Biogeochemical Modelling of Uranium Immobilization and Aquifer Remediation Strategies Near NCCP Sludge Storage Facilities
| العنوان: | Biogeochemical Modelling of Uranium Immobilization and Aquifer Remediation Strategies Near NCCP Sludge Storage Facilities |
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| المؤلفون: | Nadezhda Popova, K. A. Boldyrev, Anatoly E. Boguslavsky, Albina A. Khvashchevskaya, Alexey Safonov, Olga S. Shvartseva, Olga Gaskova |
| المصدر: | Applied Sciences, Vol 11, Iss 2875, p 2875 (2021) Applied Sciences Volume 11 Issue 6 |
| بيانات النشر: | MDPI AG, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Biogeochemical cycle, Denitrification, 010501 environmental sciences, 010502 geochemistry & geophysics, aquifers, 01 natural sciences, lcsh:Technology, uranyl ion, lcsh:Chemistry, Denitrifying bacteria, chemistry.chemical_compound, Bioremediation, Nitrate, bioremediation, General Materials Science, Instrumentation, lcsh:QH301-705.5, 0105 earth and related environmental sciences, Fluid Flow and Transfer Processes, denitrification, Chemistry, lcsh:T, Process Chemistry and Technology, General Engineering, 16S rRNA analysis, lcsh:QC1-999, Computer Science Applications, Microbial population biology, lcsh:Biology (General), lcsh:QD1-999, lcsh:TA1-2040, Environmental chemistry, Loam, sludge pond, lcsh:Engineering (General). Civil engineering (General), Groundwater, lcsh:Physics |
| الوصف: | Nitrate is a substance which influences the prevailing redox conditions in groundwater, and in turn the behaviour of U. The study of groundwater in an area with low-level radioactive sludge storage facilities has shown their contamination with sulphate and nitrate anions, uranium, and some associated metals. The uranyl ion content in the most contaminated NO3–Cl–SO4–Na borehole is 2000 times higher (1.58 mg/L) than that in the background water. At the same time, assessment of the main physiological groups of microorganisms showed a maximum number of denitrifying and sulphate-reducing bacteria (e.g., Sulfurimonas) in the water from the same borehole. Biogenic factors of radionuclide immobilization on sandy rocks of upper aquifers have been experimentally investigated. Different reduction rates of NO3-, SO42-, Fe(III) and U(VI) with stimulated microbial activity were dependent on the pollution degree. Moreover, 16S rRNA gene analysis of the microbial community after whey addition revealed a significant decrease in microbial diversity and the activation of nonspecific nitrate-reducing bacteria (genera Rhodococcus and Rhodobacter). The second influential factor can be identified as the formation of microbial biofilms on the sandy loam samples, which has a positive effect on U sorption (an increase in Kd value is up to 35%). As PHREEQC physicochemical modelling numerically confirmed, the third most influential factor that drives U mobility is the biogenic-mediated formation of a sulphide redox buffer. This study brings important information, which helps to assess the long-term stability of U in the environment of radioactive sludge storage facilities. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2076-3417 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::038c85da44d104dcdf10e4fea9ba6711 https://www.mdpi.com/2076-3417/11/6/2875 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....038c85da44d104dcdf10e4fea9ba6711 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20763417 |
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