Nuclear waste disposal: I. Laboratory simulation of repository properties

Grambow, Bernd; Landesman, Catherine; Ribet, Solange

doi:10.1016/j.apgeochem.2014.05.017

Cited by 21 publications

(8 citation statements)

References 23 publications

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“…it is difficult to directly analyze it in-situ, and to sample it without potential alteration [22]. Experimental data of porewater composition have been obtained by water sampling with borehole instrumentation [23], extraction using squeezing techniques [24], and liquid displacement with a solution of known composition [25]. These data are often complemented with geochemical modelling assuming that the dissolved ions in porewater have the same activity coefficients as in bulk water [25][26][27][28][29].…”

Section: Studying the Porewater Chemistry In Compacted Bentonite Is Cmentioning

confidence: 99%

Calcium carbonate precipitation in compacted bentonite using electromigration reaction method and its application to estimate the ion activity coefficient in the porewater

Rachmadetin

Mizuto

Tanaka

et al. 2019

Journal of Nuclear Science and Technology

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In the safety assessment of radioactive waste disposal, it is critical to understand the porewater chemistry in compacted bentonite in order to predict long-term migration behavior of radionuclides in the engineered barrier. This study estimates the activity coefficients of dissolved ions in the porewater of compacted bentonite from the concentrations of ions at which CaCO3 precipitation occurred. Solutions containing CaCl2 and NaHCO3 were introduced under electrical potential gradient from the opposite sides of the compacted Na-bentonite packed at the dry density of 1.0 kg/dm 3. After the electromigration, the spatial distribution of ions along the compacted bentonite sample was determined. Sequential extraction method was developed to distinctly determine the concentrations of free ions in the porewater and in solid phase in bentonite. The results show that the exchangeable Na + ions were progressively replaced by the incoming Ca 2+ ions, and the compacted bentonite sample can be divided into three zones: Ca-, Ca-/Na-, and Na-bentonite zones. Precipitates of CaCO3 were observed both in Ca-and Ca/Na-bentonite zones. The experimentally determined activity coefficients were at least smaller by a factor of three compared to the theoretical approximation calculated using PHREEQC code assuming dilute-solution conditions with no electrostatic interactions between ions and bentonite surface.

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Section: Studying the Porewater Chemistry In Compacted Bentonite Is Cmentioning

confidence: 99%

Calcium carbonate precipitation in compacted bentonite using electromigration reaction method and its application to estimate the ion activity coefficient in the porewater

Rachmadetin

Mizuto

Tanaka

et al. 2019

Journal of Nuclear Science and Technology

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“…In addition, injection of tracers and the record of their breakthrough, or the elution of elements present initially in the sample, make it possible to derive a range of parameters for transport, adsorption/desorption, and dissolution/precipitation reactions using a reactive transport approach (Grambow et al 2014;Montavon et al 2014;Mäder and Waber 2017;Mäder 2018). Reactive transport modeling of advective displacement experiments have been carried out in a handful of studies with the consideration of the presence of a diffuse layer and the dual continuum model described in a previous section (Grambow et al 2014;Alt-Epping et al 2015, 2018. In all of these studies, a simplifying approximation was made: the porosity affected by the advective fl ow was set to the same exact value as the initial bulk porosity defi ned with the dual continuum model (Fig.…”

Section: Beyond Diffusion Couplings With Advective Flow Advective DImentioning

confidence: 99%

Reactive Transport Modeling of Coupled Processes in Nanoporous Media

Tournassat

Steefel

2019

Reviews in Mineralogy and Geochemistry

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“…However, in case of circularity, it does not stand so firm, as the analysis also proves. It employs linear processes, and the production of nuclear waste creates a massive amount of externalities (and their effects are not taken into consideration in many analyses) [16].…”

Section: Cev Values Of the Olympic Village's Energy Supply Scenariosmentioning

confidence: 99%

A Circular Evaluation Tool for Sustainable Event Management – An Olympic Case Study

2018

APH

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This paper introduces a pilot project, which focuses on solar energy usage through the implementation of circular energy-sharing solutions, by event management. The conducted research examines the possibility of constructing a solar power park for a possible Olympic village. The study demonstrates a newly developed methodology which has been created to measure the circular efficiency of similar events. The analysis also elaborates on innovative business and technological solutions for developing solar energy schemes, which can be applied to circular principles and lead to further social-economicenvironmental benefits. According to the findings, the current energy infrastructure is not always suitable for improvement to higher development levels. The structure itself requires fundamental changes in order to enhance the sustainable and circular performance. Thus, pilot projects are required, as a first step, to implement similar technological and business salutations. In the case of earlier Olympics sustainable or carbon strategies, instead of long term planning, was important to focus for the short term thinking and management actions (carbon and ecological footprinting). The implementation of such novelties (circular principles), at highly anticipated events, could contribute to spreading closed structured, circular thinking in the future.

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Nuclear waste disposal: I. Laboratory simulation of repository properties

Cited by 21 publications

References 23 publications

Calcium carbonate precipitation in compacted bentonite using electromigration reaction method and its application to estimate the ion activity coefficient in the porewater

Calcium carbonate precipitation in compacted bentonite using electromigration reaction method and its application to estimate the ion activity coefficient in the porewater

Reactive Transport Modeling of Coupled Processes in Nanoporous Media

A Circular Evaluation Tool for Sustainable Event Management – An Olympic Case Study

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