Natural Science Institute, Perm State University, Perm, Russia:

N. G. Maksimovich, Deputy Director of Scientific Work, Associate Professor, Candidate of Geologo-Mineralogical Sciences, nmax54@gmail.com
O. Yu. Meshcheryakova, Senior Researcher, Candidate of Engineering Sciences

Tula State University, Tula, Russia:
N. M. Kachurin, Head of a Chair, Professor, Doctor of Engineering Sciences

The article addresses the problem of pollution of gypsum mining sites during oil recovery in the same area. The process of purification is complicated by numerous karst voids. The mechanism of oil pollution means that a lens of oil forms on the surface of fracture-and-ground water as the pollutant freely flows under conditions of absent overburden, highly developed porosity and due to formation of hydrodynamic trap in the shoreland when soluble oil products flow with underground water with the subaqueous discharge in water basins. In connection with this, the model of the pollutant permeation and diffusion through a gypsum bed is developed. The technology of oil protection of sulphates has been trialed and patented; the technology accounts for features of oil pollution and specific requirements imposed on removal of a pollution source located nearby a large water basin, and includes two approaches: pumping of oil from the lens on the surface of underground water without water discharge on the ground surface and biological destruction of oil products by activated native microorganisms. The article illustrates the efficiency of the proposed technology: high-rate removal of oil products, availability of pumped oil for further treatment, low cost of the microbiological method, short payback time and possibility of development of a cleaned-up promising deposit, which will enlarge economic resource base and exert favorable effect on the regional economy of West Ural. After the adequate treatment of a polluted area is performed, due to revealing the described pollution mechanism, it is possible to start development of gypsum deposits.
This study has been supported by the Russian Foundation for Basic Research, Project No. 16-35-00104 mol_a, entitled “Hydrocarbon Migration by Permeation and Diff usion in Karst Areas”, and by the Ministry of Education and Science of the Russian Federation, in the framework of the basic part of the Governmental Contract No. 2014/153 No. 269.

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