The composition of landfill gas of the Torbeevo landfill was studied, technological modes of obtaining protein biomass (haprin) from purified landfill gas were determined.

The environmental problems of alumina production, caused by the formation of waste gas treatment plants are considered. The phase and chemical composition and microstructure of dust from gas treatment facilities of thermal power plants has been studied. It has been suggested to use gas-cleaning plant wastes as active mineral additives in road mixtures. The possibility of using electrofilter dust as a mineral powder for asphalt concrete has been experimentally verified. It has been established that the properties of asphalt concrete using the dust from gas cleaning facilities of heat-power equipment of alumina production are practically the same as those of asphalt concrete prepared on the crushed limestone rock of Mazul limestone mine.

The possibility of processing lignosulfonates to obtain composite materials using ED-20 epoxy resin as a binder was considered. It was shown that powdered lignosulfonates (PLS) play the role of a hardener for epoxy resins and reduce the toxicity of polyethylenepolyamine (PEPA), which is widely used as an industrial hardener, by 50–68 %. The article assesses the possibility of using PLC as a hardener and filler composition. The optimal composition of lignoepoxy compounds was revealed: ED-20 – 60–70 % by weight; PLS – 30–40 % by weight; PEPA – 6–7 % by weight. Biotesting proved that the resulting material does not have toxic properties. It was discovered that these compositions have longterm biostability while maintaining physical and mechanical properties. It was concluded that it is expedient to process powdered lignosulfonates to obtain lignoepoxy compositions suitable as building material and alternatives to wood chip and wood fiber materials.

The treatment of wastewater from hexavalent chromium ions was studied and a two-stage (reagent) purification method was developed for this purpose. It was concluded that the possible effectiveness of this wastewater treatment at small and medium-sized production sites, especially in the absence of general industrial treatment facilities.

The possibility of processing low-cost types of biomass, including sawdust, into oxygen-free hydrocarbon fuel was studied. Synthesis of liquid fuel was performed by slow pyrolysis of plant raw materials under pressure. It was revealed that the resulting liquid fuel had a higher volatility than the feedstock and an increased fuel calorific power compared to conventional biofuels, which was explained by deoxygenation. The possibility of producing oxygen-free liquid fuel from vegetable raw material was substantiated. It was proposed to use produced oxygen-free liquid fuels instead of mineral fuels for sustainable development.

The results of assessing the soil-ecological efficiency of reclamation activity on different ages coal dumps in the forest-steppe of Kuzbass are presented. The main physical and chemical soil properties were studied: density, clay fraction and organic carbon in the areas of forestry and agricultural reclamation measures and natural overgrowing. It was revealed that the maximum efficiency achieves by technologies of the fertile layer of natural soils application on the surface of dumps (more over 80% of efficiency).

The mechanism of environmental monitoring, a model and a system for evaluating data obtained using an automated environmental monitoring system for atmospheric air pollution, which describes the evolution of a variable measured over the same sampling period as a non-linear function of past evolutions are considered. The object of research is the system of automated monitoring of atmospheric air pollution in industrialized regions. The subject of the study is the mechanisms for conducting environmental monitoring and models for evaluating automated monitoring data.

Physical and chemical properties of emulsion drilling muds based on technical rapeseed oil with oil/water ratio 65/35 were investigated. The resulting solutions were compared with solutions based on synthetic oils produced according to the same formulation. The influence of various emulsifiers on the properties of emulsion drilling muds was analyzed. The article studies filtration, antifriction and inhibiting properties of the resulting solutions, as well as their colloid stability and effective viscosity.

It is shown that cryoprocesses play an important role in the pollution of watercourses during ice formation. The content of heavy metals was determined layer by layer in ice cores. The growth rate of ice crystals, determined by the temperature regime, has been established. The mechanisms of concentration of chemical compounds in supercooled water at the contact with the lower surface of the ice mass and their crystallization are considered. It is revealed that the phase transition of water from a liquid to a solid state and the growth of ice crystals contribute to the supersaturation of water with chemical compounds between ice crystals. The conditions under which the concentrations of crystallizing chemical compounds exceed their average content in under-ice water and play an important role in channel pollution during floods are described.

The monthly average concentrations of suspended solids for the period 2017–2019 from the averaged raw data of the federal and regional monitoring networks were presented and compared with the established average annual standards. Maps of the spatial distribution of suspended solids concentrations in December 2019 were provided with the location of recording stations. Spatial dynamics of suspended PM1 and PM10 concentrations in urban areas were demonstrated. The necessity of further research and revealing of existing sanitary and hygienic standards violations was substantiated.

A retrospective analysis of the risk assessment methodology is carried out. The most authoritative sources and the established paradigm of risk assessment are considered. Some alternatives in the interpretation of risk assessment are shown. The importance of the correct interpretation of the risk assessment and the choice of the way to achieve it is noted.