The possibility of using the energy values of landfill gas to generate electrical and thermal energy based on a contact cogeneration gas turbine installation has been studied. The optimal values degree of increase pressure in the cycle are determined, which make it possible to determine the maximum specific electrical power and thermodynamic efficiency of a cogeneration gas turbine installation with steam injection, in which landfill gas from solid waste landfills is used as an energy carrier. It is concluded that using the proposed engineering solution, landfill gas from municipal solid waste can be usefully implemented in a cogeneration contact gas turbine installation, which will save the country's national wealth and at the same time solve pressing problems of modern cities associated with the disposal of municipal solid waste.

The potential for use of mill scale (metallurgical production waste) as an affordable sorption-filtration material for aqueous medium protection from phosphates and heavy metals is considered. The results of X-ray phase studies of mill scale prototypes, as well as extraction of dissolved components from them into bidistilled water at long-term contact, which revealed insignificant emission of harmful substances indicating safety of the mill scale application as a sorbent, are given. It is proposed to use industrial cartridges (filter cartridges) loaded from rolled scale to purify large volumes of surface wastewater in real conditions.

A combined scheme for wastewater treatment is proposed using a combined filter, which includes a reagent treatment section, a mixing chamber, a contact flocculation chamber and a sand-loaded filter. The main features of the operation of the mixing chamber located inside the filter housing are considered, which ensures the intensification of the coagulation process, due to the continuity of the coagulating and filtering process in a single housing without interrupting the process, due to which the flakes are not destroyed when moving from stage to stage. To confirm the efficiency of the mixing chamber, a number of laboratory experiments were carried out on model and river water. It has been confirmed that the use of the developed mixing chamber improves the filtration process by 15 to 30%. It was concluded that intensification of the filtration process would improve the efficiency of treatment facilities as a whole and ensure the quality of water for discharge into water bodies.

Processing of data obtained using lidar technologies was carried out to identify the vertical variability of the distribution of aerosols in the atmospheric column by month. The results of 227 lidar measurements from 2014 to 2023 were processed in total. It has been established that the concentration and height of compacted aerosol layers begin to increase in spring time, reaches a maximum in July, and from October there is a visible decline in aerosol concentrations in the atmospheric air. It has been established that in the warm season the height of compacted aerosol layers reaches 1200–1800 m, while in the cold season it reaches only heights of 600–1100 m. It was concluded that fine aerosol predominates over the city, based on the calculated Angstrom parameter in the range from 1.95 to 2.91.

The issue of increasing the physical and mechanical properties of composites by modifying the wood is considered. To improve the quality and increase the resistance of wood filler to various influences, the acetylation has been proposed, which is carried out aiming to introduce the acetyl groups into the composition of wood by replacing free hydroxyl radicals. The effectiveness of acetylation as a method of modifying wood filler in the production of composite materials in order to improve their physical and mechanical properties (dimensional stability, hydrophobicity and biostability) has been experimentally confirmed.

A parametric method for detecting gas leaks on main pipelines is proposed. A pipeline model with a leak characterized by coordinate and diameter is constructed, and the simulation results are transferred to a program that calculates the coordinates using the presented method. A conclusion is made on the applicability of this method at gas transportation system facilities.

The possibilities of reducing the negative impact of chrome tanning agents on the environment are considered. Special attention is paid to the chrome-saving technology of dressing fur raw materials with pretreatment with non-toxic non-isocyanate urethanes. The results of a study on reducing the concentration of chromium in the working solution using functional non-isocyanate urethanes are presented. The object of the study is the raw material of fur sheepskin. It was revealed that the introduction of pretreatment with non-isocyanate urethanes before chrome tanning of fur raw materials allows reducing the initial concentration of chrome tanning agent in the bath to an average of 37%.

An approach is presented to assessing the area of territory where the environment is subject to negative impacts due to the location of a facility of Accumulated Negative Impact on Environment (ANIE) using geostatistical methods (methods of the kriging "family"). The results of calculating the area of the ANIE facility on the adjacent territory using the developed algorithm using the Python software product are presented. Based on the results of the analysis of the negative impact of 20 ANIE facilities, it was concluded that the area of influence of the ANIE facility on the adjacent territory exceeds the area of the ANIE facilty by an average of 16.5 times.

A study of the Shakhtaminskoe tailings dump of the molybdenum deposit (village of Vershino-Shakhtaminsky, Trans-Baikal Territory) was carried out using the electrical tomography method with verification by geochemical testing. It has been shown that waste corresponds to a medium with a resistance of 1–300 Ohm·m. The location of the fault zone at the base of the storage facility has been clarified. The body of the technogenic system has been contoured, the resources of valuable and toxic elements are calculated.

It has been found that areas of differentiated and undifferentiated technosoils with plant species diversity (from 21 to 26) are characterized by intense processes of vegetation restoration occurring in them. A gradual increase in the proportion of native species relative to ruderal species, as well as a gradual increase in species diversity, was noted. It was concluded that the ongoing processes of restoration of vegetation cover at the studied sites indicate the effectiveness of the reclamation work carried out using coal benefication waste.

It has been established that there is a constant increase in the accumulation of waste within the borders of the RF, in which the main share consists of waste from mining. The correlation between the annual mass of waste generated from technogenic mineral formations (TMF) and the volume of mineral extraction and the specific share of the open-pit mining method has been determined. The distribution of accumulated waste across the Federal Districts has been identified and the situation with their use has been characterized. It was noted that in the Federal Districts with the largest volume of accumulated waste, the percent of their involvement in secondary circulation for the period 2019–2022 decreases (relative decrease percent 41.2–7.2%). A conclusion is made about the unsatisfactory state of affairs in the field of application of SWM, which requires the number of measures to solve problems that complicate the introduction of man-made deposits into economic circulation.

An attempt has been made to assess the effectiveness of remediation of the tailing’s storage facility of a mining enterprise for the performance of ecosystem functions by a formed soil-like body in comparison with the background soil for this territory. To assess the biological properties of the soil-like body, the following were analyzed: the total number of bacteria, the abundance of bacteria of the genus Azotobacter, the activity of soil catalases and dehydrogenases, germination, and length of radish roots. An integral indicator of the state of the soil-like body was calculated for a comprehensive assessment of the effectiveness of tailings pond reclamation. It was found that the soil-like body of the reclaimed tailings dump performs its ecosystem functions as fully as the background mountain meadow chernozem soil for this territory. It is concluded that the reclamation works were carried out effectively with the restoration of the ecosystem.