Groundwater Monitoring Data and Screening Radionuclide Transport Modeling Analyses for the Uranium Mill Tailings at the Pridneprovsky Chemical Plant Site (Dneprodzerzhinsk, Ukraine)

Skalskji, Oleksandr; Bugai, D.O.; Voitsekhovitch, O.; Ryazantsev, V. F.; Ávila, R.

doi:10.1007/978-3-642-22122-4_26

Cited by 5 publications

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“…The main reason why 226 Ra has lower mobility in the tailings body is its precipitation with sulfate ions. As shown in a previous study of Marynych, et al [6], there is a high concentration (3.7 -5.6 g/L) of SO 4 2in the pore water. With increasing content of SO 4…”

Section: Radionuclides Vertical Profilesmentioning

confidence: 55%

“…According to the monitoring data collected during 2005 -2017, the uranium activity concentration in the groundwater in the different locations at the tailings body and in different seasons varied in the range from 1 to 5 Bq/L up to 20 Bq/L. This indicates the existence of active processes of the uranium leaching from the tailings body and its capability of migrating into the vadose zone and the groundwater [4]. Other major radionuclides of uranium decay series ( 226 Ra, 210 Pb, 210 Po) were measured in significantly lower concentrations below 1 Bq/L that corresponds to their low mobility in the tailings body experimentally proven by this study using the sequential extraction method.…”

Section: Sampling Depth Mmentioning

confidence: 98%

“…The main constituent anions in the hydrochemical composition of porewater and ground water within the CY tailings are sulfate-ion (up to 2.6 g/L of SO 4 2-) and hydro-carbonate ion (up to 0.9 g/L of HCO 3 -) The mean composition of rainwater, pore water and Quaternary aquifer is listed in Table 2. Precipitation is the only surface water source within the territory of CY tailings, rainwater does not contain such high values of sulfate-ion compared to ground waters.…”

Section: Sampling Depth Mmentioning

confidence: 99%

“…Next drilling companies carried out during 2009 and 2012. The results of studies of this material reported in [1,3,4] allowed to preliminary estimate the vertical profiles of radionuclide distribution in the tailings bodies and consequently to present more accurate radionuclide inventory assessment for the tailings. Physical and chemical speciation of the radionuclides of U/Th series in the tailings materials from this site have also been studied by Protsak and Kashparov [5] and by Marynych et al [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

Korychenskyi¹,

Laptev²,

Voitsekhovych³

et al. 2018

Nucl. Phys. At. Energy

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The results of the study on speciation and mobility of uranium in the ore processing residues in the Centralny Yar tailings (CY, former uranium processing site -Pridneprovsky Chemical Plant in Ukraine) are presented. Due to poor neutralization sludge material was dumped into the tailings body in acidic state. Several incidents with breakage in the pipeline transporting complex radiochemical solutions caused radioactive material spillover onto the tailings surface. Two features of radiological concern were identifiedsecondary contamination of the tailings surface amid elevated gamma dose rates, and excessive migration of radionuclides of U/Th decay series in strong acidic conditions within the tailings body. The monitoring data collected during 2005-2017 showed fast migration of uranium from the tailings body into the groundwater with specific activity varied in the range from 1 to 20 Bq/L. To support this finding the experimental studies aimed to obtain physical and chemical speciation of uranium in the tailings materials in existing and simulated conditions were undertaken. This was conducted by application of modified BCR sequential extraction methods followed by assessment of uranium speciation in equilibrium conditions, using the geochemical modeling tool MEDUSA coupled with the HYDRA database.

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Section: Radionuclides Vertical Profilesmentioning

confidence: 55%

Section: Sampling Depth Mmentioning

confidence: 98%

Section: Sampling Depth Mmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

Korychenskyi¹,

Laptev²,

Voitsekhovych³

et al. 2018

Nucl. Phys. At. Energy

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“…Contaminated facilities of the PChP site were not properly decommissioned. During recent years a number of national and international projects were undertaken aimed at characterization of radioactivity inventory, risk assessment and developing the remedial strategy for the PChP site [1,2]. Zapadnoe tailings operated in the early period of plant functioning, from 1949 to 1954.…”

Section: Introductionmentioning

confidence: 99%

Analysis of spatial distribution and inventory of radioactivity within the uranium mill tailings impoundment

Bugai¹,

Laptev²,

Skalskyy³

et al. 2015

Nucl. Phys. At. Energy

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ANALYSIS OF SPATIAL DISTRIBUTION AND INVENTORY OF RADIOACTIVITY WITHIN THE URANIUM MILL TAILINGS IMPOUNDMENTResults are presented of the characterization of radioactivity inventory of Zapadnoe uranium mill tailings impoundment situated at Pridneprovsky Chemical Plant (PChP; Dneprodzerginsk, Ukraine). Analyses of radioactivity data set based on analytical studies of core material from 15 characterization boreholes allowed significantly refining waste volume and radioactivity inventory estimates. Geostatistical analyses using variogram function have established that radioactivity distribution in Zapadnoe tailings is characterized by regular spatial correlation patterns. Ordinary kriging method was applied to assess distribution of radioactivity in 3D. Results of statistical analyses suggest significant redistribution of uranium in the dissolved form in the residues (presumably due to water infiltration process). The developed structural model for radioactivity distribution is used for further risk assessment analyses. Derived radioactivity correlation scales can be used for optimization of sample collection when characterizing the PChP Site and similar contaminated sites elsewhere.

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Assessment of Temporal and Space-Time Changes of Groundwater Chemical Composition at the “Рridniproivsky Chemical Plant” Uranium Production Legacy Site

Lavrova¹,

Korychenskyi²,

Voitsekhovych³

2022

HHH

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This study provides an analysis of data from long-term (2005-2021) observations of the chemical composition of groundwater in the impact zone of the former uranium ore processing enterprise (Production Union Prydniprovskyi Chemical Plant (PU “PChP”) in the city of Kamianske, in particular, areas of near-surface tailings of uranium ore processed residues (“Zapadnoe”, “Central Yar” and others). All tailings on the site of the former PU “PChP” were built without installation of anti-permeable barriers, and therefore under the influence of atmospheric precipitation, the water, formed in the tailings body, highly contaminated of uranium series radionuclides and residues of chemical reagents, can penetrate to the groundwater aquifers, with which they spread beyond the limits of their technological localization in tailings. In addition, the entire territory of the former industrial site of mining and chemical production “PChP” is a complex of former enterprises, septic tanks, production waste holding sites, warehouses of chemical reagents and residues of former production, which are also sources of man-made pollution of the territory and influence on chronic pollution of groundwater. Therefore, environmental monitoring programs in the impact zone of tailings impoundments included not only monitoring of indicators of the content of uranium series radionuclides in elements of the natural environment, but also studying of the chemical composition of waters. The analysis of observation data during the period from 2005 to 2021 was carried out in order to assess the extent of the spread of polluted waters beyond the limits of the location of the tailings ponds, to identify major macroions in the composition of groundwater as indicators for assessing the spread of the contamination plume beyond the boundaries of the tailings ponds, as well as to identify patterns of formation the groundwater quality within the site under the influence of man-made and natural factors. It is shown that the mineralization of groundwater, as well as its chemical composition, significantly changed as the sampling site moved away from the tailings. Changes in the chemical composition of water and the dominant content of the major macroions at different distances from the tailing’s ponds made it possible to determine the difference in the characteristics of the influence of infiltration waters from the source of the tailing’s ponds and scattered sources of pollution within the boundaries of the PChP site along the groundwater flow line. The main factors of uncertainty in the estimations of the formation of groundwater chemistry in the zone of the industrial complex are shown, which must be taken into account for the development of the network of monitoring observations.

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Groundwater Monitoring Data and Screening Radionuclide Transport Modeling Analyses for the Uranium Mill Tailings at the Pridneprovsky Chemical Plant Site (Dneprodzerzhinsk, Ukraine)

Cited by 5 publications

References 0 publications

Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

Analysis of spatial distribution and inventory of radioactivity within the uranium mill tailings impoundment

Assessment of Temporal and Space-Time Changes of Groundwater Chemical Composition at the “Рridniproivsky Chemical Plant” Uranium Production Legacy Site

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