Biogeochemical Modelling of Uranium Immobilization and Aquifer Remediation Strategies Near NCCP Sludge Storage Facilities

Nitrate is a substance which influences the prevailing redox conditions in groundwater, and turn behaviour of U. The study groundwater an area with low-level radioactive sludge storage facilities has shown their contamination sulphate nitrate anions, uranium, some associated metals. uranyl ion content most contaminated NO3–Cl–SO4–Na borehole 2000 times higher (1.58 mg/L) than that background water. At same time, assessment main physiological groups microorganisms showed maximum number denitrifying sulphate-reducing bacteria (e.g., Sulfurimonas) water from borehole. Biogenic factors radionuclide immobilization on sandy rocks upper aquifers have been experimentally investigated. Different reduction rates NO3?, SO42?, Fe(III) U(VI) stimulated microbial activity were dependent pollution degree. Moreover, 16S rRNA gene analysis community after whey addition revealed significant decrease diversity activation nonspecific nitrate-reducing (genera Rhodococcus Rhodobacter). second influential factor can be identified as formation biofilms loam samples, positive effect U sorption (an increase Kd value up to 35%). As PHREEQC physicochemical modelling numerically confirmed, third drives mobility biogenic-mediated sulphide buffer. This brings important information, helps assess long-term stability environment facilities.