Assessment of the long-term safety of radioactive waste disposal: 1. Paleoreconstruction of groundwater formation conditions

Tokarev, Igor; Zubkov, A.A.; Rumynin, Vyacheslav G.; Pozdnyakov, S. P.; Polyakov, V. A.; Kuznetsov, V. Yu.

doi:10.1134/s0097807809020092

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…Due to its toxicity, nitric acid is not used in the chemical industry for the production of modified materials. Currently in Russia, there are plants that still dump liquid radioactive waste into deep layers of geological structures and in artificial surface repositories [33][34][35][36][37]. Nitric acid is used to prepare liquid radioactive waste for disposal.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

et al. 2017

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This paper discusses the mechanism of montmorillonite structural alteration and modification of bentonites' properties (based on samples from clay deposits Taganskoye, Kazakhstan and Mukhortala, Buriatia) under thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). Treatment conditions were chosen according to those accepted in chemical industry for obtaining acid modified clays as catalysts or sorbents. Also, more intense treatment was carried out to simulate possible influence at the liquid radioactive site repositories. A series of methods was used: XRD, FTIR, ICP-AES, TEM, nitrogen adsorption, and particle size analysis. It allowed revealing certain processes: transformation of montmorillonite structure which appears in the leaching of interlayer and octahedral cations and protonation of the interlayer and -OH groups at octahedral sheets. In turn, changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant alterations in the properties: reduction of cation exchange capacity and an increase of specific surface area. Acid treatment also leads to a redistribution of particle sizes and changes the pore system. The results of the work showed that bentonite clays retain a significant portion of their adsorption properties even after a prolonged and intense thermochemical treatment (1 M HNO 3 , 60 • C, 108 h).

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

et al. 2017

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“…Азотная кислота ввиду своей токсичности не используется в химической промышленности для производства модифицированных материалов. При этом на территории Российской Федерации на настоящий момент еще действуют объекты захоронения жидких радиоактивных отходов, изоляция которых производится в глубокие слои геологической среды, а также в открытые поверхностные бассейны (Rybalchenko et al, 1998(Rybalchenko et al, , 2005Zubkov et al, 2005;Tokarev et al, 2009;Utkin, Linge, 2016). При подготовке жидких радиоактивных отходов к изоляции используют азотную кислоту.…”

Section: преобразование структуры и адсорбционных свойств монтмориллоunclassified

Transformation of the montmorillonite structure and its adsorption properties due to the thermochemical treatment

et al. 2019

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Complex studies revealed changes in the composition, structure, and properties of bentonite clays from the Taganskoye (Kazakhstan) and Dashkovskoe (Moscow region) deposits due to the thermochemical treatment. The leaching of cations from the interlayer and octahedral positions, protonation of the interlayer and OH-groups, leads to modification of the interlayer and 2:1 layer composition, which in turn contributes to significant changes in properties:-a decrease in the cation exchange capacity due to a decrease in the layer charge and increase in the specific surface due to destruction and partial amorphization. Bentonites from the Dashkovskoye deposit demonstrated higher resistance to thermochemical treatment than the bentonites from the Taganskoye deposit due to the protecting effect of the organic matter. Results of the work showed that even after quite intensive thermochemical treatment (13M HNO3, 90 °C, 5 hours), bentonite clays retain a significant part of the adsorption capacity.

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“…Micropaleontological studies referred to by the authors of this study were published in the works of a group of scientists from Tomsk [25,26]. Modeling of the filtration and capacitance parameters is given in the works of Pozdnyakov et al [27,28].…”

Section: Introductionmentioning

confidence: 99%

Transformation of the Geological Environment under the Influence of Liquid Radioactive Waste (Russian Experience in Studying Historical Nuclear Disposal)

Krupskaya,

Zakusin,

Chernov

2024

Minerals

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Due to various historical events, in the Russian Federation, in addition to the radioactive waste storage facilities used in world practice, there are various nuclear and radiation hazardous facilities that require special procedures for monitoring and decommissioning. One of these facilities is the disposal site for LRW on the territory of the JSC Siberian Chemical Plant, where specially prepared waste is injected into sand reservoirs lying at depths of 300–350 m between clayey strata. This study examines in detail the features of the lithological and mineral composition of reservoir sands and aquitards. The processes of environmental transformation in reservoir sands, which lead to changes in the composition and structure of rocks, were characterized. These processes manifest themselves in the form of the development of leaching zones and their “healing” with newly formed smectite, the destruction of terrigenous grains, including the development of cracks, and the growth of newly formed smectite in the pore space of reservoirs. The forms of occurrence and localization of authigenic smectite formed as a result of technogenic impact are described. It has been shown that, despite the obvious impact of highly reactive solutions accompanying liquid radioactive waste, the insulating properties of the geological environment are maintained and even improved to some extent.

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Assessment of the long-term safety of radioactive waste disposal: 1. Paleoreconstruction of groundwater formation conditions

Cited by 12 publications

References 5 publications

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

Transformation of the montmorillonite structure and its adsorption properties due to the thermochemical treatment

Transformation of the Geological Environment under the Influence of Liquid Radioactive Waste (Russian Experience in Studying Historical Nuclear Disposal)

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