OBJECT. To consider problematic issues related to measurements of radionuclides in the air of the working area released during repackaging of bulk solid radioactive waste during decommissioning of nuclear energy facilities. To develop a method of direct measurements for operational control of the concentration of radioactive aerosols in the air of the working area, ensuring that the control level is not exceeded by the annual effective dose of personnel.

METHODS. To solve this problem, the method of calculating the maximum possible number of alpha particles on the selected sample of the analytical filter AFA-RSP20 was used.

RESULTS. A method of operational control of the radiation situation in the workplaces of personnel using direct measurements by portable radiation monitoring devices of the alpha particle flux density from the exposed AFA-RSP20 filter is proposed. The use of this method makes it possible to provide control in cases where the use of standard installations for measuring the volumetric activity of radioactive aerosols is unavailable or impossible. The article describes the relevance of the topic, the calculation of the reference level of the alpha particle flux density from the surface of the AFA-RSP20 filter is given.

CONCLUSIONS. Passport characteristics of personal respiratory protection equipment do not provide convincing data on the operation of the filter with a specific pollutant. For the correct decision-making on the use of certain types of personal respiratory protection by personnel working with radioactive waste containing transuranium radionuclides, it is necessary to control the volumetric activity of radionuclides in the air. Based on calculations and direct measurements, it is shown that the use of an operational method for measuring the alpha particle flux density from an exposed AFA-RSP20 filter makes it possible to monitor the radiation situation at personnel workplaces during decommissioning of nuclear energy facilities.

THE PURPOSE. Development of promising directions for improving the technology of an oil refinery (refinery) based on the use of heat from low-temperature sources of the primary oil distillation system.

METHODS. The analysis of the technological scheme of the refinery carried out, in order to identify the most energy-intensive system, while using the methods of analytical and thermodynamic analysis. The analysis of energy use in the circuit of an electric desalination plant (EDP) is carried out according on the basis of the data of the technological regulations of the existing EDP-AVT-7. The assessment of the feasibility of the proposed directions and developed solutions was carried out on the basis of the methods of technical, economic and environmental analysis.

RESULTS. This article shows the relevance of the problem and substantiates the importance of its consideration for improving energy and environmental efficiency. Based on a common scheme for the primary processing of crude oil, it is noted that this technology has significant energy saving potential. It is proposed to implement promising directions for the rational use of heat, and a modernization solution is presented aimed at improving the technological elements of the EDP-AVT-7 circuit based on the heat recovery of the hydrocarbon vapor-gas mixture.

CONCLUSION. The proposed directions and developed measures for the use of heat from low-grade sources in the refinery scheme show their promise due to a significant reduction in technological energy losses, a reduction in fuel consumption and an increase in the efficiency of its use, which, in general, will positively affect the economic and environmental situation in the region.

The relevance of the work is explained by the absence of the results of the heating effect of multicomponent coal-water slurries on rheological properties and characteristics of spraying in the literature.

PURPOSE. Efficiency substantiation of thermal preparation of coal-water slurries based on pyrogenetic liquid by the results of experimental studies.

METHODS. When solving this problem, the Brookfield RVDV-II+Pro rotary viscometer, general-purpose hydrometers, and the Interferometric Particle Imaging method were used.

RESULTS. It was found that when water in coal-water fuel is replaced by a similar amount of pyrogenetic liquid (no more than 25%), the density of the slurry increases by 14% at a temperature of 293 K. Preheating of coal-water slurries to 363 K reduces the increase in the density value to 7%. The experimental results showed that the greatest influence of the thermal preparation of the studied slurries on their dynamic viscosity is characteristic of the temperature range from 293 to 333 K. At such temperatures, a decrease in the viscosity of the fuel is possible by 17-20%. Preheating of slurries before spraying in the temperature range from 293 to 333 K makes it possible to increase jet spraying angle by 21-29% in comparison with two-component coal-water fuel at a temperature of 293 K. Substitution of more than 25% by weight of water with pyrogenetic liquid in coal-water fuel is impractical for the studied grade of coal from the point of view of a significant increase in viscosity. Preheating coal-water fuel before spraying reduces the average droplet size by 5-9%.

CONCLUSION. The efficiency of thermal preparation of coal-water slurries based on pyrogenetic liquid by the results of experimental studies of rheological properties and spraying characteristics was substantiated.

THE PURPOSE. Analysis of existing circuit and technical solutions for improving the quality of electricity in networks with traction load and assessment of their compliance with new properties of the electric network when switching to an active adaptive platform. Determination of the features of the operation of electric networks with traction load during the transition to an active-adaptive platform. Review of existing technical means and circuit solutions for improving the quality of electricity in electric networks with traction load and their analysis for compliance with new properties of the electric network.

METHODS. To solve the tasks set, a structural analysis of existing technical and circuit solutions was performed to improve the quality of electricity in electric networks with traction load.

RESULTS. In this article, the systematization of the compliance of technical means with the solved problems in the field of electricity quality is carried out. The features of the operation of electric networks with traction load during the transition to an active-adaptive platform are determined. Modern technical means and circuit solutions corresponding to the new properties of the electrical network are revealed. A variant of combining technologies for a complex effect on the quality of electricity is proposed.

CONCLUSION. When switching electric networks with traction load to an active adaptive platform in order to improve the quality of electricity, it is advisable to use technical means capable of providing PCE within acceptable limits in real time, depending on the operating modes of the power system and traction load. Such means include distributed generation, electric energy storage, active filter-compensating and balancing devices, FACTS technologies of the second generation. Classical approaches to solving problems with the quality of electrical energy based on the use of passive technical devices do not correspond to the new properties of active-adaptive networks with alternating current traction.

THE PURPOSE. Improving the energy efficiency of open cell foam materials with different geometries (SC, BCC, FCC, DEM) and with different medium porosities (ε=0.7; ε=0.75; ε=0.8; ε=0.85; ε=0.9; ε=0.95) by numerical simulation. To determine the influence of the geometry and porosity of an open cell foam material on the values of pressure drop, heat flux and energy efficiency factor.

METHODS .Numerical simulation was carried out using the ANSYS Fluent 19.2 software package. Geometric models of porous structures are sets of intersecting spheres with different packing structures: periodic Simple Cubic packing (SC), Face Centered Cubic packing (FCC), Body Centered Cubic packing (BCC), and random structure generated by the discrete element method (DEM).The calculations were carried out at the following air flow velocities: 0.01; 0.05; 0.25; 0.5; 0.75; 1; 1.25 m/s.

RESULTS. Atair flow velocities of 0.01 m/s and 0.05 m/s, all the studied structures show approximately the same heat flux. With porosity values ε=0.75; ε=0.8; ε=0.85 the highest values of heat flow were shown by the FCC structure, with porosity ε=0.7; ε=0.9; ε=0.95 the BCC structure had the highest heat flux. This is explained by the fact that, at the corresponding porosity values, the FCC or BCC structure had the largest surface area, which provided the largest heat flux. With the porosities of media ε=0.7 and ε=0.75, the BCC and FCC cell packages show a high pressure drop. With the porosities of media ε=0.8 and ε=0.85, the highest pressure drop corresponds to FCC cell packing, and for porosities ε=0.9 and ε=0.95, to BCC cell packing.

CONCLUSION. With equal high porosity, the BCC cell packing provides a higher value of heat flux than the FCC structure. The SC package has the lowest heat flux values for all studied porosities. The SC package also has the lowest pressure drop values and therefore the highest energy efficiency values.

THE PURPOSE. theoretical substantiation of resource-saving technologies and development of "terminal" electromembrane installations when creating a low-flow water use system for energy facilities of the Republic of Tatarstan.

METHODS. In the work, the methods of system analysis were used and a mathematical model was developed to describe it. The description and technical characteristics of the developed devices and installations for testing the proposed technologies are presented.

RESULTS. At Kazan CHPP-3, a technology was developed and a pilot electromembrane plant was installed for the disposal of blowdown water from the thermal desalination complex. As a result of the operation of the electromembrane unit, a transparent alkaline solution is formed with a pH of 13.86 and a concentration of OH ions of 2.7% (up to 4%). The content of salt components in the concentrate is 2% by weight. The resulting concentrated alkaline solution can be used in the cycle of the station for the regeneration of anion exchange filters of the 1st stage. The softened saline solution is fed to the heating network. The electromembrane plant processes 0.5 tons per hour of alkaline wastewater with a ratio of concentrated alkaline solution to softened brine of 1:9. The specific power consumption is 6 kWh per 1 ton of blowdown water. The operation of the plant is characterized by the complete absence of waste and bezreagnosti. At the ion-exchange water treatment plant of the Nizhnekamsk CHPP-1, a method was proposed, a technology was developed, and an experimental pilot plant was installed for processing alkaline spent regeneration solutions of anion-exchange filters. The electromembrane plant processes 1.5 tons per hour of alkaline waste. The capacity of the plant is 0.1 tons of 4% alkaline solution. Specific power consumption - 4 kWh per 1 ton of alkaline waste solutions. During the operation of the installation, there is a complete absence of waste with a reagent-free wastewater disposal process.

CONCLUSION. The return of regenerated alkali solutions and softened water to the production cycle makes it possible to obtain a significant improvement in indicators that characterize environmental friendliness and resource saving without the use of chemical reagents.

THE PURPOSE. Increasing the efficiency and efficiency of power plants based on renewable energy sources should be carried out by improving technological, constructive, organizational, legal, technical and economic measures. Proposals are given for the development of approaches to assessing the efficiency of wind power plants based on the Savonius rotor. The design parameters are substantiated and a physical model is created for a comprehensive study and performance characteristics in laboratory conditions.

METHODS. Based on the methods of physical and mathematical modeling of structures and profiles of wind turbine blades, the technical and economic indicators of various profiles of the blades of the Savonius rotor are determined.

RESULTS. The theoretical substantiation of the design and various profiles of the blades of the Savonius rotor is carried out. On the basis of a comprehensive study of performance characteristics in laboratory conditions, the values of the wind energy efficiency coefficient, the rotation frequency of the wind wheel profile, and electric power were established.

CONCLUSION. The results of the study can be applied to substantiate the widespread use and creation of wind power plants with a Savonius rotor to ensure high-quality and reliable power supply to remote consumers of electric energy, the creation of isolated power systems and the further development of alternative energy sources in the domestic electric power industry

THE PURPOSE. Consider the issue of the presence of distortions in the form of sinusoidal voltage and current in autonomous electrical power systems with electrical propulsion systems, built on the principle of the unified electric power system. Compare the results of the study of voltage distortion for electrical power systems with electrical propulsion systems of various structures and give recommendations for their application.

METHODS. For research, unified electric power systems with DC electrical propulsion systems on the Yeysk ferry and alternating current on the asymmetric icebreaker Baltika are considered. The possibilities of programming with frequency control of modern drives of rudder propellers with AC motors are analyzed.

RESULTS. Oscillograms of voltages and currents of generators were obtained using thyristor converters and inverters to control electrical propulsion systems in various modes. Significant ripples and distortions of the sinusoidal voltage and generator currents were noted when thyristor converters are used to power DC propulsion electric motors. Also, small deviations from the sinusoidal form of the ship's network voltage were recorded when inverters were used to control AC propulsion motors as part of rudder propellers.

CONCLUSION. The issue of ensuring the quality of electricity produced in autonomous electrical power systems of sea vessels is of great relevance and importance. To ensure the best results, it is advisable to use azimuthing podded drive with AC electric motors, the rotation speed of which is implemented by inverter frequency converters with a DC link.

The PURPOSE of the study is to improve the efficiency of district heating systems. To achieve this purpose, the following tasks must be completed. To consider the problems of functioning of an open heat supply system functioning. Perform an analysis of technical solutions for the modernization of local heat distribution and metering station are presented. To develop a technological scheme of local heat distribution station with a hot-water supply system. To determine the main technical, economic and investment indicators of the developed technical solution.

MATERIALS AND METHODS. Measurements were made using the local heat metering station. When solving the set tasks, a methodology for assessing efficiency was applied with the calculation of capital and operating costs, including the calculation of the payback period.

RESULTS. A new scheme for regulating of hot water supply system recirculation with open connection of consumers to a centralized source is proposed. The results of the implementation of the developed technical solution of local heat distribution and metering station for apartment buildings in Yoshkar-Ola city are presented. An experimental study of the effect of a joint additional installation of a pump and a control valve on the hot water supply system recirculation line before the mixing unit for hot water recirculation with return pipe and before the direct-acting temperature controller was the first to do. As a result, the consumption of district water was reduced by 36 - 39%, the temperature in the return pipeline was reduced by 13.5%; the enthalpy of the hot water was reduced from 0.168 to 0.145 Gcal/m³, the required circulation in all risers of the hot water supply system was ensured.

CONCLUSION. The use of the developed technical solution for the modernization of local heat distribution and metering station increases the efficiency of district heating supply systems. Calculations made on the basis of the readings of automatic custody heat transfer meter showed that the payback period for the technical solution is 40 days. The proposed solution is recommended for use in local heat distribution station of open heat supply system in order to reduce water rate, lower the temperature in the return pipeline and reduce heat losses, improve circulation in all riser pipes of the hot water system.

THE PURPOSE. Consider the problems of the heat transfer process in the structural elements of the LED light source. Describe the cooling system of an LED light source using an equivalent circuit and thermal resistances. Conduct a comparative analysis of cooling systems for LED lighting devices. Perform thermodynamic calculations of the light device radiator using computer programs of automatic design systems. Suggest a way to improve the heat transfer properties of the radiator of the LED light source.

METHODS. When solving the tasks set, the method of retrospective-prospective meta-analysis was used, computer programs of automatic design systems and direct determination of technical parameters using measuring instruments were used.

RESULTS. The article describes the relevance of the topic, discusses the features of the heat transfer process in the structural elements of the LED light source. Thermodynamic calculations of the radiator of the lighting device were made using computer programs of automatic design systems KOMPAS and SolidWorks. The article proposes a method for improving the heat transfer properties of the radiator of an LED light source.

CONCLUSION. There are many different cooling systems with their own advantages and disadvantages. The most efficient cooling systems are forced cooling systems, however, their use entails an increase in the final cost of the lighting device and a decrease in its light output due to an increase in energy consumption. Passive cooling systems are relatively cheap, but to provide effective cooling of LEDs, they must have a sufficient area of contact with the heat source, have good thermal conductivity and heat dissipation. In this case, the best way to improve the heat transfer properties of the radiator is to apply a special coating with a high heat transfer. This will increase the cooling efficiency with minimal cost without resorting to a significant change in the design features of an existing system.

THE PURPOSE. To evaluate the effect on the condensation process of contaminants contained in the steam and deposited on the surface of the cooled fins, for which to formulate a mathematical model of the process, to investigate its properties and to obtain quantitative estimates of the characteristics.

METHODS. The equations of the mathematical model are based on the laws of conservation of energy and mass, their study and evaluation are carried out using analytical methods of the theory of differential equations, methods of similarity theory and dimensions, as well as numerical methods for solving boundary value problems.

RESULTS. The formulation of the problem of condensation of vapor containing solid particles on the edge is formulated. The presence of a self-similar solution is revealed, which is represented as a dimensionless function of one variable, uniform for all sets of initial parameters. The relations describing the distributions of the thickness δ(x, τ) of the sediment and the temperature ϑ(x, τ) on a straight edge of unlimited height (l = ∞) with an initially clean surface (h0 = 0) are obtained. These relations also almost accurately describe the initial stage of such a process on a straight edge of a finite height l, until a sediment of noticeable thickness covers the entire surface of the rib, as well as the initial moments in the case of an edge on a round pipe, until the width of the sediment zone with a noticeable thickness is significantly less than the radius of the pipe.

CONCLUSION. Using these distributions as the initial ones for edges of limited height instead of, for example, introducing a uniform initial layer h0, will allow achieving high accuracy of numerical calculations without excessive thickening of the grid in coordinate and time.

TARGET. The purpose of this work is the development of a 3-D model of a power transformer to study the oscillation parameters and determine the technical condition. The technical condition of the power transformer is analyzed by the vibration amplitude spectra formed using the fast Fourier transform algorithm.

METHODS. To determine the informative frequencies of objects of complex shape, such as a power transformer, it is advisable to use the finite element method (FEM), implemented using computer simulations in the COMSOL Multiphysics software

RESULTS. According to the results of the calculation of the frequencies of mechanical vibrations of the magnetic circuit of the transformer, informative frequency ranges were determined to determine the level of technical condition of the power transformer.

CONCLUSION. Finite element modeling makes it possible to represent a transformer as a discrete system consisting of components interconnected at nodal points, which will allow modeling transformer defects and determining its vibration parameters in different technical conditions.

THE PURPOSE. The rapid development of electric transport requires the use of an energy-efficient drive in order to increase the range of runs between battery charges. This, in turn, requires research to optimize the electric drive system based on an asynchronous motor with a combined winding.

METHODS.. A combination winding motor is a high performance motor with a stator winding consisting of a combination of two star and delta windings connected in parallel. The structure and mathematical model of the engine, which are the basis for constructing the engine control algorithm, are considered. The control algorithm based on determining the optimal value of the magnetic flux in the coordinates of the d - q axis to achieve low power losses, taking into account losses in the iron core and low magnetic saturations, helps to improve the efficiency of inverter control.

RESULTS. The algorithm is pre-tested with several simulations and then experimentally verified by applying the proposed control technique to a 1.5 kW controlled field induction motor (FOC) drive.

CONCLUSION. The obtained results are presented and discussed, demonstrating that the proposed inverter online control technique can significantly reduce the power loss of the electric drive.

THE PURPOSE. Currently, brushless motors – electric machines with permanent magnets on the rotor and a rotor position sensor controlled by a sinusoidal voltage from frequency converters, are widely used in mechatronic and robotic systems. The control algorithm is formed on the basis of information about the current values of the parameters brushless motor mechatronic system using a nominal or reference mathematical model, which is, as a rule, an idealized representation of a real device. The non-stationarity of the parameters object of study, as well as the possible uncertainty of its mathematical description due to the simplification of the mathematical model, lead to undesirable or unacceptable results when forming the control algorithm of the mechatronic system. The problem arises of analyzing the dynamic characteristics of a brushless motor under conditions of parametric uncertainty in order to determine the parameters that most affect the functioning of the mechatronic system and the phase coordinates that are sensitive to these changes.

METHODS. When solving the problem, methods of the sensitivity theory are used to obtain the corresponding vector-matrix equations, the solution of which is carried out by means of the MatLab software environment.

RESULTS. In this paper, sensitivity equations are obtained for the active resistance and projections of the stator winding inductance on the longitudinal and transverse coordinate axes, as well as for the moment of inertia of the brushless motor. A vector-matrix block diagram for calculating the sensitivity functions of a brushless motor is formed, the characteristic feature of which is the presence of a non-zero matrix of free terms, reduced to the input of the sensitivity model. The corresponding Simulink models were built to study the influence of the listed quasi-stationary parameters on the rotation speed and torque on the shaft of the object of study. An analysis of the statistical characteristics additional motion of the specified phase coordinates of the brushless motor has been carried out, and graphical dependencies and steady-state values of dispersions and relative estimates have been obtained.

CONCLUSION. An analysis of the dynamic characteristics of a brushless motor under conditions of parametric uncertainty made it possible to determine that the rotation speed of the machine is the most sensitive to parametric disturbances. This coordinate is the most informative and is of maximum interest in the formation of an optimization algorithm for a mechatronic system. The decisive role in the formation of the additional movement of the output coordinates of the brushless motor is made by a change in the projection of the stator inductance on the transverse coordinate axis, which is an order of magnitude greater than the contribution to the additional movement of coordinates from other unstable parameters. It is expedient to use the results obtained in the course of the study when constructing an optimal control algorithm for a mechatronic system under conditions of parametric uncertainty.

THE PURPOSE of this article is to analyze existing and promising methods of dynamic reprogramming suitable for use in a mobile robot with a modular control system architecture. The article briefly describes functional-modular architecture of the control system (CS) of a mobile robot implementing distributed computing, which makes it possible to ensure the real-time operation of the modules’ CS even when it’s built using low-power embedded systems. The article describes features of 4 different methods according to 6 criteria: applicability on different embedded systems, the amount of operating and program memory required, the speed of calculations, the theoretical complexity of creating an implementation of the method, the theoretical complexity of using the method by the end user (tuner), the flexibility of the method being created. The results of this study are given in form of recommendations for the application of the considered methods in different environments and purposes.

THE PURPOSE. Consider the problems of determining the energy parameters of electrical equipment elements of electrical complexes for oil production with submersible electric centrifugal pumps. Develop a methodology for determining the parameters of the equivalent circuit of an electric motor for oil production when connecting compensating devices to the terminals of the electric motor of a submersible pump. Develop a methodology for calculating the energy performance of electrical equipment elements of an electrical complex with electric centrifugal pumps. Carry out simulation modeling of an electric motor for oil production with a directly connected compensating device.

METHODS. When solving the tasks set, optimization methods were used in terms of efficiency, power factor correction methods, methods for calculating the electromagnetic field by finite elements, methods of mathematical and computer modeling in the ELCUT software package.

RESULTS. Improving energy efficiency and reducing costs in the operation of submersible pumping units for oil production is an urgent problem and dictates a reasonable solution. The price of extracted oil depends on the following indicators, such as climatic conditions, equipment used, depth of oil deposits, remoteness of the field from central roads, and so on. The most significant energy-intensive processes in oil production include: electromechanized oil extraction, oil transportation, reservoir pressure maintenance system. A technique for finding the parameters of the equivalent circuit of an electric motor for oil production and a study of the effect of reactive power compensation on an electric motor in an oil well when compensating devices are connected to the terminals of the electric motor of a submersible pump are proposed. A method for calculating the energy performance of electrical equipment elements of an electrical complex with electric centrifugal pumps is proposed. The calculation of a compensating device in an oil well for an electric centrifugal pump with a frequency-controlled electric drive must be implemented taking into account the highest value of the output network frequency. Simulation modeling of an electric motor for oil production with a directly connected compensating device was carried out to establish the effect of a reactive power compensating device inside an oil well on the rotating electromagnetic moment of an electric motor for oil production. The indicators of the electromagnetic torque and the electromagnetic field of an electric motor for oil production without a connected compensating device and with a directly connected compensating device are presented, the supply wires of which in the first version are laid along a single route and in the second version are laid at an angle of 120 ° relative to each other in the corresponding grooves of the stator winding of the electric engine for oil production.

CONCLUSION. When conducting a study of the effect of a directly connected compensating device on the electromagnetic torque of an electric motor for oil production, it was determined that additional windings of a directly connected reactive power compensating device, laid at an angle of 120 ° relative to each other in the corresponding grooves of the stator winding of the electric motor, increase the efficiency and electromagnetic torque of an electric motor for oil production by 11% and 15%, respectively.

THE PURPOSE. To carry out mathematical modeling of interrelated physicochemical processes in radiation chambers of tubular furnaces of pyrolysis of hydrocarbons. Perform numerical calculations of heat and mass transfer in the furnace furnace chamber with a multi-tiered arrangement of wall burners on the side lined walls.

METHODS. Using our own package of applied programs based on the numerical solution of a system of differential equations of energy conservation and equations of radiation gas dynamics, the fields of velocities and temperatures of natural gas combustion products in the radiation chamber of a hydrocarbon pyrolysis tubular furnace are calculated. Interrelated processes of natural gas combustion, radiant-convective heat transfer, and turbulent flow of flue gases take place in the radiation chamber. These processes are modeled by two-dimensional equations of the combustion model, energy transfer by radiation, and equations of motion. In the side walls of the radiation chamber on both sides in eight horizontal tiers there are wall burners in the amount of 128 pieces. Combustion products emerging from the nozzles of these burners create complex velocity and temperature fields in the chamber volume. Due to the radiation of flue gases, the smallest soot particles and hot lined walls of the radiation chamber, heat flows are formed to the tubular screen, where hydrocarbons are pyrolyzed to produce ethylene.

RESULTS. As a result of calculations, the velocity fields, the temperature in the volume of the radiation chamber and the concentration of the main components of the combustion products were obtained. Local values of surface densities of radiant heat fluxes to reaction pipes for methane and propane pyrolysis furnaces are calculated. Comparisons of some of the results obtained with the readings of the devices of existing technological installations are carried out.

CONCLUSION. Calculations show that the developed software package makes it possible to obtain realistic values of local velocities and temperatures in the radiation chambers of tube furnaces, surface densities of convective and radiant heat fluxes to boundary surfaces, and other thermal and gas-dynamic parameters in the furnace volume. With a multi-row arrangement of a large number of wall burners of low thermal power, a complex field of temperature and velocities of combustion products in the furnace volume is formed on the side walls of the radiation chamber of the furnace. At the same time, this arrangement of the burners ensures a fairly uniform distribution of heat flows over the surface of the tubular screen of the hydrocarbon pyrolysis furnace.

THE PURPOSE. Detection of the dependences between the toxicity index of the components of crystalline solar panels EVA and Tedlar® and the factors of sample preparation of water extracts used in biotesting on the chemotactic reaction of Paramecium caudatum test objects using Biotester-2M as an analyzer. These factors included: the temperature of the extract, the exposure time of the extract of the studied objects in distilled water, and the use of otherkind of extract.

METHODS. In the course of the study, the biotesting method for the chemotactic reaction of Paramecium caudatum was used. In the experiments, an aqueous extract was prepared in accordance with PND F T 16.3.16-10. The resulting extracts were analyzed on a Biotester-2M device. For each experiment number, a study was carried out in three cuvettes, from each of which the device took 10 values. To assess the influence of extract temperature factors and exposure time, an experiment was carried out for temperatures of 4°C and 35°C, which allow taking into account the temperature at solid waste landfills at different times of the year. The extraction times were chosen to be 1, 7, 21, 28, 42 and 56 days. Data analysis was carried out using two-way replicated analysis of variance implemented using MatLab® tools. To assess the effect of the extraction medium, an experiment was carried out with the replacement of distilled water as an extract with mineral water of the Bonaqua brand and 1% acetone solution.

RESULTS. The error probability of the hypothesis about the influence of temperature and exposure time factors of the extract on the toxicity index was calculated at given significance levels. A comparative analysis of the average toxicity indices for the studied extraction media with distilled water, which is used as an extraction medium in approved biotesting methods, was carried out.

CONCLUSION. For complex organic compounds such as EVA and Tedlar® the toxicity indices will depend on a number of factors: the temperature of the extract, the residence time of the components in the extract, and the extraction medium.