Table of contents

The paper highlights the relevance of using composite materials for reconstruction of heavy-duty concrete and reinforced concrete flooring in industrial buildings, stating that at the current stage of construction development special attention is paid to the use of steel fiber concrete flooring, as this material allows for reconstruction of industrial floors with minimum financial and labor expenditure. The novelty of the research lies in the fact that the adhesive between the flooring to be restored and reinforced and the new steel fiber concrete layer is a composite polymer-bitumen material with cement and graphite powder additives, which was previously experimentally developed by the authors. This material, given an adequate thickness, also serves as a structural spacing to level the surface of the underlying layer and reduce friction under the bottom of the upper steel fiber concrete layer and the existing floor. The paper describes the reconstruction workflow. The composition of the steel fiber concrete layer has been assumed based on the research of other authors. Although experiments proved the integrity and strength of the flooring after its reconstruction with the new technology, it is noted that the final characteristics of the proposed floor structures and workflow can only be assessed in the course of normal use, which can be the basis for further research aimed to optimize the thickness of the suggested composite layers. The experiment delivered certain labor and material cost figures for evaluating the economic efficiency of the use of the composites described below in the concrete flooring reconstruction.

The paper raises certain questions concerning the use of structural glass (glazing) in external vertical enclosures of modern construction systems, pointing to the need for combining composite materials, especially composite foam, in translucent enclosures, which helps dramatically reduce the weight of external panels while improving their heat and sound insulation performance. It also emphasizes the relevance of energy efficiency at the building operation and building construction stages, as energy efficiency is not only the heat saving performance during building operation, but also a high effectiveness of the construction technology.

The novelty of the study lies in engineering a wall panel possibly combining two materials — profiled glass and composite foam. The paper not only details the panel design, but also describes the manufacturing technology and the envelope arranging processes with two wall panel attachment methods and related joint assemblies. Based on a number of scientific publications, the handling mechanisms are discussed suitable for different ways of coupling the structural elements — wall panel and floor slab. Focusing on box-type structural glazing, the authors stress the need for further study involving other types of structural glass (channel shaped, ribbed, trimmed) to create multicomponent wall panels for a variety of regional climate conditions.

Environmental monitoring of the construction works must consists of the modern scientific methods and techniques of physical, chemical, and biological measurements for monitoring the construction sites intermittently or continuously. It determines the pollutant factors and makes the right environmental quality assessment.

During the construction period the environmental monitoring subjects are the construction waste water and the sanitary sewage, the surface water around construction site, the noises around the site and from the construction site engines (if the construction period has continuous operations, the monitoring takes place 24 hours a day) and the dust. Particular attention should be paid to monitor the concentration of fine dust particles, due to the negative impact on human health.

In order to get the effective data about the PM2.5 and PM10 fine dust particles concentration in the air during the construction operations a slightly polluted area was studied according to the map of the dust emission. This area is located in Zheleznodorozhny district of Rostov-on-Don up to the Seversky Donets River. The large residential development «Ekaterininsky» is under construction there.

The environmental monitoring of this fine dust polluted area included the study of three subjects.

The results of local dust emission showed the significant amount of fine dust from any height levels where construction works are carried out.

This article describes the results of environmental monitoring of dust pollution in Rostov-on-Don and environmental requirement and measures which should be designed in the Construction method statements and the Work performance projects for reducing the environmental impact during construction operations.

Today the most important task in the development of modern Russian cities is the environment formation and maintenance that is favorable and comfortable for the population. The authors of the article revealed the main state problems of public and courtyard territories in Russian cities. Programs analysis of the urban areas improvement for the period from 2018 to 2022, aimed at the development of the urban environment provides an example of its successful implementation as applied to the city of Rostov-on-Don.

In order to obtain a proved solution for composing a new type molding system, a model of main framework of a dome mold was made as compared with natural sizes on a scale 1/10. As a result of analyzing the values of its constructional and technical-economical parameters there has been found a completely new solution for constructing a molding system with thin-shielded molds.

Construction of a monolithic dome technologically is quite a complex and time-consuming process that in the first place is explained by the fact that an appropriate mold is necessary to create before.

It describes a completely innovative construction of a molding system of the dome of 12 m in diameter with thin-shielded molds in levels and with an original solution of connection and fixation of the curved edges of the cathedral the second in size in Georgia on Mount Makhata in Tbilisi being under construction. It has been established that it is very effective for the selection of a mold system of a large-diameter monolithic iron-concrete dome to carefully study and examine its minimized model.

It has been found out that by thin-shielded molds it is possible to compose separate load-bearing elements of various complexity and configuration included in the molding system. Also, the process of joining in thickened blocks of the above-mentioned elements as well as their mounting and firm fixation has been simplified. It should be noted as well unlimited possibilities of increasing extremely the features of their toughness by adding the edges of simple hardness. And what is more important, use of standard materials and molding devices significantly reduces labor and material consumption connected with formation of molds.

The work is devoted to the study of temperature conditions in the territory of the recreation zone of the ASTRC "Veduchi". The average monthly and annual air temperature values at various altitudinal zones were obtained. The climatic parameters values were determined as linearly dependent on the height of the terrain.

Nowadays it is necessary to make the environmental impact assessment (EIA) in order to identify, analyze and take into account the direct and indirect effects of environmental impact during the planning of design consideration for construction projects. The results of this assessment determine the aftereffects of a certain construction project's implementation. These results are the objective information about the future state of the environment of the territory for making decisions on the implementation of the planned project.

The economic component of this assessment is the determination of the cost of implementing measures to protect the environment of a given territory. Current design trends have a tendency to change the criteria for planning the construction projects. It is important to make the managerial, technical and commercial decisions during the project development in favor of the environmental safety of the construction industry. During the criteria of the assessment development, it is necessary to take into account the prevention measures. It is important to prevent the pollution but not to monitor and eliminate the negative effects.

This article considers an example of the calculation of the criterion for choosing the environmental pollution control measures which can reduce the construction cost. These calculations make it possible to determine the environmentally and economically suitable area for the construction of an object in the populated area.

The study is dedicated to identifying the influence of the tower crane location and its technical characteristics in panel housing construction for the duration of lifting operations. The organization of the construction site is represented by a triangle, at the tops of which a tower crane, a warehouse of panels and a place of installation are located. It is assumed that the delivery of goods is carried out separately by turning the crane and then moving the crane truck in the right direction. The computer model is described by a nonlinear trigonometric equation, the roots of which were found by the Newton method. As a result of a model study, it was found that to accelerate lifting operations, it is necessary to select a crane with a large boom reach and move it further away from the direct connecting warehouse to the installation site, achieving the isosceles of the triangle formed by the crane, warehouse and installation site, and also the minimum lifting time operation increases with decreasing angular velocity of the tower crane.

One of the main conditions for achieving the set value of the buildings and structures construction duration is the construction production planning. Due to the fact that the construction process has an uncertain dynamic nature, it is recommended to use probabilistic analytical models to determine such a calculated parameter as the duration. The article proposes a probabilistic model for estimating the duration of construction of buildings and structures on the basis of the normalized Erlang's law of the n-th order. This model allows, by changing the number and duration of work lying on the critical path, to assess the construction project completion probability within the prescribed period.

The article is devoted to the concept of sustainable development of renewable energy in the modern world. The concept of sustainable development of world energy is considered. The analysis of the current state of the fuel and energy complex is given. The principles of development and goals of the future sustainable world energy are given. The essence of sustainable energy development, environmental problems of the leading countries in the production of electricity is being considered.

The problems of mapping the territory of the Volgograd agglomeration for the planning of green building works are presented. The estimation of the application efficiency at mapping the geoinformation systems technologies urban landscapes degradation and restoration processes is given. The results of the agglomeration landscapes geoinformation mapping methods development using the large-scale satellite images are presented.

The article contains the discussion of materials on the principles of selection of multi-purpose design solutions for the construction industry when conducting a judicial construction and technical expertise, as well as the presentation and an algorithm for solving problems of this type. Based on the interpretation of results of theoretical works and analysis of judicial practice, a method was obtained that can be used when conducting a judicial construction and technical expertise in order to solve the issues of selecting design solutions and materials. When using this method, all rearrangements of variants are checked by their preference and compared with each other. The considered method has been continually applied in solving practical issues of judicial construction and technical expertise. Actually, this type of tasks is often found in the framework of arbitration processes when solving issues on the effectiveness of the use of budgetary funds. The use of the proposed algorithm is the most optimal for the preparation of conclusions of a forensic construction expert for cases of this category.

The paper deals with the problems of evaluating technical and organizational-technological solutions for repair and construction production at various stages. The choice of materials and technological options is carried out using the principles of consistency and complexity. The developed system for identifying the options makes it possible to describe in general terms any technical and organizational-technological solutions for the production of repair and construction works used in the overhaul practice, and those that will appear as the repair and construction industry develops. The work defines a scientifically based formalized set of indicators describing the methods compared versions of technical, organizational and technological solutions for the production of repair and construction works during capital repairs. The effectiveness of the developed method is confirmed by the representativeness of the research results carried out on the example of the production of works on the insulation of external walls during the apartment buildings overhaul.

Quang Ninh is a province in the North of Vietnam, located close to the sea and has high potential for economic development and conservation value with a wide variety of creatures as well as scenery. Coal mining activities in Quang Ninh province have had a great impact on the regional environment, including the coastal zone. Derived from the ability to measure and manipulate various materials and display on maps and drawings of the current status of the coast through time and space, the authors studied and processed the telecommunication data. Recruit multi-time to effectively monitor the variation of the coastal zone in general and the coast of Vietnam in particular, especially due to coal mining activities in Quang Ninh. The research results are important to provide the necessary data and information to support the planning and adjustment of coal production and exploitation in Cam Pha and Quang Ninh, Vietnam.

This article raises the problem of rapid development of cities, conditions for comfortable living, management of urban infrastructure and urban planning. Smart city is a tool for achieving strategic goals of socio-economic development of the city. Identified and described indicators characterizing the development of key areas of smart city: the environment, infrastructure, urban planning, construction and architecture. Also, the authors developed a method of improving the energy efficiency of the housing stock on the example of Rostov-on-Don and recommendations for improving its energy efficiency.

The authors studied and reviewed a brief history of regulatory documentation in the field of engineering surveys. The mechanism of quality control work is described. The problems in the organization of engineering surveys are identified. Suggestions to improve the system for providing engineering surveys with various types of resources are given.

There are renovation and conversion programs currently under way in all major Russian cities with million-plus population. Based on the findings of integrated survey of built-up areas, existing buildings and their architectural and space planning concepts, as well as the outdoor utility systems, and also taking into account economic expediency, developers make decisions on demolition of buildings or converting them into non-production facilities. Despite the available extensive international experience and a wide spread similar trend everywhere in Russia, no system-based, research-backed approach to such projects is known to exist. The article discusses the basic principles of forming a system that permits the interconnection of project participants, organizational structures and information bases, leading to an increase in the effectiveness of the project's main indicators, provides an opportunity for managers to quickly evaluate the activities of project participants and manage individual modules of the system. The main elements of the system are: conversion; information support, as well as organizational structure. The harmonious synthesis of these elements makes it possible not only to evaluate the existing level of efficiency, but also to design a system of interconnections, as well as to control it. The main basis for the formation of the possibility of designing this is the differentiation of the existing system and its elements into separate organizational and managerial modules. These modules allow to make their quantitative and qualitative assessment, which in turn, makes it possible to control the entire system.

Fault times occur due to the late delivery of building materials for which it is impossible to create a stock on a construction site (for example, a concrete mix) when erecting buildings made of monolithic concrete and reinforced concrete. High reliability of supply volume forecasting of building materials per unit time is required to reduce non-production fault times. Based on the equality intensity of the work performance and the structural materials supply intensity, the goal is to develop a generating forecast method of the demand for building materials, taking into account a given level of organizational and technological reliability. The use of classical methods of probability theory made it possible to develop a non-complex mathematical apparatus, which use reliably ensures high confidence of demand forecasts for building materials. The study results can be used in relation to building materials for which it is impossible to create a stock on the construction site, for example, a concrete mix. The practical application of these research results is capable of developing production plans reflecting the real possibilities of contracting organizations, including the production intensity increase of construction and installation works.

The article shows the feasibility of improving the manufacturability of the prefabricated monolithic floors reinforced concrete structures production by reducing their own weight. In the works of the authors, the reduction of the sole weight and the cost is achieved by using the light materials filling the inter-gully space. It is proposed to use gas-concrete, polystyrene foam concrete blocks or limestone-limestone blocks as a local building material in the Crimea with such materials for the advanced system MARCO. Due to that, the cost of the interfloor overlap device has been reduced by approximately 10%. In addition, there is an additional cost reduction also due to the improved ergonomic work performance, increasing the productivity of workers by 6%. Innovative design and technological solutions are also presented, replacing the part of heavy concrete in a flat floor slab with hollow cores made of lightweight artificial materials - expanded polystyrene, polyethylene or cement wood.

The article addresses the unified methodology lack problem for calculating the required number of stalls for people with disabilities in parking lots near various infrastructure facilities. To solve this problem, one of the possible algorithms for calculating this indicator is presented. this algorithm application is shown for the trade objects in St. Petersburg and the equation of the pair regression is found.

During the last decades, the problem of maintaining the level of the housing stock was solved by the residual principle. The low quality of housing due to the use of short-lived materials and projects not reflecting the real objects' state has led to accelerated rates of physical and moral deterioration of buildings. Implementation of the overhaul program is one of the priorities, but despite its significance, a number of problems of its implementation have been identified. The planning methods currently used do not properly reflect the changes taking place. The article proposes one of the possible solutions to the difficulties arisen, namely, the formation of a backlog on the program-target approach basis. Construction companies must diversify their backlog taking into account the existing workload and the lot structure determined by the customer.

The article deals with the assessment of reinforced concrete structures of a hazardous production facility, namely, the localizing facility of a nuclear power plant during the construction. The analysis of the methods applicability for determining the strength of concrete for this type of structures.

The monitoring results of the Saratov reservoir water quality for the period 2000-2018 are presented. The observations were carried out monthly at a stationary point located in the downstream of the Zhiguli hydroelectric station. It is established that the water quality in the water supply source is characterized by a significant seasonal variability. During the period of algal nuisance, the reservoir organic pollution increases, and the concentration of nutrients decreases. Excessive content of organic substances in the summer low water period complicates the technological processes of water purification. Phosphates, whch concentration drops to almost zero at the peak of water «bloom" are the limiting indicator inhibiting the algal nuisance.

The characteristic of fibrous by-products and their disposal methods is given. The scheme of the technology of pulp and paper waste processing with the production of granulated products for crushed stone-mastic asphalt concrete is presented. The analysis of the material flows of the technological complex is given. The expediency of the preliminary stage of particles micro-granulation in a pneumo-mechanical apparatus to reduce dust burden and increase the efficiency of the complex operation as a whole is shown. Two-phase flow parameters of the technological complex are determined. The aerodynamic calculation of the aspiration system of the complex before and after modernization was carried out.

Controlled pipeline heat supply systems are equipped with shut-off valves that causes a decrease in the stabilization level of the heat-transfer agent transportation process and reducing the pressure in the network during transition processes. Booster pumping stations are installed to stabilize the pressure in the heat supply system. The heat-transfer agent transportation process becomes turbulent that significantly reduces the hydraulic system stability when such systems are working. The process of transporting the coolant. Regulator that contains proportional, integral, and differential control components is used to control the dynamic parameters. Studies have revealed the reduction level of dynamic characteristics depending on the regulator components. The use of PID control allows to change the oscillatory process into acyclic process.

The building envelope thermal regime field studies without disturbing its structure and integrity during the transition period (autumn) are given. Experimental data on the building inner and outer walls temperature and the heat flux density were obtained using the "Teplograph" heat flux density meter. The temperature changes graph on the residential building outer and inner walls during the day is constructed.

The article discusses improvement of a flat solar collector with the heat exchange process intensifying aim, which improves the quality and the equipment efficiency in question. Based on the solar thermal plants' calculation, taking into account the design features affecting the generated energy amount, a comparative analysis of the characteristics of traditional flat solar collector and solar collector of intensified heat exchange with an independent heating contour was carried out. The theoretical study results of the thermal energy accumulation processes by solar receiving devices of two types are presented.

One of the urgent problems of housing construction modern development is the use of gas-powered equipment on natural gas for heating, hot water supply and food preparation. To solve this problem, Government Decree No. 1314 of December 30, 2013 is in effect in the territory of the Russian Federation The article sets out two options for the contractual obligations execution between the gas distribution organization and the applicant to connect to the gas distribution network of the capital construction object. As a result of the study, it was shown that the proposed measures, which allow to analyze the perspective connection to the gas distribution network and are aimed at reducing additional construction and installation works in the future, will help to increase the gas consumption networks development and reduce their connection times.

The industrial processes are noticed to be accompanied by the contaminators' emission inter alia the high-dispersion aerosols. To reduce the amount of the dust emitted into the atmosphere, it is advisable to provide the cleaning devices installation as a part of exhaust ventilation systems. Entrapped substances may be recycled or returned back to production, and it's especially valuable if rare and expensive row materials are used in manufacturing. Trapping aerosols of fine dispersion with simple and reliable mechanical devices with low energy consumption is quite important. The proposed apparatus for the dust particles cleaning emissions is with a dispersion of 0,1 μm. Device operation is based on enlargement and following entrapment of solid fine particles on slabs perforated by the way of chinks and irrigation water contaminated air by the nozzles with the particulate composition of from 2,0 to 10 μm. The chinks width on the first and the second slabs, displacement of chinks hole axes of the first and the second slabs relative to each other and distance between slabs ensure creation of increased coagulation and stable sedimentation of particles are discovered.

The paper is devoted to the present-day problem - improving air quality in the office space working area. A design feature of such premises is small height (about 3 meters). This makes difficult to supply the required amount of air without creating drafts in the working area. It can be noted that such a problem solution is related with the new materials and technologies use in practice. These include textile terminals made of 100% polyester woven with carbon fiber. This material has the following properties: high strength and wear resistance, minimal particles entrainment from the surface. Unlike steel galvanized air ducts, in the textile air duct it is possible to laser-cut precise holes with melted edges with the necessary pitch and diameter. A diagram of the personalized ventilation organization in the office space is presented on the basis of the developed air-distributing device with a micro-perforated textile liner. This device allows to adjust the air flow depending on the individual needs of the person up to shutting down the system in the absence of an employee. Reducing the flow of fresh air contributes to the ventilation system energy efficiency.

The article is devoted to the liquid substances' disinfection nature-like technology synergistic aspects on the atmospheric electricity impact principles on the Earth's biosphere. In the thesis form, a method, technological aspects, the disinfected liquid interaction synergistic moments with the proposed device reproducible blocks effects are suggested. It is proved that on the synergistic interactions' basis, the greening production processes in developing new areas efficiency increases dramatically.

The article is devoted to the aspects of surface water treatment under the external (meteorological) factors influence. The aspect of atmospheric thunderstorm activity, as the current technology of cleaning and disinfecting the Earth's air-water basin, is considered from the standpoint of the cyanobacteria functioning and its lysis mechanism. In the thesis form, aspects of the development and creation of a nature-like technology for disinfecting liquid substances based on the principles of atmospheric electricity are proposed.

An experimental study to determine the pressure loss of the flue gas heat exchanger proposed design in a collective chimney has been performed. The aerodynamic drag factor of a cone-spiral heat exchanger for the household boilers exhaust flue gases heat has been determined on the obtained experimental data basis.

The article discusses the main calculating methods of the dust removal systems. Calculation and design of systems for cleaning is made taking into account the technological features of the production process and operating conditions, the typical equipment designs use and the units and machines sizes minimum number use. As a rule, the dust deposited on the ceilings of the enterprise has smaller fractions than the dust removed from the nodes of the process equipment. What is important is the parameters selection of the dust collecting apparatus for the dust to be cleaned. So, to adjust the vortex dust collectors, when using the existing aspiration systems, for the dust removal purpose, it is proposed to use a probabilistic-stochastic approach to establish fractional efficiency. The vortex dust fractional collectors' efficiency depends on the probability of trapping dust particles of a certain diameter in the areas of installations. The procedure for determining the fractional efficiency of vortex dust collectors to adjust the stationary aspiration systems for dust removal is considered.

The article is devoted to the sedimentation study and settled dust subsequent resuspending. An assessment of the dust distribution patterns, knocked out of the process equipment by the method of Azarov-Boguslavsky. A mathematical model description of the dust resuspending process is proposed.

The article identifies the optimal method of operational control of wastewater turbidity generated during the production of water-dispersion paint material.

The statistic information about the amount of discharge of pollutants into water sources in Russia is studied. Also, the main problems of wastewater purification are discussed. According to the literature survey, the perspective directions in wastewater purification, as a result of the manufacturing activity of the food industry enterprise, are brought out here. It is offered to choose an electrochemical treatment as a basic stage of wastewater purification. And finally they offered to use a sorption final treatment. A machine called an electrolyzer-adsorber which was made by the authors is presented and described. The main technological parameters, which influences on the level and power-intensity of the electrochemical sorption purification happening in the machine are listed. The results of the experimental researches in choosing the optimum parameters in the wastewater purification machine called the electrolyzer- adsorber were studied at the one of the Volgograd food industry enterprise.

The results of studies of the main technological parameters of the process of water clarification with coagulant based on natural mineral raw materials are presented.

The article presents the research results of the sorption purification peculiarities of aquatic environment where surface-active substances (SAS) appear during the operation.

The main design flaws in terms of protection against young fish entering the water intake bucket, sediment inflows, sludge and floating objects, which largely do not provide the current regulatory environmental requirements for ensuring environmental safety (ES) of water intake technological complexes (WITC) directly interacting with the natural water environment (WE) of the water body (MPWS) as a part of the natural technical system (NTS) "WE-WITC-MPWS" were identified during the comprehensive studies to assess the functional effectiveness of existing water intake structures (about 44) of multi-purpose water supply systems ("MPWS.") of urban farms and settlements in the Lower course of the river Don from the Tsimlyansky reservoir to the mouth (Azov).

In order to ensure the operating "WITC" operating systems based on the results of constructive studies using domestic experience in the use of high-strength synthetic fabric materials, an innovative design of a water intake structure in the form of a soft floating structure (SFS) has been developed providing the regulatory requirements on the main indicators of ES by 85%-95%.

The main purpose of the Sengileevsky reservoir is currently the flow part accumulation of the Nevinnomyssky canal for municipal and industrial water supply of the city of Stavropol, the city of Mikhailovsk, Shpakovsky and Grachevsky districts, the irrigation of the river Egorlyk and the water supply regulation in the Rostov region and the Republic of Kalmykia, provision of water to the Right-Egorlyk Canal, Mezhdurechenskaya Environmental Protection Agency and incidentally, Egorlykskaya and Novotroitskaya Hydroelectric Power Station, Stavropol CPP. From the Sengileev reservoir water is supplied to the city of Stavropol and several other districts of the region, with more than 1 million people being provided with water. Water intake structures with a pumping station on the Sengileev reservoir are unique and have no analogues in Russia. Water is taken by pumps from a depth of 10 meters and then supplied by three pumping stations to a height of about 500 meters.

The water quality in the reservoir in different years mainly corresponds to classes II – III, "pure" or "moderately polluted" with a WPI close to 1, whereas in the tributaries for a number of sections the water quality may decline in certain periods to V-VI as "Dirty" and "extremely dirty".

The main idea of the work is to use an environmentally safe technology to combat drainage, pre-purification of water in front of the sewage treatment plant and ensuring uninterrupted water supply in settlements at any time of the year.

Based on the analysis of constructive-technological, functional operation of technical water supply systems of thermal and nuclear power plants (TPP, NPP and CHP) it is determined, that using water flow rates up to 100 m³ / s and more for cooling, which are taken from the water bodies (reservoirs, large rivers) and dumping the same amount of water heated to 8-10 degrees back, causes a multifunctional change in the aquatic environment. In order to balance the anthropogenic load on the water body used as a reservoir - cooler, various design solutions are currently used in selecting the estimated water discharges and dumping the heated water into a water body. The reservoirs are made of traditional building materials that require large capital expenditures, and most important, they are ineffective in protecting alluvial stations from the indication of various species young fish and in the distribution of the heated water on the water surface of the cooler reservoir. Based on the results of innovative and constructive studies of lightweight water intake structures and jet distribution structures made of high-strength synthetic fabric materials of domestic production, the soft floating structures (SFSs) have been developed. They provide protection of pumping units from young fish with an efficiency up to 90% as well as the environmentally necessary management of the distribution of heated waters on the surface of the reservoir-cooler. The achieved research results have successfully passed the industrial approbation at the Konakovskaya and Stavropol regional power stations.

The variants of calculation formulas for heat and mass transfer in the convective processes, the radiant heat transfer and the mass between water and moist air transfer are given, taking into account the contribution of each of these processes. The simplified calculation formulas for the following options were obtained: the amount of heat transferred by radiant heat is insufficient or can be neglected; the heat flux transferred by convective heat exchange is not significant; mass transfer has low effect on the heat transfer.

Practical observations of the ammonium nitrogen content at the existing wastewater treatment plant show its excess over the calculated concentration by 30–60%, which occurs due to the atmospheric nitrogen fixation and its transition to ammonium.

Hydrogen peroxide has been shown theoretically and experimentally to be an environmentally friendly oxidizer in the wastewater pretreatment technology in order to prevent and regulate corrosion processes in the systems and structures transporting wastewater, as well as nitrogen fixation, and can be recommended for practical use.

The use of the scientific and technological documentation (STD) in the new facilities design and construction allows the modern technological and technical solutions use proven by operating practices that ensure the treated wastewater regulatory quality. However, the questions about the application of STD and modern construction materials at existing wastewater treatment plants, as well as being in commissioning mode remain.

Based on the physical survey materials of existing wastewater treatment plants using statistical models, it was shown that the infiltration and rain effect flows on the contaminants' composition transported through the sewage collector is insignificant and should not be taken into account, and when choosing a re-technology scheme for treatment facilities polluted stream, i.e. concentrated wastewater.

The energy infrastructure modernization is a complex social and technical problem requiring an integrated approach. After analyzing the hot water system operation in a residential apartment building, being previously a hostel, the reason for the temperature regime violation was determined. In connection with the building status change, the residents number has significantly decreased, the service block, which led to a change in water consumption conditions has been eliminated. In addition, the requirements for minimum water temperature in centralized hot water systems have changed. The question of using a dead-end hot water supply system possibility, provided by the project or its reconstruction into the circulation network, was considered. The studies were conducted in accordance with the methodology described in MIC 4.3.2900-11 "The centralized hot water supply systems hot water temperature measurement". There was a discrepancy in the temperature coolant standard indicators at the dismantling points on different floors of the building. The difference in temperature at the input (the heat meter and thermometer readings) and at the end user is associated with additional water cooling in the supply pipes of the domestic hot water heating system. When transferring the public buildings to housing stock, it is necessary to revise not only water consumption rates, but also the hot water supply scheme in general. The lack of circulation leads to waste of hot water and increases the cost to the consumer. To ensure the required temperature standards for a full day in a dead-end hot water supply system, which is provided for by the project, continuous dismantling of the water is required, which is difficult to achieve with a changed building status. The resolution of the problem is possible only when the domestic hot water heating system is switched to the circulation mode with the circulation piping and the circulation pump installation.

At the present stage of water management complex development as a part of the agricultural-industrial complex (AIC), there is an ambitious task to create fundamentally new technologies for using water resources for existing and emerging irrigation and watering systems (I.W.S.). Based on the transformations in natural environments natural processes unity (atmosphere, hydrosphere, upper layers of the lithosphere and soil cover) aimed at the water resources formation (surface and underground runoff) within the basin geosystem under consideration spatial limits, with water use technological processes at I.W.S. as a part of the natural-technical system (NTS) "Environment - I.W.S. – Population" ("E.- I.W.S. - P."), presents the comprehensive studies results of the processes of interconnection, interaction and relationship (IIR) of the I.W.S. technogenic component with E. and living P., on the basis of which the methodological foundations were developed for putting forward the new ideas on water resources use, where the central concept is the "Ecological Acceptability" of design decisions, stipulating the system principle of the principal role of the whole in relation to the main problems of Energy, Water, Food and Ecology. The I.W.S. environmental acceptability is determined by the current regulatory environmental requirements for environmental safety (ES) in the areas of I.W.S. influence. Based on the comprehensive research results, the constructive and technological requirements are formulated for providing electronic components in design solutions, as factors in providing electronic information for I.W.S.

The present article is concerned with the problems of recycling and reuse of waste generated in the electrolytic production of sodium hypochlorite at water treatment plants. New engineering solutions aimed at ensuring environmental safety and lack of waste during large-scale production of sodium hypochlorite from aqueous solutions of common table salt are recommended herein.