The article considers the concentration dependence of dust particles PM2.5 and PM10 on a curb stone on a number of influencing parameters. According to the data of field measurements, a quadratic regression equation was compiled, according to which the factors that have the greatest influence on the spread of fine dust near the roadway were determined. The results of mathematical processing of experimental data are presented in the form of a graph of the confidence area of the observed and predicted values constructed using the STATISTICA software product.

Keywords: PM10, PM2.5, fine dust, roadway, linear city, concentration dependence

The article shows the results of the dispersion analysis of natural dust in the steppe zone of the Volgograd region, obtained using a microscopic method. The integral functions and distribution of small particles in the selected samples after the application of the "dissection" method for particles up to 20 µm are presented.

Keywords: particle, dust, sample, dust of natural origin, dispersed composition, PM2.5, PM10, PM20

The results of studies of wet gas purification in a countercurrent scrubber for the purification of hydrogen sulfide-containing combined-cycle waste from oil and gas industry enterprises, and wastewater treatment and transportation systems are presented. A technical and economic comparison of various technologies for the purification of hydrogen sulfide-containing gas mixtures is presented

Keywords: steam-gas waste, hydrogen sulfide, hydrogen sulfide-containing gas mixtures, gas purification, electrochemical oxidation, electrolysis

The paper presents the results of evaluating the effectiveness of water softening using sodium-cationite filters with countercurrent modes of operation according to the flow schemes of purified water relative to the direction of supply of regeneration solution and washing water. The research was carried out at a pilot ion exchange facility using a single-stage sodium-cation scheme in laminar operation. It has been found that the flow from bottom to top under the resin layer leads to its compaction due to high hydraulic resistance, which in the case of water supply leads to an increase in softening efficiency, and the flow from top to bottom facilitates its passage through the resin layer due to low hydraulic resistance, which in the case of water supply increases the resin resource, and in the case of the supply of regeneration solution and washing water contributes to a more complete regeneration and washing of the layer from the residual amount of NaCl solution. A comparative characteristic of three grades of resins was carried out during two filter cycles with different countercurrent schemes. According to the results, the resins of the brands Purolite C100E and Tokem-150 are recommended for use in countercurrent circuits of filters for water softening.

Keywords: water purification, water softening, water hardness, hardness salts, ion exchange, sodium-cationite resins, resin regeneration, countercurrent regeneration, resin resource, resin regeneration degree

The article considers the directions and speeds of the air flow characteristic of the linear city of Volgograd. Weibull's law was tested for various wind speeds in various wind directions characteristic of Volgograd.

Keywords: climate, linear city, wind speed, wind direction, distribution law, distribution law, Weibull law, logarithmically normal law, impurity transport

The article deals with the distribution of fine dust in the atmospheric air of roadside areas of cities with a linear configuration, factors affecting its concentration in the roadside area.

Keywords: fine dust, roadside areas, road transport, wind speed, meteorological parameters

The paper proposes a method for automatic classification of roads based on the use of a convolutional neural network Mask-R-CNN. The developed technique makes it possible to automate the task of categorizing roads, which is fundamental in the redistribution of traffic flows, since knowledge of the category of the road allows you to determine its maximum capacity. The article contains a description of the stages of training a neural network, as well as the results obtained when using it. The method of automatic road classification proposed in the paper showed good results both in classifying roads based on satellite images and in classifying roads based on photographs of road sections. When expanding the test set, the number of classes of recognized roads can be increased to match the categories of roads according to SP 34.13330.2021. In addition, this technique (in terms of segmenting objects in photographs) can be used to control the quality of the roadway.

Keywords: road categories, convolutional neural networks, satellite imagery, image segmentation, Mask R-CNN, image recognition, computer vision

The article presents a modern technological solution in the field of preparation of hydrogen sulfide natural waters for domestic and drinking and technical purposes. The developed technology of iron-catalytic purification of natural hydrogen sulfide-containing waters in a reactor with an ultrafiltration separator is easy to operate, a small amount of peripheral equipment and a high speed of processes, and also has no by-products and is completely environmentally safe. The proposed technological parameters are experimentally obtained and confirmed using approved scientifically based methods of analysis, the use of metrologically certified instruments and equipment, a large amount of experimental data and their high convergence with calculated values. The presented solution can be recommended for use at water treatment facilities for the purposes of water supply to enterprises, small blue areas and individual households.

Keywords: purification of natural hydrogen sulfide waters, groundwater treatment technology, water treatment, hydrogen sulfide, catalytic iron oxidation, atmospheric oxygen, iron hydroxide, membrane separation, ultrafiltration, innovative technologies

The use of clayey soils in the construction of subgrade allows to reduce the use of sandy soils, thereby reducing the number of quarries formed. However, this requires the implementation of constructive measures aimed at ensuring reliability, strength and safety. One of the ways to implement such activities is the use of geosynthetic materials. In the article, based on the experience of designing and building objects with geosynthetic materials, the criteria for choosing their types depending on the tasks being solved are established. The necessity of developing a mathematical model substantiating the decisions taken is considered. The obligatory organization and conduct of geotechnical control is noted as a tool to determine the directions for the development of this area of ​​construction in order to reduce the technogenic load on the territories associated with the withdrawal of natural resources.

Keywords: subgrade embankment, transport engineering structure, geosynthetic material, embankment reinforcement, anti-erosion protection, geotechnical control

The article considers measures to ensure environmental safety. The analysis of the technological process of cement production was carried out, which revealed the main sources of dust emission. The results of the study of the dispersed composition of cement dust are presented.

Keywords: disperse composition of dust, PM10 and PM2.5, environmental safety, cement dust

During the construction, overhaul and reconstruction of highways, various transport and technical and hydraulic structures, timely and effective drainage of ground water through the use of high-quality drainage systems is of paramount importance. It is well known that the main cause of deformation and destruction of the roadbed is both surface and ground water. It is necessary to ensure good filtration capacity, high water permeability, strength characteristics and reliability of the drainage system, thereby increasing the bearing capacity of the roadbed throughout the life cycle of the structure used. The authors of this article decided to set up an experimental section of the drainage system in the summer, during the period when the UGV is the lowest. A trench with the lowest permissible slope of water intake pipes is arranged primarily, depending on their diameter, they should be in the range from 0.001 (at d = 500 mm) to 0.007 (at d = 150 mm) and a depth of 40 cm below the UPG. The width of the trench is 45-50 cm larger than the diameter of the pipe. The bottom of the trench is leveled and compacted. After the trench is installed, a leveling layer of sand with a filtering capacity of at least 5 m / day is laid into it. and a thickness depending on the type of soil (loamy 15 cm, clay at least 20 cm), which is covered with a geotextile cloth so that the edges come out of the ditch with a sufficient margin for subsequent closure of the structure. The horizontal tubular drainage system should include inspection, drop-in and receiving wells. At the bottom of the trench, already with the geotextile laid, crushed stone of a fraction of 10-20 mm is filled in, with a layer thickness of 30 – 40 cm. Then the laying of drainage pipes begins, from the drainage well, in compliance with the slope. The next step in the installation of drainage pipes will be filling them with a layer of crushed stone, about 20 cm thick, and its subsequent sealing. After that, the structure is wrapped with geotextile cloths located on the surface with minimal overlap on each other, securing the joints with a rope or thin wire to prevent disclosure. The remaining part of the trench is filled with local soil with its layer-by-layer compaction.

Keywords: pipe filter, drainage system, non-woven geotextile, drainage pipe, filtration, water permeability, surface density, life cycle of the structure, ring stiffness

Dust particles formed and propagated on the territory of industrial enterprises have certain physico-chemical properties. The traditional characteristic defining the properties of a dispersed (powder) system is its granulometric composition. Often, such properties of a dispersed material as (hygroscopicity, strength, porosity, abrasiveness, etc.) depend not only on the particle sizes in the dispersed material, but also on the shape of dust particles. Therefore, for a more complete analysis of the resulting emissions, it is necessary to know the shape of the solid particles contained in the gas-air mixture. To analyze the morphometric characteristics of solid particles, the transmission microscopy method was used, followed by the translation of the obtained raster photographs into binary format. The analysis of the obtained images was performed by Spotexplorer software. The data obtained after processing binary images were used to determine the morphological composition of solid particles.

Keywords: sphericity coefficient, cement plant, solid particle, microscopy, atmospheric air, emission, morphology.

The article discusses the importance of using energy-saving and energy-efficient technologies for the purpose of sustainable development of the country's territory. Examples of the introduction of energy-efficient residential complexes in Europe, as well as the experience of using these technologies in Russia are presented.

Keywords: energy efficiency, energy-saving technologies, construction, world experience, energy saving

The sedimentation analysis method is based on the measurement of the deposition rate of suspended solids depending on their equivalent diameter. The use of sedimentation for disperse systems is limited by their size, as microscopic dust particles have low deposition rates and are difficult to analyze. Therefore, for finely dispersed systems, the authors propose a method of sedimentation analysis using portable cameras that record the deposition process and break it down into frames. The images obtained frame by frame are translated with the help of a graphic editor into binary (black and white) format, which is able to process the software. The experimental data obtained are presented in the form of tables and distribution functions.

Keywords: sedimentation, dispersion, dust, binary photography, equivalent diameter, cement dust, distribution function

The article deals with the issue of the influence of ambient temperature on the initial height of the flare emissions rise. The paper presents full-scale and theoretical studies of flare emissions operating near a temporary residential complex. In the course of the work, a series of images of flare emissions at different ambient temperature conditions was carried out and their subsequent comparison with the theoretical model was carried out. Field studies verify the theoretical model and establish that the initial height of the flare emissions depends on the ambient temperature and has an inverse proportionality.

Keywords: Flare, flare emissions, atmospheric air pollution, PM2.5

The article touches upon the problem of waste disposal in the territory of the Russian Federation. The foreign experience of construction of utilitarian enterprises, existing technologies for waste recycling is given. Special attention is paid to the creation of an attractive architectural and artistic image of a modern industrial enterprise through the use of modern three-dimensional, constructive solutions in the implementation of architectural plans, ensuring the attractiveness of objects for the population by ensuring their multifunctionality.

Keywords: waste recycling plant, solid household waste, garbage, garbage disposal, waste recycling, spatial solutions, industrial building, utilitarian building, structural solutions, spatial structures, flat structures, facade systems, architectural image, environ

The geographical location, tectonic and geological-hydrogeological structure of the Maly Liman Lake basin, its landscape features as a natural monument of regional significance located on the area of the Abraus Peninsula of the Krasnodar Territory were described. The results of current bathymetry studies of the lake were shown. The hypothesis about tectonic origin of its hollow was justified. The sedimentations of the Maly Liman and Abrau lakes were tested and their description was fulfilled. By using radionuclide analysis the sedimentation rates were determined. Expedition work was carried out and a description of the outlets of the perched waters was made. The water balance development models of the of the Maly Liman Lake in the conditions of arid and relatively full-water period were constructed. The perched water dynamics of the upper reaches and surface run-off as the dominant supply sources of the lake was described. A hydrogeological section was constructed along the section of Lake Abrau – Lake Maly Liman. The existence of their hydraulic connection was proved, as well as the presence of two aquifers – the perched water and groundwater.

Keywords: Maly Liman, Limanchik, Abrau, water balance, sediment layers, bathymetry, ground waters, underground drain, mineralization, sedimentations

The article presents an overview of the main possibilities of using hydrogen as a prospect for the "fuel of the future". Based on the main approaches to the development of hydrogen energy in foreign countries, the prospects for its application in the Russian Federation are described. An analysis of the accumulated experience of domestic and foreign companies working in the field of hydrogen energy, considering the introduction of mechanisms for the implementation of hydrogen policy, is presented. An assessment of the possibility of the Russian energy industry for the production and implementation of hydrogen, the relevance of the development of their advantages and disadvantages is presented.

Keywords: hydrogen, hydrogen energy, prospects for the use of hydrogen, combined power plant, development prospects, rating, emissions, production technology, low-carbon hydrogen, steam reforming

The paper presents the results of engineering and environmental surveys at the object of accumulated environmental damage - an unauthorized dump on the territory of the Shuvalov industrial zone in the Leninsky district of Nizhny Novgorod. A description of the study of the territorial and natural features of the object is given: landscape, representatives of flora and fauna, as well as data from laboratory studies of soil samples. An analysis of the morphological composition of the waste and data on the volume and mass of the disposed waste are presented. The level of microbiological, parasitological, and chemical contamination of soil samples with heavy metals is assessed. For carrying out reclamation work at the site, the authors of the work propose a composition that includes natural mineral-organic compounds. The results of the laboratory application of natural mineral-organic compounds with the production of soil-recultivator from the screening of landfill masses are presented.

Keywords: industrial and consumer waste, engineering and environmental surveys, unauthorized dumping, soil pollution, heavy metals, technogenic soil reclamation, reclamation soil

The article considers the results of a study aimed at establishing the constants of enzymatic kinetics of biological treatment of domestic wastewater in low-oxygen bioreactors of the circulating type and proposes methods for calculating such structures using the dependences of enzymatic kinetics Michaelis-Menten. The technological mode of operation of the reactor implies a total oxygen regime of not more than 1.1 mg / l at horizontal flow rates of 0.25-0.3 m/s. The efficiency of wastewater treatment is achieved by increasing the mass transfer of oxygen to the sludge mixture and directly into the flocs of activated sludge, as well as due to aerobic granulation by built-in secondary settling tanks.

Keywords: nitrification, denitrification, activated sludge, aeration tank, granular activated sludge, biological treatment, domestic wastewater, low-oxygen treatment method, energy saving, resource saving, ecology

Ecology is an acute problem in the modern world. At many enterprises and in many processes, they strive to reduce emissions of waste and natural gases that have a negative impact on the environment. The author of the article suggests using energy-efficient technologies in housing construction, namely, when carrying out major repairs of apartment buildings in the city of Moscow. In this article, the author considers technologies that reduce power consumption, which can also be applied during major repairs. In particular, an important role for reducing emissions of harmful substances into the environment is the reduction of heat consumption in apartment buildings. The result of the introduction of the technologies listed in the article will be an improvement in the standard of living in the old housing stock.

Keywords: capital repairs, city environment, factors, building, energy efficiency, heat loss, apartment building, ecology, emissions, waste

The results of a study of the nature of the occurrence of fine dust particles in the urban environment (on the example of the city of Volgograd) are presented. The sources of dust release in the form of ground dispersed massifs represented by loess and clayey soils are considered. The results of determining the mode of variability of the parameters of the mechanical composition, physical properties in two directions of dust drift (southeast and north) are shown. Studies of loess and clayey rocks for radon content were carried out. It was revealed that the dispersed soils under consideration are characterized by significant indicators of the effective specific activity of radon. Researches of pollution of a snow cover are carried out. It was found that the snow cover, in addition to technogenic accumulations, contains particles of fine dust. The results of the study will help in the implementation of predictive assessments of possible changes in the environment.

Keywords: atmospheric pollution, fine dust, urban environment, dispersed rock, wind flow, soil massif, radon content, drift trend of fine earth

The article raises an urgent problem for large cities - the fight against the negative consequences of road transport. The importance of urban planning measures to reduce the accumulation of emissions, as well as green spaces to reduce the concentration of dust content of harmful substances in urban areas is considered. The data of CO concentration near the mainline territories in 95 studied points were analyzed.

Keywords: road transport, dust, gas-protected green areas, leaves, green spaces

This article is devoted to the study of concentrations of carbon monoxide (II), phenol, formaldehyde, aliphatic hydrocarbons in the premises of buildings, including the assessment of the regularities of their vertical distribution in the height of buildings at different times of the day from vehicles. Research is necessary to develop a program for electronic computers, which is necessary for the design of construction projects.

Keywords: помещения, оксид углерода (II), фенол, формальдегид, углеводороды алифатические, здания, время суток

Monitoring of aerosols in the atmospheric air of residential areas of settlements ensures their environmental safety. Aerosol particles are capable of adsorbing various compounds, including metals, on their surface. It is known that heavy metals from the environment can penetrate into the human body and contribute to the development of various diseases. In this connection, their monitoring is relevant to ensure the environmental safety of residential areas of settlements. The purpose of the study was to study the indicators of the number and mass fraction of particles in the Sredneakhtuba district (Sredneakhtuba district, Volgograd region) for the spring-summer of 2019 in comparison with the conditionally clean zone. The material of the study was the leaves of Prunus armeniaca with aerosol particles. Leaves of Prunus armeniaca were placed in a glass container with 250 ml of distilled water, stirred for several minutes with a glass rod to wash particles from the surface of the leaves. As a result, aerosol suspensions were obtained, which were studied in terms of the number of particles and their mass fraction. The results obtained indicate almost the same amount of aerosol particles (PM10) in both territories. In terms of the mass fraction of aerosol particles (PM10), there is a significant excess of them in the experimental area. This fact may indicate the presence of metallic impurities in the aerosols of the residential area of ​​Srednyaya Akhtuba. At the same time, it should be noted that the high values ​​of the number of aerosol particles in the conditionally clean zone cast doubt on its status as a clean zone, since within a radius of 25 km. there is no anthropogenic load on it. The detected values ​​of aerosol particles give grounds to assume the action of a random factor (the introduction of aerosol pollution by transit air), or the action of an unknown natural source of pollution, which requires further research and study of the territory of a conditionally clean zone in combination with geochemical studies, etc.

Keywords: environmental monitoring, environmental risks, aerosols; number and mass fraction of particles