The features of maintaining large-capacity waste from oil and gas fields that are suitable for recycling into secondary products are considered. A step-by-step system for selecting and justifying a waste is proposed taking into account the development of the deposit, its natural and manmade features, as well as the selected stages of operation. Pieces of technological schemes of waste preparation are given, as well as the design of the waste preparation complex for disposal constructed at one of the largest oil fields of the Samara region.

The possibilities of utilization of technogenic products of aluminum production: coal foam and carbon concentrate (СС) are considered. It is proposed to utilize CC in order to extract valuable components. The regularities of the utilization process of CC by the combustion method have been studied. It was found that the content of germanium in ash is determined by the temperature and the oxygen partial pressure in the system. Gallium is concentrated in ash in an amount of 0.8 wt.% during the combustion in a fluidized bed at a temperature of 1200 °C, the germanium extraction into sublimates reaches 90 %. The results of the leaching of gallium from the ash residue in acidic and basic media are presented; the maximum gallium extraction was 90 and 94 %, respectively.

The processing of liquid and solid waste from the food industry using microalgae is considered on the example of St. Petersburg enterprises. Waste water from Baltika Brewing Campaign and food waste from public catering enterprises were used in the work, using the example of food waste from the canteens of Peter the Great St. Petersburg Polytechnic University. Тhe possibility of purifying wastewater from the brewing industry using microalgae was studied. The obtained biomass of microalgae after purification of waste water from the food industry is proposed to be used to accelerate the processes of anaerobic digestion of food waste generated in the canteens of the Peter the Great St. Petersburg Polytechnic University. It has been shown that the addition of microalgae biomass is capable of accelerating the decomposition of food waste and producing more biogas with a maximum methane content.

Outcomes of experimental, analytical, statistical research on aquatic mediums in various conditions of the Maata river’s diffuse sources, village Berdigestyakh (Yakutia), by using the electrochemical coagulation method, substantiation of optimal parametrization of water purification have been presented. The study’s results of using a non-routine electrochemical conditioning method to produce the high-quality drinking water without chemicals from the surface water of the river Maata to comply with the drinking water treatment requirements have been elaborated. The test approval of soluble electrodes has been carried out with the St3 steel to assess their efficiency while applying the electrochemical treatment of low-mineralized high and duckweed covered northern water systems. The modes for water electrochemical conditioning have been identified and substantiated, structural elements and parameters of the core assembly unit have been developed for implementing the electrocoagulation method under the village Berdigestyakh conditions, as well as schematic diagrams of their arrangement into separate modules of various capacities.

The assessment of the degree of degradation of the soil and vegetation cover in the territory of storage of snow masses was carried out. It is established that in the soils of the polygons there is a decrease in the reserves of organic carbon, an increase in the power of the abiotic alluvial layer, a reduction in the power of the upper part of the soil profile, washouts and algae are formed. It is determined that the soil filtration coefficients are low. Stagnation of water near the surface and prolonged waterlogging against the background of low temperatures during the entire period of snowmelt were revealed. The soils of all snow polygons are characterized as highly degraded. They have lost their valuable functions for humans and need to be reclaimed.

The possibility of utilization of inactive fly ash in road concrete compositions by bringing of ash into a non-equilibrium condition with increased reactivity by mechanical activation in a vibration eraser is investigated. It was revealed that the optimal content of binder and fly ash in samples of soil concrete was 8 and 10 wt. %, respectively. It is shown that, due to mechanical activation, the specific surface area of fly ash increases by 2 times, dehydration and carbonization occur and silicon is replaced by aluminum in silicon-oxygen tetrahedra. It has been established that an increase of the content of crystalline carbonate phases is the reason for an increase in the strength of ground concrete. It is determined that the introduction of mechanoactivated fly ash into the composition of soil concretes contributes to increasing their physical and mechanical characteristics to the maximum strength grade M100. This indicates the competitiveness of ground concrete and the possibility of direct use of inactive fly ash in road construction.

The optimized designed irrigation scheme and water distribution system to reduce the anthropogenic impact and remove the pollutants by 20–25 % have been presented. The optimal launch sequencing of the irrigation equipment has been introduced by using the study irrigation area under conditions of water resources scarcity to determine the launch sequences regardless the crop rotation used. The presented model allows to bring down the irrigation water consumption by 30 % while decreasing the working cycle of the irrigation material, specifically by reducing the number of land irrigations without any impact on the yield.

Based on the remote sensing data, the aggregated information has been provided on rock disposal dumps of the surface and abandoned coal deposits in the mining regions of Siberia and the Far East. High-resolution satellite images have helped to square the acreage of slope grade horizontal alignments of rock disposal dumps, as well as the yielding capacity of plant ecosystems on the dump slopes. The rock dumps architecture has been proposed to ensure the ecological balance generation at the appropriate pace. The economic indicators of the remedial ecology package work at the rock dumps have been provided.

Modern methods of improving the characteristics of ceramic products by introducing modifying additives based on various industrial wastes into the composition of the ceramic mass are considered. The compositions of ceramic masses and some features of the technology of manufacturing ceramic products using industrial waste are described. A diagram for the distribution of wastes from various industries (modifiers of the ceramic mass) according to the main type of action and predominant oxides is proposed.

Environmentally safe concentrations of oil in the soils of wet and dry subtropics of the Black Sea coast of the Caucasus (Black Sea Coast) have been established according to the degree of violation of their ecological functions. The indicators of the number of bacteria, the activity of soil enzymes, plant growth and development were determined. Based on the analysis of the degree of disruption of the ecological functions of soils, regional values of the maximum permissible concentrations of oil in the soils of the Black Sea Coast have been established.

The development features of the renewable energy industry in solar and wind generation sectors, both characterized by their high manufacturability and equipment and components export potential and their extremely low production scale have been presented. The issues in relation to the solar and wind resources efficiency, cost reduction of solar and wind generation, electricity production technologies by increased application of the international practices have been studied.