

Source link: https://www.osti.gov/biblio/1813941


Defense Waste Processing Facility Nitric-Glycolic Flowsheet Chemical Process Cell Chemistry: Part 2

The amount of glycolate in the final melter feed varies according to the amount of the glycolic acid feed that is destroyed. It was also found that the measured REDOX versus the predicted REDOX was much higher when the material balance adjusted glycolate values were used. Although glycolate degradation for two data series e. g. , [SB9-NG] and [SR+BH] was found to be dependent on HSV, the sum of both three data sets was not found to have significant dependence on this variable. When noble metals and Hg were not present, conversion of glycolate to formate was high, with figures up to 100 percent. This second model predicts that more oxalate will be produced when Ru-nitrosyl nitrate is used rather than Ru chloride. The conversion from nitrite to nitrate depended on AS and PRA, with HSV and Hg being particularly significant when these variables were different. When starting with only the sludge's AS and PRA, the 95% confidence intervals on estimated glycolate conversion, glycolate to oxalate conversion, and nitrite to nitrate conversion were used to determine the uncertainty in the predicted REDOX. The uncertainty in the predicted REDOX was estimated using the 95% confidence in getting a particular value for a single test rather than what the mean would be for multiple tests.

Source link: https://www.osti.gov/biblio/1813938


Low-Activity Waste Glass Standards Preparation and Characterization for Calibration of Analytical Instruments

When testing LAW glass compositions, a matrix of seven low-activity waste glasses was designed and characterized as laboratory calibration and matrix interference standards for measuring LAW glass compositions by the Hanford Waste Treatment and Immobilization Plant. The matrix of glasses was intended to show the variety of LAW glass compositions that could be created by the WTP. Samples from each of the seven glasses were tested with electron probe microanalysis, ion chromatography, and bulk inductively coupled plasma mass spectroscopy to measure variation and accuracy within batches and within individually poured glass bar samples. For parts with low concentrations due to instrument detection limits, the difference and standard deviations were calculated. At low component concentrations, IC and ICP-MS percent changes and standard deviations were higher. For each of the seven glasses, EPMA results were statistically analyzed to determine homogeneity within single bars and whole compositions.

Source link: https://www.osti.gov/biblio/1810475


Hanford Double Shell Waste Tank Corrosion Studies FY2020 (Final Report)

The Savannah River National Laboratory concentrated on three experimental tasks relating to Hanford Double Shell Tank chemistry and integrity for fiscal year 2020. At manufacturer recommended dosages, the second task investigated vapor space corrosion of the secondary liner's vapor space corrosion. Finally, the third task investigated the long-term open circuit drift for mill-scale coupons, polished surfaced coupons, and partial mill-scale coupons that were exposed to tank waste simulants. The OCP drift was determined by the quantity and composition of organic compounds added to the simulant, according to additional experiments to quantify the OCP drift as a result of the number and composition of organic compounds added to the simulant.

Source link: https://www.osti.gov/biblio/1810479

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions