Technological approaches to the integrated use of waste generated during the incineration of municipal solid waste (MSW) to produce products suitable for use in traditionally waste-intensive industries are considered . The current directions in world practice for the disposal of ash and slag from waste incineration plants and the main prospects for the process of carbon dioxide sequestration using ash and slag waste are covered. An analysis of the limiting factors for the disposal of ashes and slag in the production of building materials, agriculture and geotechnologies is presented. The dispersed and material composition of slags and ashes from the combustion of MSW has been studied, and the morphostructural features of slag silicate grains have been established. The results of tests of pneumatic separation of slag in a cascade-gravity classifier with the production of sand for construction geotechnical work at landfills are presented. The possibility of using waste from a waste incineration plant for the production of compacts of technogenic powdered materials and products of their processing has been shown in order to create materials with specified technological properties and reduce the toxicity of waste

The process of bioremediation of anthropogenic water bodies based on the technology of transformation of anthropogenic water bodies into nature-like wetland ecosystems is studied. The results of laboratory studies of accumulation of various pollutants, in particular heavy metals and mineral nitrogen compounds, by local moss communities in phytomodules on waste water settling ponds of the enterprise "Karelsky Okatysh" JSC are presented. The degree of efficiency of higher aquatic plants in industrial wastewater treatment is evaluated. It is concluded that the results obtained can be used for further development of phyto-purification systems in Russia.

The possibility of using titanium sludge, which is a finely-dispersed waste with high content of titanium dioxide TiO₂ and calcium fluoride CaF₂ in the construction industry as an agent replacing cement binder and improving the properties of concrete composition, is considered. The properties of modified concretes with different percentage of binder replacement were studied, the characteristics of strength, porosity and water absorption were determined according to standardized methods, and the composition showing the best characteristics was revealed. The mechanism of the effect of the main waste compounds on concrete is described.

The synthesis of carbon-mineral adsorbents was carried out in order to purify water from organic compounds using rice husk (RH) and its pyrolysis product (PRH) Adsorbents with a microporous structure were obtained by steam-gas activation of the PRH. Based on natural montmorillonite clay and hydrophobizers (RH and PRH), samples with a mesoporous structure were obtained by pyrolysis of a molded mixture of clay and a hydrophobizer. For the synthesized adsorbents, the isotherms of adsorption of water vapor at 20 °C and the isotherms of adsorption of nonionic surfactant neonol AF 9-10 from aqueous solutions at 20 °C in the concentration range of 0–80 mg/l were determined. It is shown that these adsorbents had an adsorption capacity of neonol AF 9-10 slightly inferior to the best industrial activated carbons. It is concluded that carbon-mineral adsorbents synthesized using RH and PRH can be recommended for adsorption treatment of wastewater from dissolved organic substances.

The possibility of obtaining low pour point diesel fuel by dewaxing of feedstock containing hydrotreated thermolysis oil obtained from a mixture of plastic wastes is presented. It has been established that in the process of dewaxing the n-alkanes of the feedstock, regardless of the length of the carbon chain, undergo almost complete conversion, leading to the improved low-temperature and rheological properties of the hydrotreated product. It is concluded that the obtained petroleum products are characterized by a high degree of environmental purity, since they do not contain chlorine, and the concentration of sulfur- and nitrogen-containing compounds, as well as polycyclic aromatic hydrocarbons, is minimal.

The problem of environmental pollution by wastewater from the urban sector is considered. The composition of these waters and their impact on aquatic ecosystems depending on the content of soluble phosphates and polyphosphates are analyzed. A photometric analysis was performed to quantify the level of soluble phosphates. The results of hydrochemical analysis of wastewater for the content of soluble phosphorus compounds are presented. Increased concentration of phosphorus compounds entering the environment with wastewater and contributing to its pollution, especially in the absence of a sewerage system, was revealed. It is concluded that it is necessary to control the phosphate content in domestic wastewater.

In the software package Aspen Hysys (version 12) with the help of Aspen Process Economic Analyzer, a technical and economic comparison of the possibilities of two different variants for phenol-containing aqueous water waste treatment at "Kazanorgsintez" PJSC using the extraction process and as a result of oxidation of organic components of the water runoff was carried out. Modeling and scaling of these processes for a runoff fed at a mass flow rate of 1000 kg/h was performed An estimation of operating costs for realization of each of the investigated variants is given.

The most common hazardous geological processes affecting the right-of-way of the trans-Sakhalin pipeline system (within the Sakhalin-2 Project), primarily in the Makarovsky District, are considered, and the prerequisites for their development are listed. A database of these processes was created and the results of visual inspection of the pipeline route for oil spills were described. The adequacy of monitoring and reclamation activities along the study area was analyzed. It is found that sections of the trans-Sakhalin pipeline system exposed to hazardous geologic processes were considered during design and construction of the facility and are subject to monitoring and regular maintenance. A conclusion is made about the exposure of the pipeline system to geo-ecological risks, and a forecast of the technical condition of the study object with necessary recommendations is given.

The experience of using artificial intelligence (AI) to create a predictive model of atmospheric air pollutant distribution in an urbanized area is presented. Various machine learning algorithms, their advantages and disadvantages in the context of air quality prediction are considered. The possibilities of using historical data accumulated from 2021 to June 2024 on atmospheric air pollution in Togliatti, meteorological conditions, topography and other factors affecting the distribution of pollutants for training of AI models are investigated. Simulation results demonstrating the effectiveness of the developed model in predicting pollution levels at different time scales are presented. A conclusion is made about the significance of using AI in the field of air quality monitoring, and practical recommendations for using the obtained results to optimize pollution management strategies and ensure environmental safety are proposed.

The problem of groundwater pollution by benz(a)pyrene and other polycyclic aromatic hydrocarbons (PAHs), the sources of which may be accumulators of industrial wastes from coke-chemical and oil-refining enterprises, is considered. It is shown that as a result of microbial degradation of benz(a)pyrene in soil and groundwater, the formation of carcinogenic substances with good solubility and low ability to sorption on soil particles is possible, which contributes to their rapid accumulation and migration in groundwater. With the help of mathematical modeling and developed software, the distribution of benz(a)pyrene and its degradation products in groundwater from the coal tar waste storage pond located in Ulan-Ude was assessed. Marker substances for monitoring the environmental situation around industrial waste disposal facilities containing benz(a)pyrene and other PAHs are proposed.

The spatial variability of the content of heavy metals in bottom sediments of the right tributaries of the river Ural is presented. Leading metals were identified in the geochemical associations of sediments of watercourses in areas of intense technogenic impact, associated with the specifics of existing industries. Data are presented for calculating the coefficient of average accumulation and the total indicator of soil pollution, which allows one to assess the level of pollution and the degree of sanitary and toxicological hazard of the rivers under study.