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Bratsk, Russia

Elsukov V.K.,Bratsk State University
Thermal Engineering (English translation of Teploenergetika) | Year: 2010

Environmental indicators of the natural gas combustion process are studied using the model of extreme intermediate states developed at the Melent'ev Institute of Power Engineering Systems. Technological factors responsible for generation of polycyclic aromatic hydrocarbons and hydrogen cyanide are revealed. Measures for reducing the amounts of polycyclic aromatic hydrocarbons, hydrogen cyanide, nitrogen oxide, and other pollutants emitted from boilers are developed. © 2010 Pleiades Publishing, Ltd. Source

Vardanjan M.A.,Bratsk State University
Water and Ecology | Year: 2014

The typical features of oil containing water flows are composition impermanence and concentration of polluting oil products as well as presence of solid clay suspended substances in water on which oil products selectively sorb. Traditionally treatment from oil products is a technology with consistent use of different physico-chemical processes which final process is a two-stage filtration through granular materials. However, efficient and rational methods of filter beds regeneration are not developed and, particularly, such beds as heattreated antrafilt and activated carbon. Used material is unloaded with difficulty that causes extra problems with its hand unloading.To find an acceptable substitution of heattreated antrafilt and activated carbon powder, fibrous and granular materials able to remove oil products from wastewaters were investigated.The article presents the results of author’s long-termed researches on study of expanded perlite potential for use in the pressure bulk filter in the process of oil containing wastewaters treatment. The laboratory studies on filter-sorbing properties of expanded perlite with a view to deep fine treatment of oil containing waters are carried out. The effect of fractional composition of expanded perlite, concentrations and oil products phase state in water, temperature, hydrodynamic conditions as well as sorbent contact time with feedwater on the degree of extraction of oil products is identified. The application field of different fractions of this material are defined: for a rough mechanical treatment up to concentration of 2 mg/l — mixture of coarse fraction of 5–15 mm when for a fine sorption treatment up to 0,3 mg/l — mixture of finefraction of 2–5 mm. In the dynamic conditions the oil capacity of expanded perlite fraction mixture of 2–5 and 5–15 mm is defined. It respectively makes 0,40 è 0,39 g/g while some part of oil products has been absorbed by the material irreversibly. On the base of the investigations the source data of oil containing wastewaters treatment technologies development where the layer of expanded perlite of relevant fraction will be used as a bed for industrial filters of coarse and fine treatment is defined. Source

Yanyushkin A.S.,Bratsk State University | Saprykina N.A.,Tomsk Polytechnic University
Applied Mechanics and Materials | Year: 2014

The article considers the problem of diamond disk efficiency when processing hard-alloy materials. Special attention is paid to the composition of greasy layer and mechanism of protective membrane formation on the surface of diamond disks. It is known that there are possibilities for blocking greasy layer and increasing cutting properties of metal-bonded diamond disks when polishing hard alloys. © (2014) Trans Tech Publications, Switzerland. Source

Vardanian M.A.,Bratsk State University
Water and Ecology | Year: 2016

The testing of expanded perlite in industrial pressure bulk filters of the Armenian Nuclear Power Plant oily wastewater treatment system instead of activated carbon and crushed heat-treated anthracite is carried out. The following important process performance is found out: during the filtration in industrial equipments particles of expanded perlite are floating; a bed volume reduction due to the reorientation of sorbent particles makes 15%; at the discharge of 6–7m3/m2 -h the bed hydraulic resistance does not exceed 2 atm; a sorbent free volume makes 30% on average, while a contact time with the sorbent at the stated discharge makes 9–4 minutes; an oil content in water after treatment by mechanical filters with the 5–15-mm fraction mixture expanded perlite beds does not exceed 2mg/l at their initial concentration of 2,5–15; the fine filters with the 2–5-mm fraction mixture expanded perlite beds purify polluted water from oil up to 0,3 mg/l – «absence». It is also found out that the use of expanded perlite at the stage of tertiary wastewater treatment avoids the need to intensify the flotation process by adding a coagulant. Besides, a substitution of activated carbon and crushed heat-treated anthracite in industrial pressure bulk filters for expanded perlite allows improving the hygiene-and-sanitary working conditions of the staff members at the stages of charge and discharge of the sorbent. © 2015, Water and Ecology. All rights reserved. Source

Yanchenko N.I.,Irkutsk State University | Baranov A.N.,Bratsk State University
Russian Journal of Non-Ferrous Metals | Year: 2010

The parameters of the distribution of fluorine, sodium, and sulfate ions in the environment surrounding the Baikal region are considered using Bratsk as an example. Their contents in atmospheric precipitation (rain, snow, aerosol, and snow cover) and the intensity of load on the territory in 2008-2009 are determined. The results are obtained based on snow-chemical recording and sampling single specimens of atmospheric fallout and aerosols. A map of pollution of the snow cover with water-soluble fluorine is presented and the power of the source of emission of hydrogen fluoride is evaluated. It is suggested to decrease the emissions of HF by applying lithium additives in the form of fluorine-containing lithium salts obtained with the use of lithium brines of Eastern Siberia. © 2010 Allerton Press, Inc. Source

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