Download or read book Strontium Removal from Caustic Carbonate Waste Solutions Using Carrier Coprecipitation written by and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A carrier coprecipitation procedure has been developed for the radioactive strontium from caustic liquid low-level waste (LLLW) generated at Oak Ridge National Laboratory. The from caustic liquid low-level waste (LLLW) generated at Oak two-step treatment process involves the addition of normal Sr (as SrCl2) to the waste matrix, which is composed primarily of 0.3 M NAOH and 0.6 M Na2CO3. The active Sr equilibrates with the normal Sr carrier and coprecipitates as SrCO3 at pH 13. A liquid/solid separation is made before the pH of the supernate is reduced to pH 8 with sulfuric acid. During the neutralization step, the aluminum in the waste precipitates as Al(OH)3 Further Sr decontamination is achieved as traces of active Sr sorb to the Al(OH)3 that precipitates during the neutralization step. A final liquid/solid separation is made at pH 8 to remove the sorbed active Sr.
Download or read book WM 94 written by and published by . This book was released on 1994 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radioactive Waste Management written by and published by . This book was released on 1995 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Removal of Strontium and Cesium from Nuclear Waste Solutions by Foam Separation written by E. Schonfeld and published by . This book was released on 1960 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strontium in Drinking Water written by Alissa J. O'Donnell and published by . This book was released on 2014 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: The occurrence and distribution of stable strontium around the United States was not well documented. Data from both the United States Geological Survey and United States Environmental Protection Agency from the past 10 years resulted in 39,256 samples that showed strontium was widely distributed with pockets of very elevated levels (= 10 mg/L) located along the Gulf Coast for surface water and in the Midwest for groundwater. Strontium removal data from a number of full-scale ion exchange, iron removal/coagulation, lime softening, and iron-based adsorption plants were examined. Point-of-entry ion exchange and iron removal, and point-of-use reverse osmosis effectiveness were also studied. Cation exchange and lime softening were effective strontium removal strategies, while iron removal/coagulation and iron-based adsorption approaches were not. The effectiveness of conventional coagulation and lime softening treatments on the removal of strontium at the bench-scale was needed. Alum and iron coagulants were able to achieve 18% and 6.0% strontium removal, respectively, from surface water after 0.2 æm vacuum filtering. No significant change in strontium removal was observed with the increase of coagulant dose, initial strontium concentration, pH, or initial turbidity. Lime softening was able to achieve 77% strontium removal after 0.2 æm vacuum filtering. Higher strontium removal efficiencies were seen at higher lime dosages which corresponded to a higher final pH. No significant changes in strontium removal was observed with the increase of initial strontium concentration. Fundamental studies were conducted with nanopure water to find the mechanism(s) for the lime softening strontium removal efficiencies. When calcium was not initially added, no significant change in strontium removal was observed with the increase of pH or initial strontium concentration. When calcium was initially added, the strontium and calcium removals were significantly increased above pH 11 to 65% and 98%, respectively. When calcium was initially added, a low initial dissolved inorganic carbon greatly reduced both strontium and calcium removal efficiencies to 8.1% and 29%, respectively. Scanning electron microscope (SEM) images for the fundamental experiments at a pH of 11 showed high spherical vaterite, the least stable polymorph of calcium carbonate, is prevalent in the samples compared to rhombohedron calcite, the most stable polymorph. Strontianite was only found in the sample with the lowest initial calcium concentration. X-ray diffraction patterns revealed that vaterite was shifted, indicating that strontium could be replacing calcium inside the crystal lattice. SEM images also revealed clusters of minerals in a transitional phase at the lowest and highest initial calcium concentrations. The possible mechanism(s) for strontium removal during the lime-soda ash softening treatment process includes surface adsorption into calcium carbonate precipitates, coprecipitation with the calcium carbonate precipitations, or surface-solution ion exchange within calcium carbonate.
Download or read book Cooperative Nutritional Status Studies in the Northeastre written by and published by . This book was released on 1954 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Removal of Strontium and Cesium from Nuclear Waste Solutions by Foam Separation written by E. Schonfeld and published by . This book was released on 1960 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Development of a Carrier Precipitation Process for the Recovery of Strontium from Purex Wastes written by and published by . This book was released on 1961 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Strontium recovery from Purex 1WW was investigated with simulated feeds and tracer activities. Initial experiments demonstrated recovery of over 70% of the strontium by sulfate precipitation from partially neutralized 1WW by either increasing the sulfate concentration to about 3 M or by adding carriers such as lead. Precipitation of iron was avoided by addition of one or more moles of tartrate per two moles of iron. Precipitation at elevated temperatures and addition of lead after pH adjustment were shown to be beneficial. Strontium recoveries of over 95% were achieved by precipitation at about 80 deg C at pH values of 0.4 to 4.0 with sulfate concentrations of 0.67 to 3 M and over 0.02 M lead carrier added. High sulfate concentrations were required at low pH, but the sulfate concentration is not critical above pH 1. Some separation of strontium from cerium was observed at pH 2 to 4, with the degree of separation being dependent on both tartrate concentration and pH. Recovery of strontium from the sulfate precipitate by leaching with nitric acid, sodium acetate, or oxalic acid was unsatisfactory because of the large volumes required. Metathesis with sodium hydroxide removed most of the lead as plumbite and converted the precipitate to an acid-soluble form, but resulted in excessive strontium losses. Metathesis with carbonate-- hydroxide mixtures retained the benefits of hydroxide metathesis, and resulted in only very low strontium losses. Selective leaching of rare earths from the suIfate or carbonate precipitates using various complexing agents was generally unsuccessful. Recovery of strontium from the carbonate precipitate by washing with mixtures of nitric and oxalic acids, or by dissolution in nitric acid followed by oxalate precipitation was demonstrated. The techniques developed were successfully applied in the Purex plant in meeting Hanford's megacurie commitment of Sr9° for the SNAP program prototypes. (auth).
Download or read book Crossflow Filtration and Rheology of a Strontium Carbonate written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Department of Energy is sponsoring the River Protection Project (RPP) at the Hanford site in order to pretreat and vitrify nuclear waste. Processing of Hanford complexant-bearing aqueous waste requires pretreatment to remove specific radionuclides. This removal is accomplished by a strontium nitrate/sodium permanganate precipitation and filtration process. Rheology, particle size, and filtration measurements that were made with actual Hanford waste are presented in this paper.
Download or read book Evaluation of Alternate Materials and Methods for Strontium and Alpha Removal from Savannah River Site High Level Waste Solutions written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A literature survey indicated a number of alternate materials and methods for the removal of strontium and alpha-emitting radionuclides (actinides). We evaluated the use of alternate materials versus proposed flowsheets for salt processing at the Savannah River Site (SRS). From this evaluation we recommend the following materials for further testing to determine the rate and extent of removal. We do not recommend testing of liquid/liquid extraction and polymer filtration methods at this time.
Download or read book Recovery of Strontium from Stored Purex Waste by Lead Sulfate Carrier Precipitation written by G. L. Richardson and published by . This book was released on 1964 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AMRL TR written by and published by . This book was released on 1962 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanisms of Strontium and Uranium Removal From Radioactive Waste Simulant Solutions by the Sorbent Monosodium Titanate written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-Level Radioactive Waste (HLW) is the priority problem for the U.S. Dept. of Energy's Environmental Management Program. Current HLW treatment processes at the Savannah River Site (Aiken, SC) include the use of monosodium titanate (MST, similar to NaTi2O5xH2O) to concentrate radioactive strontium (Sr) and actinides. Mechanistic information about radionuclide uptake will provide us with insight about the reliability of MST treatments. We characterized the morphology of MST and the chemistry of sorbed Sr{sup 2+} and uranium [U(VI)] on MST with x-ray based spectroscopic and electron microscopic techniques. Sorbed Sr{sup 2+} exhibited specific adsorption as partially-hydrated species, whereas sorbed U exhibited site-specific adsorption as monomeric and dimeric U(VI)-carbonate complexes. These differences in site specificity and mechanism may account for the difficulties associated with predicting MST loading and removal kinetics.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Engineering written by American Institute of Chemical Engineers and published by . This book was released on 1964 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
