The results of laboratory and industrial research on plasticity increase of products made of composites based on recycled thermoplastic polymers with the addition of the developed plasticizer composition are presented. Experimental studies were carried out in laboratory conditions on the basis of Tyumen Industrial University, and the industrial version was developed on the production site of the plant Neocom LLC. The technology of production of finished products (sewer manhole covers) on the basis of polymer-sand composite and plasticizer was realized.

The efficiency of application of calcium-containing reagents (calcium oxide, calcium hydroxide, calcium peroxide) for removal of phosphate ions from waste water was evaluated. It has been established that calcium oxide (99,78 %) and calcium hydroxide (99,80 %) were the most effective ones for dephosphorization; the efficiency of calcium peroxide was 90,0 %. The changes of COD and pH indicators depending on the concentration of dephosphorizing reagents added to wastewater were experimentally investigated. Conclusions about the efficiency of calcium-containing reagents application are formulated.

A physicochemical model of the recycling process of electric steelmaking dusts (ESM) with obtaining granulated pig iron and ZnO has been developed. The principal possibility of ESM dust processing by the proposed technology has been demonstrated. According to the model it is revealed that the main compounds in pig iron are Fe3C, Fe and FeS with the content, % by mass, respectively: 95,1 Fe; 4,89 C; 0,01 S, and in zinc-containing fumes, ZnO prevail with content 65,43 % by mass. The obtained modeling data are confirmed by the results of laboratory experiments on charge melting.

Studies of CO₂ sorption by composite sorbents containing the active component (branched polyethylenimine) dispersed in the pores of mesoporous support (silica gel) have been carried out. It is shown that as silica gel pores are filled with polyethylenimine, the sorption efficiency of CO₂ by the active component decreases, and the dynamic sorption capacity per 1 g of material passes through a maximum. The enthalpy values of CO₂ sorption by composite sorbents have been determined. It is shown that the enthalpy values of CO₂ sorption depend on the proportion of pore filling by the active component and on the characteristics of the porous structure of the support. Thermal energy consumption for regeneration of composite sorbents within the adsorption cycle was analyzed.

The disadvantages of existing technologies of landfill degassing are marked: at passive degassing there are no technological possibilities of biogas flow control in time at change of conditions of its formation in the process of biochemical fermentation and change of its chemical composition, and at active degassing of the landfill the volume of extracted gas from the body of the landfill cannot be significantly increased and accordingly the efficiency of technical methods at realization of the given method remains reduced. The technology of landfill degassing is proposed, which provides reduction of negative impact on the environment by controlling the flow rate and chemical composition of biogas emissions into the atmosphere, both during the operation of the landfill, and during the period of reclamation, and after it until the cessation of gas generation of the landfill body.

The distribution of uranium in the water-rock system in contrast hydrogeological conditions of granitoid massifs, contact zones and different-aged sedimentary complexes of the Ob-Zaisan orogen is considered. It was revealed that the uranium content in waters varies from 6.71・10^-4 to 1162.81 μg/dm3, and γ (²³⁴U/²³⁸U) values range from 1.3 to 18.0. The maximum values of ²³⁴Ue were recorded in waters sampled within the granitoids of the Ob and Barlak complexes, which are the main sources of uranium in natural waters of the studied region. It is shown that the data on waterbearing rocks confirm these facts, namely, the average uranium concentrations vary from 2.6 g/t in sedimentary rocks to 9.6 g/t in magmatic rocks. At the same time, intrusive complexes of the Kolyvan granitoid massif are the most enriched with uranium (up to 65.1 g/t).

An ecological survey of the areas of the Angara A5 launch vehicle separation parts fall before and after its launch from the Plesetsk Cosmodrome in 2014, 2020 and 2021 was carried out. The acidity, Eh, ionic composition (Ca²⁺, Mg²⁺, HCO₃^–, Cl^– и SO₄^2–), mineralization, COD, content of petroleum products and kerosene in snow samples after melting were determined. In the surface layer of air, the concentrations of NO, NO₂, CO and kerosene content were determined in real time using the gas analyzer “GANK-4”. It is concluded that chemical pollution of snow cover and surface layer of atmospheric air in the areas of the Angara A5 launch vehicle separation parts fall has not been revealed, and there is only insignificant local mechanical pollution of landscapes by elements of structures with damage to vegetation and soil cover in the places where fragments of the launch vehicle's separation parts fell.

Data on the activity of model bimetallic catalysts 1%Rh5%Co/ZrO₂, 1%Rh5%Cu/ZrO₂ and 1%Rh1.5% MnOx/SiO₂ in the hydrogenation of renewable citral under mild conditions (70 °C, 10 atm gauge H₂) have been obtained. It is shown that the citral hydrogenation rate increases in the series RhCu/ZrO₂ < RhMnOx/SiO₂ < RhCo/ZrO₂, reaching selectivity to citronellal of 70, 78 and 84 %, respectively, at citral conversion of 46 %. It is hypothesized that the presence of impurities of Co, Cu, Mn, silicon oxide and reduced oxides will not affect the hydrogenation activity of Rh in spent autocatalysts.

The problem of anthropogenic mercury pollution of the atmosphere of the Barnaul urbanized territory in the period 2016–2023 is considered. It is revealed that Hg concentration in atmospheric precipitation varied in a wide range of values: from <1 to 130 ng/l (volume-weighted concentration – 13.0 ng/l). HYSPLIT models backward trajectories of air masses movement in different seasons of the year were built, which showed the presence of both regional sources of Hg input (coal combustion at TPPs during the heating period) and transboundary Hg transfers from the territories of Central Asia, Europe and the Arctic. It was found that Hg concentrations in the snow cover of urban and background areas differ more than 3 times: 11.5 and 3.7 ng/l, respectively. It is noted that Hg concentrations in urban snow cover are 10.9–41.9 % lower than its values in precipitation sampled taken at the experimental site of IWEP SB RAS.

The condition of river mouths of Vaygach Island (Nenets Autonomous Area), in particular the Krasnaya River, where in the first half of the last century lead-zinc ores were mined without observing nature protection measures and reclamation after the mine conservation. It was revealed that in the mouth of this river there is an accumulation of heavy metals in bottom sediments and aquatic vegetation. Lead content in algae was found to be 4.8 times higher than the sanitary norm. It is recommended that wastewater from mines should be discharged to deep sea areas with salinity over 20 ‰ or discharged into drainless thermokarst lakes, which have no ichthyofauna and freeze to the bottom in winter.

The incidence of malignant neoplasms (MN) in the population living in the ecologically unfavorable town of Gornyak, Loktevsky district, Altai Territory, in the zone of exposure to technogenic chemicals for the period from 2019 to 2023 was assessed. Anonymized data and operational information on first-time and morphologically verified cases of MN were studied. The incidence rates of MN in the population of this city were calculated and its structure was evaluated. A higher rate of MN morbidity among the male population of Gornyak was noted, with the prevalence of bronchial and pulmonary MNs in the structure of morbidity (among the male population – 25%, among the female population – 6%), the incidence of colorectal MNs was recorded, which in the female population is in second place and is detected 3 times more often than in the male population. It is concluded that there is a significant difference in the structures of MN morbidity in male and female population.