Institute of Geology of the Karelian Research Centre of RAS (Petrozavodsk, Russia):

Myasnikova O. V., Researcher, Candidate of Engineering Sciences, okmyasn@krc.karelia.ru
Bubnova T. P., Researcher, bubnova@krc.karelia.ru

The aim of the research was to study the crushing screenings of gabbrodolerite, quartzite sandstone, and quartzite stored in the pit dumps in the Prionezhsky District of Karelia in order to assess their applicability as non-traditional filtering media in water treatment for the removal of various pollutants. The use of optical microscopy and X-ray diffraction analysis allowed establishing qualitative and quantitative mineral compositions of the screenings studied. According to the results of the study of physical and chemical parameters and the total specific effective activity of natural radionuclides in the screenings, the 0.5–2.0 mm fraction meets the requirements set by the standard for natural granular filtering materials. A comparison of the materials studied with quartz sand (provided by CJSC Pogranskoye Quarry Association) confirmed that their filtering media porosity and grain shape coefficient values are not inferior to those of the standard material. The bulk density of the screenings at 1307–1550 kg/m³ is comparable to the density of the sand at 1650 kg/m³. It seems reasonable to place these screenings in the lower layer of two-layer filter systems and to use them for water clarification and for the removal of mechanical impurities and iron from water. The 2–5 mm fraction of the screenings studied may be used as a loose anti-icing material for treating road surfaces in winter. Introduction of screenings as non-traditional filtering media for water treatment at local mining enterprises contributes to more comprehensive deposit development and helps solving certain economic and environmental problems in the region.

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