The results of the development and experience of the implementation of flotocombines for wastewater treatment are considered. The principle of flotocombine operation and peculiarities of its use are described. Technological schemes of waste water treatment with the use of flotocombines, as well as data of their industrial tests in processes of waste water treatment of various industries are presented. The higher efficiency of wastewater treatment using flotocombines has been experimentally proven.

The results of experimental studies of the local subsurface irrigation method in comparison with drip irrigation carried out in the laboratory, which showed water savings due to a decrease in evaporation from the soil surface by 10–15 percent are presented. The method of irrigation in closed greenhouse farms using water with a high salt content is described. The paper proposes new patented schematic solutions for protecting plants from frost and pests, describes a multifunctional engineering and reclamation system capable of performing various operations depending on the emerging problems during the growing season.

Local industrial waste from the Samara region (aluminochrome waste of petrochemicals, aluminium sludge of non-ferrous metallurgy) has been studied for use in the production of fire-resistant lining materials with enhanced operational characteristics. The composition and properties of industrial wastes formed at the Samara Metallurgical Plant and their application for obtaining active liquid-steel binder compositions have been studied. The dependence of these compositions refractoriness on the type of hardener and the amount of additive has been analyzed.

The development of a comprehensive technology for the processing of ash waste (ASW), which is based on the extraction of carbon from the CSO by flotation method and iron-containing minerals by means of magnetic separation, is presented. The proposed approach is based on the extraction of carbon from ash and slag by flotation and iron-containing minerals by magnetic separation. In this work, the optimal size of the ash fraction supplied for flotation was established. It is shown that when the technological process is carried out according to the stadium scheme when flotation reagents are fed in fractions, it allows their consumption to be reduced and the recovery of carbon concentrate from underburning to be significantly increased. The developed technology was tested on a pilot plant. High-quality carbon, iron-containing and aluminosilicate products were obtained. Auxiliary enrichment processes such as classification, thickening and filtration were tested.

The possibility of using sorbents from FOPS® filters, spent in the processes of purification of surface wastewater, is shown to intensify the growth of radish plants of the “French breakfast” variety. The ability of these waste sorbents, introduced into soil-ground substrates (SGS) as structure-forming additives enriched with microelements, was found to significantly stimulate the development of the root system with some slight inhibition of shoot growth. In the course of the experiments, the optimal value of the addition of sorbents spent in the processes of cleaning surface runoff (from roads) to the SGS was determined, which provides the greatest increase in the biomass of the root system of plants used as a test culture. It has been established that the accumulation of heavy metals (HMs) in the leaves and roots of a plant test culture increases with an increase in their content in the spent sorbents, but the actual concentrations of HMs in plants do not exceed the standards for their content in robust feed for animal husbandry. An assessment was made of the use of sorbents spent in water purification processes to create soil used in the reclamation of landfills for the placement of solid municipal waste, industrial dumps, road slopes, as well as in the restoration of forest resources and soil remediation.

A method for producing ceramic earthquake-resistant bricks based on beidellite clay used as a binder and slag from the smelting of ferrotitane used as an aluminum-containing thinning agent is considered. The resulting brick corresponded to the M150 brand, from which it is possible to build buildings of more than 10 floors.

The properties of sorbent on the basis of thermoexplite (STRG) obtained from the engineering center of IngSU "Development of modified sorbation materials" have been investigated. This sorbent is proposed to be used in the elimination of oil spills and products of its processing from the water surface. The porosity of the STGR was analyzed using a mercury porosimeter Pascal 140 and 240 Evo. It is shown that the investigated sample is a volumetric porous tool with a specific pore volume of 35.5 cm³/g. It is found that the available porosity is more than 97.2%. The pore size distribution was studied. Based on the data of the porous system, research on the sorption of oil and oil products by this sorbent. Shown is the high efficiency of STRG in cleaning the water mirror from oil and oil products. The main properties of oil sorbents have been investigated.

The results of the study of the levels of atmospheric air pollution by solid particles with different approaches to the accounting of dust and the analysis of the sufficiency and validity of permissible emission standards are presented. On the example of an operating enterprise, taking into account the current inventory, a comparative analysis of the levels of exposure to solid chemicals and the sum of all dusts (TSP) was performed. It is established that the dust factor at the total emission, forms the values of the maximum concentrations 2 times more than the individual chemical components. The presented results confirm the need to review the existing approaches to the regulation of emissions of solid components, including the inclusion in the system of the assessment of the sufficiency of emissions by the criterion of the total impact of dust in general. A correctly estimated level of total dust exposure will allow to exclude an unacceptable level of exposure to solid industrial emissions at the initial stage of the formation of project and environmental documentation (NDV projects).

The enzymatic activity (catalase, cellulase) of soils and technogenic sand on the territory of the former Dzhida tungsten-molybdenum combine (Western Transbaikalia) was studied. The objects of the study were the surface 0-10 cm layers of alluvial dark humus soil (Fluvisols) as a background, man-made sand (waste after mining and processing of tungsten and molybdenum ores) and soils of recultivated contours № 1, 3, 4. At the same depth, linen cloths were laid to assess the activity of cellulase. Differences in the activity of soil enzymes of the background soil and soils on the studied contours were established, depending on the level of heavy metals content in them and the technologies used for reclamation.

The results of agroecological monitoring of arable and fallow lands are considered. It has been established that the content of humus and mobile phosphorus in the soils of the fallow, as well as the value of the salt pH, is lower than on arable land; mobile potassium is higher. This may be due to the migration of deposited potassium from the lower soil horizons into the humus horizon and its release from the absorbed state during the decomposition of organic matter. It was revealed that in fallow soils, the content of mobile phosphorus in the range of 150–600 mg/kg directly correlates with the value of salt pH (4–6 pH units), while this dependence is not observed on arable land.

The state of the waste management system in St. Petersburg and Finland over the past 25 years is considered. It is shown that over the years, the system of municipal solid waste (MSW) management in St. Petersburg has not fundamentally changed. The bulk of waste - 88% is taken to landfills, and 12% is processed into compost. In Finland, over the years, the MSW management system has changed significantly: the amount of waste disposed of at the landfill has decreased by 46 times, the amount of waste incinerated at incinerators has increased by 7 times; the amount of waste selected for secondary raw materials increased by 1.5 times. An assessment of environmental damage to municipal solid waste management systems showed that over the past 25 years, specific environmental damage for St. Petersburg increased 2.22 times, and for Finland decreased 18.07 times.

This review is devoted to the analysis of the impact of electromagnetic radiation on biological objects, primarily on humans. The work of domestic and foreign scientists on the study of the dangers of electromagnetic radiation to humans, especially the work of American scientists and the data of official reports of the US government.