The possible use of organic consumption residual as a secondary energy resource by a process recovery boiler and further application of generated ash for heavy-metal deionization of wastewater at industrial enterprises was demonstrated. Elemental constituents and technological characteristics of organic biomass, boiler parameters and generated ash toxicity were determined. The adsorption isotherm of copper cations under static conditions and F absorption diagram under dynamic conditions of standardized test solutions by organic waste of consumption residual were simulated. The treatment flowchart of galvanic wastewater was presented. The post-treatment adsorber for heavy-metal deionization of wastewater was proposed.

The features of the application of the electrochemical method in oil-contaminated areas with different reliefs to ensure highly efficient cleaning at different degrees of pollution are considered. It is noted that for different soil, the amount of passed electric charge will depend on the concentration of the pollutant. Various options for the location of the electrodes, their design dimensions and shape are considered.

Nature and consumption of foam-blowing agents and different collectors effects on carbon capture from ash were studied. The dependance of the foam-blowing agents consumption and the of flotation efficiency index was traced. The SAS-2 modifying agent impact on chemicals consumption was demonstrated. It was found that the floatability of a number of collectors among investigated petroleum products, in the case of preliminary application of the SAS-2 modifying agent, is determined by its molecular composition and declined as follows: kerosene>(mixture: vacuum gas oil + kerosene)> motor alkylate> heavy polymer-distillate. It was demonstrated that the use of required modifying agent at feeding before collector application improves the flotation efficiency and reduces the collector consumption.

The possible use of spent grain, main waste product of breweries, for purifying waste water from oil was considered. Modified sulphuric and nitric acids at various temperatures increase the sorption properties of spent grain with regard to oil. Increased acids' concentration and temperature during the treatment by spent grain help to reduce the residual concentration of oil in standardized test solutions of wastewater treated by modified spent grain. It was found that the maximal removal of oil occurs while using the spent grain modified by 5% sulfuric acid at 121 °C and overpressure of 1 atm. The use of modified spent grain makes possible to improve the purification degree of oil-contaminated wastewater.

Main calculation issues of roadside protective shildings were described. On the basis of the developed visual diagnostics method of air flow structure, a special configuration of protective shildings (discrete shields) was proposed to take into account peculiarities of the movement structure of polluted air stream over the roadway platform.

The possibility of using smeared soil from oil extraction and shale clay in the production of ceramic lightweight bricks without the use of natural traditional raw materials is shown. The suitability of the smeared soil containing an increased amount of organic matter and calorific value as a burnout additive for the production of lightweight bricks is investigated. The expediency of using interstitial clay (waste of combustible shale) as a binder for ceramic materials has been established. The resulting lightweight ceramic bricks have high physical and mechanical properties.

The features of the phenol and 2,4-dichlorophenol-degrading strain S. marcescens MT9, isolated from the soil of the Ufa (Republic of Bashkortostan) a major producer of organic chemistry products in Russia, are described. Identification of the strain was performed according to the cultural, morphological, physiological, biochemical, morphometric features, as well as the results of the comparative analysis of the 16S rRNA gene sequence. The growth of S. marcescens MT9 in the batch culture with phenol and 2,4-dichlorophenol as sole source of carbon and energy in concentration 100 mg/l was studied. It was established that the phenol and 2,4-dichlorophenol content in the culture liquid was reduced to the 6th day by 82 % and to the 8ths day by 65 % from the control, respectively. The possibility of using S. marcescens MT9 for phenol and 2,4-dichlorophenol utilization in industrial wastewater of petrochemical production and production of tanning extracts has been revealed. The level of wastewater treatment using strain S. marcescens MT9 was 89,3–99,6 %.

A monitoring study of Hg distribution in soils and air (pedogenic and atmospheric) in residential settlements and surrounding areas with high natural geochemical Hg background and/or affected by man-caused impacts due to mining activities has been performed. Sites of the AltaiSayan mercury province have been studied: part of the Kurai mercury zone (Aktash settlement, Kurai campo, Chazan-Uzun settlement, Altai Republic) and part of the Ursk ore field (Ursk settlement and Ursk tailing dump, Kemerovo region). The third site is located in Kuznetsk Alatau (part of the Saralinsky gold ore cluster, settlement of Priiskovy and its tailing dump, the settlement of Ordzhonikidzevsky, Republic of Khakassia). Hg background concentrations in air and soils have been detected.

Problems of ecosystem pollution with phosphogypsum, by-product (waste) in mineral fertilizers production in chemical industry have been considered. Examples of the waste-free technology use for processing of phosphogypsum and the extraction of components that are strategically important for the country’s economy, including rare earth metals and gypsum stone have been given. The basis of the State environmental policy in the field of recycling and disposal of industrial waste has been studied. Foreign experience has been analyzed. Legal and organizational mechanisms have been proposed for improving the development of the mineral fertilizer industry.

Amur pollution is considered as a function of the content of soluble and suspended forms of chemical compounds in river water. It was revealed that low-mobile chemical elements (Fe, Al, Cd, Zn, Cu, Pb) migrate both in the composition of large organic colloids (0.45–1.0 μm) and in the composition of soluble complex salts. Their concentrations in the river bed are controlled by industrial, urban and agricultural wastewater. The processes of redistribution of elements between their colloidal and soluble forms are determined by the activity of channel processes, the composition of bog waters, and flow turbulence. High floods 2019–2021 in the absence of man-made accidents, they contributed to a gradual decrease in the concentration of pollutants and stabilization of water quality in the Amur.

The reasons of produced waters appearance in the oil and gas complex, all the kinds of these waste and the possibilities of their identification using observation from space are considered.