The results of studies on the disposal of lignin waste generated at pulp and paper industry enterprises during the production of rubber and technical products are presented. Data on the volume of lignin waste generation at the country's largest pulp and paper mills are assessed. Using the example of Arkhangelsk Pulp and Paper Mill JSC in Novodvinsk, a potential damage caused assessment was performed from the disposal of lignin waste. The negative consequences of lignin waste disposal and incineration are identified. Given the ability of lignin to react chemically with rubber crumb components, the article justifies the development of technology and production processes for the utilization of lignin in the production of rubber products with lignin filler, which can be used in the construction of sports facilities, outdoor areas, and transportation systems. It is concluded that the proposed approach represents an environmental alternative to the use of technical carbon in the rubber industry. The prospects for the utilization of lignin waste using this method are substantiated, and the need for such products in the country is assessed.

The research of expanded clay production based on intershale clay and coal beneficiation waste without the use of natural traditional materials are presented. The use of an optimal amount of coal beneficiation waste (35%) in ceramic compositions makes it possible to obtain expanded clay at a firing temperature of 1100 °C of grades from M300 to M450, depending on the content of carbon and organic matter in the waste and increased calorific value. It was established that the expanded clay grade mainly depends on four indicators of coal beneficiation waste: LOI (loss on ignition), carbon (C), calorific value and organic matter.

The results of developing pyro-hydrometallurgical schemes for the recovery of vanadium and manganese from titanomagnetite concentrate obtained from apatite flotation tailings of JSC “Apatit” are presented. For vanadium extraction, a high-temperature oxidizing roasting followed by carbonate leaching and concentration with ion exchange sorption or solvent extraction methods is proposed. In order to isolate manganese recovery, roasting under reducing conditions, sulphuric acid leaching, iron removing by solvent extraction and carbonate precipitation were used to obtain a marketable product in the form of manganese oxide are used.

The regularities of electrochemical formation of ferrous and ferric hydroxide hydrates, their properties, and the efficiency of their application in the process of electrocoagulation for the treatment of wastewater containing persistent organic pollutants (POPs) were investigated. The results of studying the formation domains of ferrous and ferric hydroxide hydrates as a function of pH are presented. The influence of the following factors on the electrochemical generation of iron ions was established: specific electrical resistance of water, the presence of POPs in water in the form of anionic and nonionic surfactants. Recommended values of process parameters of electrochemical coagulation are determined-specific yield of iron ions, anodic current density, and degree of POP removal-with reference to wastewater from dyeing and finishing enterprises of the light industry.

Numerical simulation using the computational fluid dynamics (CFD) method was performed in the FlowVision 3.13 software package to analyze the influence of hopper geometry on the efficiency of fine dust capture in a cyclone separator. Four hopper configurations were investigated: square, cylindrical, square with a side outlet and pipe-type hopper. It is shown that the configuration of the dust hopper affects the formation of reverse gas flows causing secondary entrainment of already deposited particles. It is concluded that targeted optimization of the dust hopper design is a cost-effective and technologically feasible method for improving the efficiency of cyclone separators.

The assessment of the degree of chemical contamination of soils in the area of unauthorized municipal solid waste landfills in the Siberian Federal Distric has been carried out. It was found that the degree of chemical contamination of soils in the area of the majority of analyzed unauthorized landfills is insignificant (the soil contamination category is "clean" and "acceptable"). It has been revealed that the predominant pollutants present in the soils near unauthorized municipal solid waste landfills, are lead, zinc, and nickel, both in terms of frequency of occurrence and the magnitude of excess of background levels.

The problems of analysis of technogenic ecosystems of Siberia formed as a result of mining activities are presented. Issues of assessing the resource potential of stored waste as an important source for secondary extraction of valuable components are highlighted. The environmental risks associated with Siberia's harsh, continental climate, which exacerbates the degradation of technogenic structures, slows down remediation, and increases the risk of accidents, are examined. The methodological complexity of exploration and accounting of technogenic deposits is emphasized. As a key tool for solving monitoring tasks and assessing risks and resource potential, the approaches of environmental geophysics and integration of geophysical and geochemical methods, which have proven effective in Siberian conditions, are considered.

Proposals have been developed for identifying and reducing heat load in the urban environment based on sustainable urban planning adapted to climate change conditions. This research is relevant due to the increasing frequency and intensity of thermal anomalies in cities and the resulting deterioration in quality of life due to the insufficient integration of adaptive approaches into modern urban planning. The climatic characteristics of St. Petersburg, as well as the characteristics and consequences of the urban heat island effect (UHI), are examined. Key methods and tools for studying UHI are analyzed, including satellite data processing in the Google Earth Engine cloud platform and spatial analysis in QGIS. A mathematical model has been developed and automated.

The efficiency of the regulating functions of bogs and forests of the middle taiga of Western Siberia is compared. Indicators of CO₂ absorption in bog and forest ecosystems of different regions (Canada, Tomsk Region, Khanty-Mansi Autonomous Okrug–Yugra) and long-term monitoring data from the "Mukhrino" station are analyzed. A summary table of CO₂ absorption coefficients (t/ha•year) for the compared ecosystems is compiled. It is shown that, recalculated per hectare, bogs and forests annually absorb comparable volumes of CO₂. Conclusions are formulated on the necessity of bog conservation and sustainable forest management as elements of nature-based climate solutions.

A general characteristic of the industrial potential and a retrospective analysis of the state of natural and technogenic safety of the Kemerovo Region (Kuzbass), with emphasis on the problems of the coal mining industry, are presented. Methodological features of risk assessment (individual, integrated, carcinogenic, non-carcinogenic, territorial) are considered. For the municipalities of the region, the levels of technosphere, sociosphere, and natural emergency risks were calculated, the results of which are presented in the form of territorial risk maps. The necessity of expanded application of information technologies and systems for monitoring, risk analysis, and safety management in combination with the development of program measures for risk minimization is noted.