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PROGNOSIS OF CONTAMINANTS MASS TRANSPORT IN GROUNDWATER AFTER CESSATION OF URANIUM MINING IN MOMINO DEPOSIT (SOUTH BULGARIA)
Abstract
Significant parts of important aquifers in Bulgaria are affected by the long-term in-situ leaching of uranium, using acid in borehole systems with reinjection. This is the case with the Momino uranium deposit formed in the lower part of the Neogene-Quaternary sedimentary complex, filling the Thracian depression. In this complex is formed one of the main sources of water supply in this part of the country. In order to assess the actual status and to predict the future changes in the quality and composition of the groundwater in the region of the deposit, mathematical models of the Neogene-Quaternary aquifer complex on an area of over 1000 km2 are developed. Using the Modflow software, a basic 3D flow model of hydrogeological conditions in the area of the deposit is developed, taking into account the exploitation of groundwater in the region. Based on the compiled basic flow model, using MT3D-MS computer program, mass transport 3D models are developed to predict the movement of conventional, prior and radioactive contaminants after cessation of uranium extraction, by the example of sulfate ion, arsenic and uranium dioxide. Utilizing the mass transport models, maps are created to illustrate the spatial extent and intensity of groundwater contamination for different periods up to 2030.
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References6
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