The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution of water bodies, land, and atmosphere. Therefore, this paper analyzes the directions of phosphogypsum recycling and possible alternatives to its use. The main disadvantages of the existing methods of phosphogypsum processing were identified and trends in this waste management were also considered. Through the VOSviewer programme, a visualization of cluster interconnections was carried out in research publications of various fields of phosphogypsum utilization. Five clusters were formed: a red cluster—phosphogypsum recycling in the construction industry; green cluster—radiation pollution problem of phosphogypsum and phosphate fertilizers; yellow cluster—monitoring migration of phosphogypsum components in the ecosystem, with the mobile forms of heavy metals and their inflow into aquifers from phosphogypsum dumps; blue cluster—use of phosphogypsum in agriculture as an ameliorant and a component of fertilizer; and a purple cluster—the impact of phosphogypsum on microorganisms, particularly in bioremediation processes. Under the proposed integrated biochemical approach, the use of various bioprocesses of phosphogypsum recovery from waste dumps and implementation of new biotechnological solutions for processing phosphorus raw materials are presented.

The paper is focused on the research of the applied aspects of soil remediation, in particular the process of heavy metals (HM) binding and intensifying the cultivation of a soil microbiome using various organic-mineral compositions: biogenic composite, which is the product of anaerobic transformation of sewage sludge and phosphogypsum; organic-mineral compost, based on a mixture of phosphogypsum, superphosphate and cattle humus; and a combination of a mixture of sodium humate and superphosphate. The integration of theoretical and experimental principles in the synergy analysis of the interrelations in the system "objectsubject of research" in the study of the dynamics of changes in the forms of HM finding in the soil was carried out. The percentage content of the mobile forms of HM released by the extractant from their gross content before and after the treatment of the soil with organic-mineral compositions was determined with the spectrophotometric method using. The comparison of the soil processing efficiency was determined. Correlation relations of the dynamics in the biomass oxidative ability values for the soil biome and the rate of the substrate oxidation was proved over time treatment with different doses of the biocomposite with using of mathematical statistics methods.

The main problem of widespread introduction of magnetic water treatment (MWT) in the processes of water and wastewater treatment is the lack of modern research aimed at studying the mechanisms of MWT effects, in particular the influence on the physicochemical properties of aqueous solutions. This study explains the effect of MWT taking into account the physical and chemical properties of aqueous solutions due to the presence of the quantum differences in water molecules. All of the MWT effects are related to the change in the physicochemical properties of aqueous solutions. It is due to the presence of two types of water molecule isomers and their librational oscillations. The result of MWT is a violation of the synchronism of para-isomers vibrations, with the subsequent destruction of ice-like structures due to the receiving of energy from collisions with other water molecules (ortho-isomers). One of the most important MWT effects includes the change in the nature and speed of the physicochemical processes in aqueous solutions by increasing the number of more physically and chemically active ortho-isomers. The MWT parameters specified in the work allow explaining the nature of most MWT effects and require developing the scientific and methodological principles for the implementation of the MWT process and mathematical modeling of the MWT process in the water and wastewater treatment. It can be used in the design of the MWT devices taking into account the constructive and mode parameters of MWT devices.

The article discusses the issues of studying the effect of fine dust on human health using mathematical and statistical modeling. The initial data were statistical data on the volume of emissions of suspended particulate matter into the atmosphere and registered cases of diseases of the circulatory system among the population of Ukraine in 2012–2019. To assess the relationship between several factor signs was used method of correlation-regression analysis. The high connection between the actual statistical data and the data of the model calculation indicates the presence a very strong dependence the incidence of the circulatory system of the population on the emissions of fine dust. The obtained results of the study testify to the confirmation of the risk to the health and life of the population. The coefficients of determination make it possible to assert that the emissions of fine dust are one of the main reasons for the development of diseases of the circulatory system in humans. Among the types of dust that enters the atmospheric air from anthropogenic sources of emissions, the most dangerous type of dust for humans is dust containing solid particles ranging in size from 2.5 to 10 microns.

Abstract. This paper focuses on the study of the process of vertical migration of phosphogypsum components according to the soil profile. The qualitative and quantitative identification of main biogenic elements (phosphorus, sulphur, calcium etc) and heavy metals in lysimetric solutions from various horizons while getting on the surface of soil solutions containing phosphogypsum components is carried out by means of designed laboratory and experimental complex. The mineral hard soil fraction is also analysed. According to the results of the X-ray diffractometrical researches, the carbonates with heavy metals in their structure, caused by the ion-exchange with Са2+, were found in the mineral structure of the illuvial horizon soil samples. The results of experimental modeling indicate significant changes in the chemical parameters of groundwater, which are obtained by passing water with phosphogypsum particles on a model soil profile, which makes it easy to track the input data. In the upper part of the profile after 1 000 hours and for the first speed of the infiltration process, the constant moisture level was 25,6%, after the second speed of infiltration, it rose to 29.1 %. Noted that the highest concentration of biogenic elements (calcium, sulfur, potassium) was found in lysimetric solutions obtained from the humus and eluvial horizons. In addition, it is determined that iron is present up to 5 %, nickel -within the range of 1-3 %, and copper -up to 1 %. It should be noted that the biochemical transformations of silicon influence the fractional distribution of heavy metals, which can be fixed by sorption-sedimentation mechanisms in silica, oligo and polysilicon compounds, as well as in crystalline lattice structures of clay minerals, quartz, etc. The model of soil and geochemical situation was formed according to the soil profile under the influence of the phosphogypsum within the three-dimensional surface, developed with the help of the stochastic reconstructions based on the images of the scan electron microscopes.