Chernysh Y. Scientific basis of environmental synergetic approach to phosphogypsum recycling to reduce manmade load on environment

The thesis deals with the solution of scientific-applied issue of reducing the manmade impact on the environment of waste dumps of chemical industry. The environmental synergetic approach reducing the manmade impact on the territories adjacent to urban ecosystems has been developed to determine the synergistic effects of accumulation and storage of phosphogypsum arrays. The environmental synergetic basis for modeling of phosphogypsum dumps effect on the environment components has been formed. In particular, the scientific basis for estimation of manmade impact of phosphogypsum accumulation on an ecosystem and heavy metals (HM) migration from a man-made dump to a soil complex of an edaphotop has been developed. The scientific basis of flow diagrams of phosphogypsum dumps recycling in biodesulfurization systems of gas flows with material flows recycling has been developed. They promote a new direction of phosphogypsum application in the atmospheric air protection technologies with the formation of environmentally safe processing technologies and the production of useful recycling products based on the environmental synergistic processes of immobilization sorption on phosphogypsum carrier. To increase the environmental safety of wastewater treatment plants the recycling of phosphogypsum in the anaerobic stabilization systems of wastewater and sludge sediments (SS) in order to intensify dephosphatation has been substantiated. Environmental synergistic mechanisms of phosphate and SS removal from effluents are determined at phosphogypsum processing in the protection systems of aquatic ecosystems. The environmental synergistic mechanisms of biocomposite influence in the system “soil – microbial biome – toxicant” has been investigated to increase environmental safety of natural and anthropogenic landscapes contaminated with HM. A number of sacrificial transformations were identified that determine long-term fixation of HM in stable insoluble structures. Mathematical modelling of the biocomposite effect as a product of anaerobic conversion of SS and phosphogypsum on the soil protective functions has been carried out and, accordingly, the environmental and synergetic model of its influence on the natural regulation process of the buffer properties of the soil complex has been developed.