Polozentseva V. The comprehensive assessment of the impact of wastewater storage and enhancement of ecological safety of dropping sewage waters from storage tanks

The Thesis for the PhD degree (candidate of engineering sciences in the specialty of 21.06. 01 – Environmental Safety. – Scientific Research Institution «Ukrainian Scientific Research Institute of Ecological Problems». Kharkiv, 2021. The dissertation is devoted to solving the scientific and practical problem of improving environmental safety of regulated discharge of industrial wastewater from storage tanks by determining the most environmentally friendly measures for the treatment of mine water, based on a comprehensive multifactor assessment of impact indicators and water quality criteria. The system approach to increase of ecological safety of regulated discharge of highly mineralized mine waters from reservoirs on the basis of the developed procedure of complex multifactor assessment of influences on water quality of surface water objects is theoretically substantiated. The proposed scientific approach makes it possible to assess whether there are statistically significant changes in water quality of the water body under the influence of wastewater discharge against the background of their natural fluctuations, and to determine the temporal and spatial parameters of this impact. This approach also allows to identify priority indicators of water quality, which are deteriorating, and to make an environmentally sound choice of priority measures to improve the environmental safety of industrial wastewater discharge. This procedure for comprehensive assessment of the impact of reservoirs on the quality of surface water bodies can be used by ATS developers when reviewing or updating the conditions of planned activities for the operation and reconstruction of reservoirs and specialists in conducting environmental audits. The methodological approaches provided by the developed procedure can be used by the specialists of the State Water Agency during the state monitoring of the surface water surface. A comprehensive assessment of the impact of discharge of highly mineralized mine water from storage ponds on water quality and water management on the example of the rivers Ingulets and Samara using the developed comprehensive assessment procedure, found that the stages of the procedure are interconnected and logically related. According to the results of choosing the priority regime of regulated discharge, the highest priority is given to the variant of the regime with extended autumn-winter discharge period of highly mineralized mine waters and health flushing in summer, which is ensured and meeting the requirements of agricultural water use in the lower areas during irrigation. The proposed approach can be used for different water management systems. The proposed approach can be used for different water management systems. Keywords: highly mineralized mine waters, regulated discharge, storage tanks, comprehensive impact assessment, comparison of hydrochemical data series, water quality, water use, expert-analytical procedure, measures to improve environmental safety.