High intensity of technological impact on all components of the environment is due to high toxicity of chromium-containing wastes and heavy oil fractions produced at plants of the oil and gas industry. Annual costs of plants on dumping of toxic chromium-containing wastes make up billions of rubles but they cannot stabilize the situation: the number of accidents and incidents during   the disposal of toxic wastes is rising. Nobody takes into account the fact that chromium-containing wastes and   heavy oil fractions can be considered as valuable raw material for preparation of a variety of materials with improved physical - mechanical properties. It is very important for Russia, as well as for Tyumen region, which has the largest reserves of oil and gas - natural hydrocarbon raw materials to produce commercial oil products – to ensure environmental safety while disposing   toxic chromium-containing wastes and heavy oil fractions. The topicality of the work is defined by the following factors: toxic wastes are generated at petrochemical plants of Russia in large quantities (LLC "Tobolsk-Neftekhim", JSC "Nizhnekamskneftekhim", JSC "Uralorgsintez", LLC "Stavrolen" and JSC "Kazanorgsintez", and others). They badly influence the environment but their chemical composition contains valuable components and they have zero net price. It is necessary to note that in the nearest future the accumulation of hazardous wastes will increase, we face a real threat of toxic environmental pollution of groundwater, rivers, seas and soils in the areas of waste disposal which enhances the crisis of oil and gas industry.

We have developed a new method for decontamination of toxic chromium-containing wastes- alyumochromium catalyst. The method is confirmed by the mathematical relationship between a dose of hydrazine (2,2 ÷ 3%); temperature (70 ÷ 90 ° C); time (1 ÷ 1,45 hours) and 100% degree of neutralization of wastes. The method provides reduction of grounds for waste disposal, reduction of the risk of soil pollution, groundwater contamination with chromium compounds (+6) affecting the health of the population. We have revealed the dependence of the effect of the reduced chromium-containing waste - alyumochromium catalyst - on the quality of some materials performance  ( 6,4 ÷ 12,5 wt.% for asphalt concrete of type B; 20 ÷ 40 wt.% for oil, mineral paints; 58 ÷ 70% wt. % for primer, putty). These results are able to ensure the development of resource-saving technologies, reduction of environmental risks in the oil and gas industry.

The developed technique of utilization of heavy oil fractions by oxidative thermal degradation has also shown high efficiency. This method helps reduce carbon dioxide emissions into the atmosphere and produce bitumen varnish - anticorrosion coating (heating of raw materials up to 200 ÷ 300 ° C, air flow rate 1000 ÷ 1500 m3 / h,  time - 5 hours). The developed recipes of preparation of commercial products from heavy oil fractions and reduced toxic chromium-containing wastes, such as asphalt, bitumen lacquer, bituminous resins, paints have received practical approbation. The topicality of the developed technique is proved by substantial economic benefits, which shows a possibility for companies to eliminate systematic waste of secondary resources and to create waste-free industrial territorial complexes and save the cost of the construction of waste disposal bins. The use of reduced toxic chromium-containing waste - alyumochromium catalyst- in the composition of paints, asphalt concrete makes it possible to increase the proportion of waste in general  balance of raw materials, the share of manufactured products in the total production volume; it enables plants to ensure the quality and durability of pavements used under different conditions.

We based our work on works of domestic and foreign scientists who laid the strategy for implementation of low-waste production, risk analysis and reduction of accidents likelihood at hazardous plants of the oil and gas industry. We used modern methods of planning a full factorial experiment with the estimate of the coefficient of reproducibility and statistical significance of the results on Student's and Fisher's criteria. The reliability of scientific statements and conclusions on the use of toxic wastes to produce commodity products is proved by satisfactory correlation of the theoretical data with the results of the analysis of some experiments.

2. Egorov A. N. The use of heavy petroleum fractions as waste oil refining for the production of bituminous varnish. The conference proceedings. V. I. Shpilman –Khanty-Mansiysk: LLC "Ugra format", 2014. – P. 189 – 194.