14 experiments to evaluate colloid facilitated transport of cesium over long time and distance scales telfeyan lanl
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Experiments were conducted to evaluate the colloid-facilitated transport of cesium over long time scales using mini columns packed with Grimsel granodiorite. Cesium was sorbed to colloids extracted from Chancellor Cave water or bentonite colloids. The columns measured the partitioning of cesium between the dissolved and colloidal phases, as well as cesium desorption rates from colloids. Additional batch desorption experiments investigated cesium release from colloids in synthetic groundwater with and without additional cesium concentrations. The experiments aim to better understand cesium mobility in the subsurface over long distances and timeframes relevant to nuclear waste repositories.
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Effect of Operating Conditions on CSTR performance: an Experimental Study
Coarse CFD-DEM simulation of Rare Earth Element leaching reactor, FCC re-gen...
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Abstracts of publications in ppc whilst affiliated with sask power
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Similar to 14 experiments to evaluate colloid facilitated transport of cesium over long time and distance scales telfeyan lanl
Membrane separation processes
The document describes a study on using a hollow fiber supported liquid membrane for separating and concentrating gold(I) from aqueous cyanide media. The study used a liquid membrane of n-heptane immobilized on polypropylene hollow fibers, with LIX79 as the extractant. Experimental results showed the system was stable over long operation times. The membrane was able to efficiently separate gold(I) from other metal cyanides like silver, copper, nickel and iron, with high selectivity for gold(I). Sodium hydroxide was used as the stripping solution to effectively remove gold(I) into the receiving solution.
QCCSRC research overview May 2013
This document summarizes the Qatar Carbonates and Carbon Storage Research Centre (QCCSRC). The QCCSRC conducts multidisciplinary carbon storage research projects funded by industry through a $70 million, 10-year program involving over 70 researchers. The research includes reservoir condition experiments to study fluid-fluid and fluid-rock interactions. It also includes the first 3D micro CT images of residual supercritical CO2 in carbonate rock. The goal is to build predictive models for carbon sequestration through improved understanding of processes in carbonate reservoirs and seals.
D362130
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Chromatography- Principles and application of chromatography
Laboratory technique for the Separation of mixtures
Chroma -"color" and graphein - "to write”.
Colour bands - separation of individual compounds
Measured or analysed.
Analytical
Determine Chemical composition of a sample
Preparative
Used to purify sufficient quantities of a substance
Chromatograph - equipment that enables a sophisticated
separation
EX. Gas chromatography or Liquid chromatography
Eluent - Fluid entering column/ solvent that carries the analyte.
Eluate - Mobile phase leaving the column.
Stationary phase - Immobilized phase
Immobilized on the support particles or on the inner wall of the column tubing.
Examples : Silica layer - Thin Layer Chromatography
Quantification of Saline Aquifers for Geological Storage of CO2 – Experiences...
Quantification of Saline Aquifers for Geological Storage of CO2 – Experiences...UK Carbon Capture and Storage Research Centre
Presentation given by Auli Niemi of Uppsala University on "Quantification of Saline Aquifers for Geological Storage of CO2 – Experiences from MUSTANG Project" at the EC FP7 Projects: Leading the way in CCS implementation event, London, 14-15 April 2014Understanding Dynamic chemistry at the Catalytic Interface
Understanding Dynamic chemistry at the Catalytic InterfaceHelmholtz-Zentrum Berlin für Materialien und Energie
The presentation talks about the In Situ techniques to probe the dynamic behaviour happening at the Catalytic Interfaces.Leachability of Elements From Hydraulic Fracturing Residuals by Dr. Gregory B...
Leachability of Elements From Hydraulic Fracturing Residuals by Dr. Gregory B...Appalachian Research Initiative for Environmental Science
This document summarizes a study on the leachability of elements from hydraulic fracturing residuals. The study involved collecting representative samples of residuals, identifying elements of concern, conducting leaching tests using different solutions, and analyzing the results. Key findings include that alkali metals, alkaline earth metals, and halides leached at high concentrations. Transition metals and metalloids generally leached at low or trace levels. More elements leached in more aggressive solutions. Disposal practices may require treatment of residuals before landfilling to prevent groundwater contamination.Modern chromatographic technique.pptx
This document provides an overview of modern chromatographic techniques, including gas chromatography (GC), high performance liquid chromatography (HPLC), thin layer chromatography (TLC), and combinations of chromatography with mass spectrometry (GC-MS and LC-MS). It discusses the basic principles, instrumentation, and applications of these techniques. Key points include that chromatography separates mixtures based on differences in partitioning between a stationary and mobile phase, while mass spectrometry provides structural information about separated components through mass analysis. Modern instruments have advanced features like temperature programming, various detectors, and computerized data analysis.
31 session corrosion of spent nuclear fuel canisters bryan sand2017 5541 pe
The document summarizes work related to corrosion of spent nuclear fuel canisters. It discusses experiments conducted at Sandia National Laboratories to study stress corrosion cracking of the canisters, including studies of brine stability, pitting damage quantification and the pit-to-crack transition process. It also outlines planned work for fiscal year 2018, including continued coupon tests under simulated storage conditions and microelectrochemical mapping of stressed samples to study the effects of stress on corrosion susceptibility.
NASA Report
This document provides a final report on an internship with NASA's RESOLVE project. The report summarizes testing done on various components of the RESOLVE Engineering Test Unit (ETU) fluid subsystem. Pressure transducers were tested for repeatability under varying pressure and temperature conditions. Resistance temperature detectors were tested using a procedure that exposed them to a range of temperatures in atmospheric and vacuum environments. Additional tests analyzed heat wrapping configurations, compared options for gold deposition, and evaluated a mini-manifold design. The results of these tests will help optimize components for integrated testing of the ETU fluid subsystem and other RESOLVE subsystems in a vacuum chamber. The internship provided hands-on experience with testing spaceflight hardware and procedures
Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Pl...
Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Pl...UK Carbon Capture and Storage Research Centre
Presentation given by Enzo Mangano of the University of Edinburgh on "Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Plants – AMPGas" at the UKCCSRC Gas CCS Meeting, University of Sussex, 25 June 2014Basic concept of chromatography
Chromatography is a technique used to separate mixtures by distributing components between a stationary and mobile phase. It works on the principle that different compounds interact differently with the phases and therefore move through the system at different rates. There are various types of chromatography classified by mobile phase (gas or liquid) or interaction forces (adsorption, partition, ion exchange). Key components are the mobile phase, stationary phase, and supporting medium. Chromatography is widely used in fields like analytical chemistry, biochemistry, environmental analysis and forensic science.
Gravimetric analysis, P K MANI
The document discusses the history and techniques of gravimetric analysis. It provides background on influential chemists like Berzelius and Richards who developed many gravimetric analysis methods in the 19th century. The document then explains key concepts in gravimetric analysis like accuracy vs precision. It outlines the common steps involved in gravimetric analysis including precipitation, filtration, drying and weighing. Finally, it discusses important factors that influence precipitation like particle size, digestion, and conditions for analytical precipitation.
Gas Chromatography
Gas Chromatography is an analytical techniques, used for the separation of volatile substances on the basis of their partition coefficient . In this slide you will find out different instrumentation of gas chromatography, its advantages, disadvantages and moreover its applications.
Chato refueling with in situ produced propellants 2014
In-situ produced propellants have been identified in many architecture studies as key to implementing feasible chemical propulsion missions to destinations beyond lunar orbit. Some of the more noteworthy ones include: launching from Mars to return to Earth (either direct from the surface, or via an orbital rendezvous); using the Earth-Moon Lagrange point as a place to refuel Mars transfer stages with Lunar surface produced propellants; and using Mars’ Moon Phobos as a place to produce propellants for descent and ascent stages bound for the Mars surface. However successful implementation of these strategies require an ability to successfully transfer propellants from the in-situ production equipment into the propellant tankage of the rocket stage used to move to the desired location. In many circumstances the most desirable location for this transfer to occur is in the low-gravity environment of space. In support of low earth orbit propellant depot concepts, extensive studies have been conducted on transferring propellants in-space. Most of these propellant transfer techniques will be applicable to low gravity operations in other locations. Even “ground-based” transfer operations on the Moon, Mars, and especially Phobos could benefit from the propellant conserving techniques used for depot refueling. This paper will review the literature of in-situ propellants and refueling to: assess the performance benefits of the use in-situ propellants for mission concepts; review the parallels with propellant depot efforts; assess the progress of the techniques required; and provide recommendations for future research.
STM & XPS studies of HCl on Cu(100)/O(a)
Presentation given to the UK Catalysis conference, January 8th 2016 based on the paper:
Article title: XPS and STM studies of the oxidation of hydrogen chloride at Cu(100) surfaces
Article reference: SUSC20763
Journal title: Surface Science
Corresponding author: Prof. Philip R. Davies
Online publication complete: 7-JAN-2016
DOI information: 10.1016/j.susc.2015.12.024
Immobilisation in the permeable zone: Residual trapping, capillary heterogene...
Immobilisation in the permeable zone: Residual trapping, capillary heterogene...UK Carbon Capture and Storage Research Centre
Immobilisation in the permeable zone: Residual trapping, capillary heterogeneity - presentation by Sam Krevor of Imperial College London at the UKCCSRC meeting Monitoring of the deep subsurface: leakage pathways – understanding and monitoring the mechanics of CO2 storage, 23 October 2014Rajeshri patil
Gas chromatography is an analytical technique used to separate and analyze chemical compounds. It involves vaporizing a sample and injecting it into a column with a gaseous mobile phase. Components are separated based on how they partition between the mobile and stationary phases. The separated components exit the column and are detected, producing a chromatogram. Key advantages are its speed, sensitivity, and ability to analyze volatile organic and inorganic compounds. Common detectors include the flame ionization detector and thermal conductivity detector. Gas chromatography has many applications in fields like drug analysis, food testing, and environmental analysis.
L8-Gas chromatography.ppt
Gas chromatography (GC) is a technique used to separate compounds based on their interactions with a mobile gas phase and stationary phase. GC can separate volatile and non-volatile compounds. It works by carrying compounds through a column with an inert gas and detecting when compounds exit based on their interaction with the stationary phase. Common detectors include the flame ionization detector, thermal conductivity detector, electron capture detector, and nitrogen-phosphorus detector.
Konnaris - CEG8110
This document summarizes a study assessing the performance of two down-flow hanging sponge (DHS) reactors in treating domestic wastewater. The objectives were to achieve reactor acclimation, test purification efficiency against EU standards, and assess phosphorus removal effectiveness. Results showed that Reactor 2 design was more effective at removing contaminants like COD, nitrogen, phosphates and solids. Modifications adding granular activated carbon helped achieve phosphorus reductions, but the material had a short lifetime. Overall, the DHS reactors showed potential for secondary treatment, but further research is needed to improve phosphorus removal through enhanced biological uptake.
Similar to 14 experiments to evaluate colloid facilitated transport of cesium over long time and distance scales telfeyan lanl (20)
Chromatography- Principles and application of chromatography
Chromatography- Principles and application of chromatography
Quantification of Saline Aquifers for Geological Storage of CO2 – Experiences...
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31 session corrosion of spent nuclear fuel canisters bryan sand2017 5541 pe
31 session corrosion of spent nuclear fuel canisters bryan sand2017 5541 pe
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Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Pl...
Chato refueling with in situ produced propellants 2014
Chato refueling with in situ produced propellants 2014
Immobilisation in the permeable zone: Residual trapping, capillary heterogene...
Immobilisation in the permeable zone: Residual trapping, capillary heterogene...
More from leann_mays
43 international collaboration skb ebs task force overview jove-colon sand2...
This document summarizes work being done by the SKB Task Force related to modeling the engineered barrier system for a spent nuclear fuel repository. It discusses several tasks focused on thermomechanical modeling of bentonite clay buffer and backfill material using data from experiments at the Äspö Hard Rock Laboratory. The tasks aim to improve understanding and modeling of bentonite clay homogenization, water transport, gas transport, and the bentonite-rock interface using benchmarks from experiments. The ultimate goal is to better predict the long-term behavior of buffer/backfill materials under normal and abnormal conditions.
27 task f fluid inclusion and movement in tight rocks wang sand2017-4132 pe...
Sandia National Laboratories researched fluid inclusion and movement in tight rocks. They used modeling and experiments to understand how fluid inclusions migrate under thermal gradients and how their shape and movement are affected by factors like inclusion size, thermal gradient, solubility, and permeability of the surrounding rock. Their goal is to better understand how fluids can move even in very tight rocks and how this movement may impact issues like waste isolation.
13 ensa enun 32 p rail cask transport tests start june 2017 mcconnell sand201...
Sandia National Laboratories and Pacific Northwest National Laboratory are conducting tests of a Spanish-designed spent nuclear fuel transport cask to collect data on stresses to the spent fuel during normal transport conditions. Tests will include transport by heavy-haul truck, ship, and rail in both the U.S. and Europe between June and August 2017. Instrumented mock fuel assemblies will collect strain and acceleration data during all transport stages and mode transfers. The data will help validate that spent fuel integrity is maintained during normal transport vibrations and impacts.
03 dry cask simulator experiments for cfd validation durbin sand2017 4330 c
Sandia National Laboratories conducted experiments using a Dry Cask Simulator (DCS) to validate computational fluid dynamics (CFD) models for spent nuclear fuel storage cask thermal analyses. The DCS uses a scaled prototype boiling water reactor assembly inside a pressure vessel to simulate internal conditions of dry casks. Thermocouples measure temperature profiles under various decay heat and helium pressure conditions to model aboveground and belowground cask storage. Initial testing of the aboveground configuration showed good agreement between experimental temperature measurements and CFD simulations, within estimated uncertainties.
17 laboratory testing approach for intermediate scale borehole heater test mi...
Sandia National Laboratories is preparing to conduct laboratory testing and analysis related to an intermediate scale borehole heater test. The testing will involve analyzing rock core samples, gases, and brines before, during, and after the test to observe the effects of heating. Specific analyses will include measuring core properties like porosity and pore size, as well as analyzing gas and brine compositions through techniques like gas chromatography, ion chromatography, and ICP-MS. Preliminary brine analysis of three samples found them to have a Na-Mg-Cl composition typical of WIPP brines. The laboratory work aims to provide detailed data on material interactions and micro-mechanical processes during heating to inform long-term repository performance.
10 sfwst – disposal in argillite r&d barrier material degradation and int...
The document summarizes research being conducted by Sandia National Laboratories and Los Alamos National Laboratories on disposal of nuclear waste in deep geologic repositories. It discusses several modeling and experimental efforts, including reactive transport modeling to study the effects of decay heat on engineered barrier systems, clay interaction experiments to understand clay-metal interactions during corrosion of waste packages, and international collaborations on projects like FEBEX-DP to characterize the bentonite-concrete interface using X-ray computed tomography. It also summarizes preliminary thermodynamic modeling of steel corrosion and reactive transport modeling of the Closure Test Drift to simulate cement-water interactions.
07 international collaboration activities in disposal r and d relevance to r ...
1) The document discusses DOE's participation in various international R&D collaborations related to nuclear waste disposal, including projects in Switzerland, Sweden, Germany, China, and other countries.
2) These collaborations support the GDSA program by furthering scientific understanding of key disposal processes, improving process models, and providing data to validate GDSA models.
3) Specific collaborations discussed include the Mont Terri project, DECOVALEX, SKB task forces, and a planned HotBENT project, with details provided on how they contribute to modeling and understanding disposal system behavior.
59 an example of a regional geologic evaluation of argillite for disposal of ...
The document summarizes a regional geologic evaluation of the Pierre Shale formation for its potential to host a repository for high-level radioactive waste and spent nuclear fuel. The Pierre Shale has desirable properties like its depth, large extent, high clay content, and stable tectonic setting. The evaluation assesses available data on the formation's stratigraphy, hydrogeology, seismic activity, and other features to evaluate its suitability for long-term repository performance. The Pierre Shale is representative of clay-rich Cretaceous formations that warrant further review for a deep geologic repository.
51 update on the fifth worldwide review international approaches for nuclear ...
The document summarizes a recently released report on international approaches for nuclear waste disposal in geological formations. It describes the content of the report, which reviews the status of scientific and technical advances as of 2016 in nuclear waste disposal programs in 23 countries. It also provides information on how to access the full report online or from the websites listed. Finally, it briefly describes a workshop held in 2016 to discuss the report, noting that it involved participants from 12 countries who presented on waste disposal programs in 21 countries.
49 collaboration with swedish deep drilling project dobson lbnl
This document discusses collaboration between Lawrence Berkeley National Laboratory and Uppsala University on the Swedish Deep Drilling Project (COSC). The COSC project aims to drill two deep boreholes (COSC-1 and COSC-2) to study geological structures and characterize basement rocks and hydrology. COSC-1 will drill through the Seve Nappe to study channel flow, reaching a depth of 2.5 km with 100% core recovery. Funded activities for COSC-1 include logging the borehole to detect flowing fractures, modeling fluid flow, analyzing microbial communities in fractures, characterizing water compositions, and studying fractured core samples.
46 collaboration with clausthal germany on coupled thm modeling rutqvist lbnl
This document summarizes a collaboration between Lawrence Berkeley National Laboratory and Clausthal University on coupled thermo-hydro-mechanical (THM) modeling of salt. It discusses the TOUGH-FLAC and FLAC-TOUGH simulators, benchmarking results, improvements made to both codes, and an example collaboration project modeling heater tests at the Asse mine. The collaboration has improved salt THM modeling through code comparisons and jointly developing new constitutive models.
34 ciscc susceptibility and cgr testing sindelar srnl sti-2017-00323
1) Testing was conducted on teardrop-shaped samples of 304L stainless steel exposed to salt/dust mixtures to evaluate chloride-induced stress corrosion cracking (CISCC) susceptibility and crack growth rates (CGRs).
2) Visual indications of pitting and preliminary CGRs around 0.5 mm/year were observed. Additional testing is needed to better characterize cracking and the influence of sensitization.
3) Residual stresses from welding were identified as a potential driving force for CISCC in spent nuclear fuel canisters. Remote visual examination techniques may have limitations for cracking detection.
4) There is currently no consensus on an ASME code case for canister in-service inspection due to open questions around
33 residual stress simulation and experimental stress replication of mock up ...
This document discusses simulations and experiments related to residual stress and stress corrosion cracking in welded mock-ups. It summarizes residual stress simulations of circumferential and longitudinal welds using finite element analysis and compares results to experimental measurements. It also describes the design of four-point bend experiments using finite element simulations to replicate stress conditions and digital image correlation experiments to validate simulations. The purpose is to model stress corrosion cracking using multiphysics finite element analysis.
32 field test at maine yankee independent spent fuel storage instillation gor...
The document summarizes a field test being conducted at the Maine Yankee Independent Spent Fuel Storage Installation to study chloride deposition and stress corrosion cracking of stainless steel canisters containing spent nuclear fuel. Small specimens will be placed in the air circulation vents of four dry storage canisters and monitored over time to evaluate environmental conditions and potential canister degradation. Analysis indicates the small amount of vent blockage caused by the specimens will not significantly impact temperatures or be considered an off-normal condition. The results are intended to help understand long-term aging of the canister material.
30 fe heater test at mont terri rutqvist lbnl
The document summarizes the Full-scale Emplacement (FE) Experiment being conducted at Mont Terri, Switzerland. The experiment involves heating three heaters embedded in a buffer of bentonite clay and surrounded by instrumented Opalinus clay host rock. The goals are to test the performance of a geological disposal system and monitor thermal, hydrological, mechanical, and chemical processes. International modeling teams are benchmarking models against experimental data. Initial modeling matches observed temperature and moisture profiles well using a reduced vapor diffusion coefficient. Continued monitoring and interpretive modeling will focus more on mechanical stresses developing from swelling and thermal effects over the multi-year experiment.
29 international collaboration in disposal research fs experiment at mont ter...
The document summarizes an experiment conducted at the Mont Terri rock laboratory in Switzerland to study the potential for leakage along faults intersecting an underground radioactive waste repository. The experiment involved injecting water into a borehole intersecting a fault to incrementally increase pressure and monitor permeability changes, seismic activity, and deformation. Seismic events up to magnitude -2.5 were observed during one injection stage when pressure exceeded the strength of the fault-damage zone interface. Analysis showed 75% of fault movement was aseismic and a large pressure drop preceded seismic slip events. Future work includes studying how distant earthquakes may impact fault permeability and long-term injection tests.
28 international collaboration in disposal research mont terri project birkho...
The Mont Terri Project is an international research project studying clay and shale formations for radioactive waste disposal. It provides access to an underground rock laboratory and experimental data from experiments addressing various factors important for disposal. Current and upcoming experiments include studies of thermomechanical-hydrological effects, bentonite and clay barrier performance, gas leakage, diffusion of radionuclides, and cement-clay interactions. The project recently celebrated its 20th anniversary and plans to expand the underground rock laboratory for new experiments.
27b potential hot bent collaboration zheng v0 lbnl
The document discusses a potential collaboration called HotBENT to conduct a joint experiment at the Grimsel Test Site to evaluate the behavior of clay buffers at temperatures of 150-200°C. The experiment would provide data on clay properties at high temperatures that are limited in current models. Partners like NAGRA are interested to justify higher design temperatures that reduce costs and to ensure most of the clay buffer remains intact. A proposed experiment involves placing bentonite in the old FEBEX tunnel at Grimsel up to 200°C to study moisture transport and swelling properties over 5 years.
27a febex dp collaboration overview and related sfwst r and d activities zhen...
The document summarizes research from the FEBEX-DP collaboration studying the full-scale FEBEX bentonite experiment located in Grimsel, Switzerland. It discusses characterization of the bentonite following dismantling of heater #2, including changes to density, water content, mineralogy, and pore water chemistry. THM and THMC models were developed and validated against experimental data to analyze thermal-hydrological-mechanical and chemical processes. Microstructural analysis using synchrotron X-ray microCT provided 3D characterization of the bentonite microstructure. Further work is focused on refining chemical models, analyzing gas evolution and microbial activity, and characterizing the bentonite-concrete interface.
25 decovalex 2019 geochemical and reactive transport evaluations with relevan...
The document summarizes work evaluating geochemical trends in groundwater data from the GREET field experiment in Japan. It describes analyzing groundwater chemistry data from monitoring borehole MSB-2 to explore fluid mixing using geochemical modeling. EQ3/6 simulations of dilution and mixing of waters from Zones 1 and 7 of MSB-2 reproduced observed calcium and sulfate trends. The document also details planned 1D reactive transport modeling using PFLOTRAN of the Closure Test Drift to simulate the effects of cement interactions on porewater chemistry.
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43 international collaboration skb ebs task force overview jove-colon sand2...
43 international collaboration skb ebs task force overview jove-colon sand2...
27 task f fluid inclusion and movement in tight rocks wang sand2017-4132 pe...
27 task f fluid inclusion and movement in tight rocks wang sand2017-4132 pe...
13 ensa enun 32 p rail cask transport tests start june 2017 mcconnell sand201...
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03 dry cask simulator experiments for cfd validation durbin sand2017 4330 c
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10 sfwst – disposal in argillite r&d barrier material degradation and int...
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59 an example of a regional geologic evaluation of argillite for disposal of ...
51 update on the fifth worldwide review international approaches for nuclear ...
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49 collaboration with swedish deep drilling project dobson lbnl
49 collaboration with swedish deep drilling project dobson lbnl
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46 collaboration with clausthal germany on coupled thm modeling rutqvist lbnl
34 ciscc susceptibility and cgr testing sindelar srnl sti-2017-00323
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33 residual stress simulation and experimental stress replication of mock up ...
33 residual stress simulation and experimental stress replication of mock up ...
32 field test at maine yankee independent spent fuel storage instillation gor...
32 field test at maine yankee independent spent fuel storage instillation gor...
29 international collaboration in disposal research fs experiment at mont ter...
29 international collaboration in disposal research fs experiment at mont ter...
28 international collaboration in disposal research mont terri project birkho...
28 international collaboration in disposal research mont terri project birkho...
27b potential hot bent collaboration zheng v0 lbnl
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27a febex dp collaboration overview and related sfwst r and d activities zhen...
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- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
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See how organizational priorities and strategic approaches to data security and privacy are evolving around the globe.
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14 experiments to evaluate colloid facilitated transport of cesium over long time and distance scales telfeyan lanl
- 1. Spent Fuel and Waste Science and Technology Experiments to Evaluate Colloid- Facilitated Transport of Cesium Over Long Time and Distance Scales Katherine Telfeyan, Paul W. Reimus, S. Doug Ware Los Alamos National Laboratory Earth System Observations EES-14 Radiogeochemistry Group Argillite/Crystalline Session SFWST Working Group Meeting May 23, 2017
- 2. Spent Fuel and Waste Science and Technology 2 Introduction Strongly-sorbing radionuclides are only likely to be transported from nuclear repositories via colloid-facilitated transport Previous work on 137Cs sorption to colloids – Sorption has a nonlinear dependence on 137Cs concentration – Part of the 137Cs sorbed to colloids is desorbed very slowly or is partially irreversible GTSFieldExperiments LabExperiments Missana et al. (2004) Argillite/Crystalline Session of SFWST Working Group Meeting6/23/2016
- 3. Spent Fuel and Waste Science and Technology Introduction Discrepancy between 137Cs transport in the Grimsel Field System and in laboratory experiments – Higher Cs concentrations in laboratory (10-7 M, weak site dominance) compared to field study (10-10 M, strong site dominance) High and low affinity sites – 2-site sorption model for previous column experiments 3 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0 100 200 300 400 500 600 C/Co Volume, ml H-3 H-3Model Colloids ColloidModel Cesium CesiumModel 0 0.2 0.4 0.6 0.8 1 0 50 100 150 200 C/Co Cumulative Volume (mL) Cs w/o colloids Total Cs w/colloids Dissolved Cs w/colloids Cs w/o Col Model Cs w/ Col Model H-3 GTSFieldExperiments LabExperiments High Cs concentrations – Bentonite, Dittrich 2015Low Cs concentrations – Chancellor Colloids Argillite/Crystalline Session of SFWST Working Group Meeting6/23/2016
- 4. Spent Fuel and Waste Science and Technology Methods Mini columns (Dittrich et al., 2015) – Allow for rapid interrogation of sorption parameters with minimal amounts of solid material and waste generation – Allow for multiple columns run in parallel 2 sets of column experiments with Grimsel granodiorite – 137Cs adsorbed to colloids in Chancellor cavity water – Bentonite colloids presorbed with carrier-free 137Cs to study very low concentrations (10-11 M) Measure eluent to determine 137Cs partitioning between the colloidal and dissolved phase – Colloid separation by ultracentrifugation (15,000 rpm) or filtration (0.02 µm) – Colloid concentration by Hach turbidimeter – 137Cs and 3H (conservative tracer) concentrations measured by liquid scintillation counting 4 Argillite/Crystalline Session of SFWST Working Group Meeting6/23/2016
- 5. Spent Fuel and Waste Science and Technology Column Experiments 5 Analysis > Colloid concentration > 137Cs with colloids and in dissolved fraction > 3H concentration Pass eluent through additional columns > Determine slow colloid filtration rates > Determine 137Cs desorption rates Colloid-free solution passed through all columns > Determine desorption and recovery of 137Cs Argillite/Crystalline Session of SFWST Working Group Meeting6/23/2016
- 6. Spent Fuel and Waste Science and Technology Column Experiments 6 Argillite/Crystalline Session of SFWST Working Group Meeting6/23/2016
- 7. Spent Fuel and Waste Science and Technology Batch Desorption Experiments Desorption of 137Cs from colloids in synthetic Grimsel groundwater – What is the desorption rate of 137Cs from colloids in the absence of solids? – Is additional 137Cs desorbed in waters with elevated non-rad Cs concentrations? 7 Argillite/Crystalline Session of SFWST Working Group Meeting6/23/2016
- 8. Spent Fuel and Waste Science and Technology THANK YOU! 8 Argillite/Crystalline Session of SFWST Working Group Meeting6/23/2016