It was shown that when disposing of complex chemical power sources (CCPS), they must be subjected to a preliminary discharge to a safe residual voltage of 1 V maximum. The data of foreign studies on the discharge of Lithium-Cobalt, Lithium-Nickel-Cobalt-Manganese and Lithium-Manganese batteries (LCO, NCM, LMO batteries, respectively) by various methods were analyzed. The results of experimental studies of battery discharges in NaCl 5, 10, 15 wt.% and Na₂CO₃ 10 wt.% solutions were presented. It was found that the discharge in saline solutions proceeds by electrolysis. It was confirmed that the use of Na₂CO₃ leads to the hydrolysis of carbonates. The graphs show the dependences of the discharge of various batteries on the discharge time and the hydrodynamic parameters of the agitator according to the Reynolds criterion (ReM). The composition of precipitation formed during the discharge of the battery was determined. Recommendations were developed on the regime parameters of mixing devices and the safe discharge procedure.

The experience of introducing circulating water systems, both in production processes and transportation, was presented. It was shown that circulating systems, for example, using flotation, can be effective when working with several reagents, including coagulants and flocculants. It was concluded that the obtained cleaning results meet the requirements for the quality of recycled water in the paint and varnish and galvanic industries, as well as in car washing. Promising development was highlighted through the introduction of such circulating systems using a modern range of reagents, small doses of which achieve high technological performance.

It was shown that high-density polyethylene (HDPE) contaminated with engine oil is effective as a reinforcing and modifying element in the asphalt cement concrete composition. It was found that shredded packaging materials with engine oil contamination in the amount of up to 17.5 % can be successfully used as raw materials in the production of asphalt-cement concrete mixtures. It was proven that the use of HDPE with bitumen increasesthe heat resistance of the mixture due to the formation of new physical and chemical bonds between them. It was demonstrated that the inclusion of of oil-contaminated container waste in the asphalt cement concrete has no adverse effect on living biological objects.

The impact of oil on soil microorganisms and watercress plants was assessed. Changes in the structure of the microbial community in oil-contaminated soils and morphological and physiological parameters of watercress plants are shown. It was revealed that high concentrations of oil in the soil lead to serious disturbances of the microbial community and inhibition of biochemical processes in plants, which is confirmed by the inhibition of the growth and development of watercress plants. However, low concentrations of petroleum oil, on the contrary, stimulate the growth of watercress plants. It is concluded that the presented experiments are necessary for the purpose of full and versatile testing of the toxicity of petroleum products on various living organisms and analysis of the nature of their responses.

The detoxifying ability of lowland peat humic acids at 10 to 110 mg/l concentration with respect to tetracycline, doxycycline, and cefotaxime was studied by bioanalysis on Escherichia coli K-802 strain. It was confirmed that, according to sensitivity to the presence of humic substances, the studied antibiotics were ranked as follows: cefotaxime > doxycycline > tetracycline. Humic acids were found to exhibit maximum detoxifying effect against cefotaxime in the entire concentration range. It was found that detoxification with respect to cefotaxime occurs mainly due to the binding of the antibiotic into non-toxic complexes, and for doxycycline and tetracycline – due to the inherent action of humic acids on the test object with a minimal contribution to binding. Enhancement of antimicrobial effect in the presence of humic acids above 60 mg/litre for tetracycline was recorded.

Catalytically active materials were obtained by processing the red mud of the Bogorodskoye field for the treatement of gas emissions from carbon monoxide. It was found that that the use of acid leaching followed by precipitation of sparingly soluble compounds with ammonium hydroxide leads to the production of materials with an iron content of 55% by weight according to elemental analysis. The samples were found to have higher specific surface area (154.8–155.7 m²/g) and porosity (0.275–0.311 cm³/g) and higher catalytic activity in the CO oxidation reaction compared to untreated red mud. It was confirmed that impregnation of the surface of refined products with copper oxide in the amount of 5 % by mass in terms of metal significantly increases the catalytic activity.

The efficiency results of synthetic mineralizers based on fluorite and graphite carbon for burning portland cement clinker were presented. Laboratory tests were carried out to obtain portland cement clinker using man-made alkaline mineralizers based on aluminum by-products. Physical and mechanical properties benchmark of test milling cements was carried out. Thermo-grav study results on individual raw slurry and sludge with a synthetic fluorite and graphitic carbon based mineralizers were presented. The oxidation of graphitic carbon in the composition of the mineralizer was analyzed.

The proposal concerns the use of native and modified sunflower husks for wastewater treatment from oil. It was found that acid and alkali modified at different temperatures increase the sorption properties of sunflower husk, and an increase in temperature and concentration of the substance during modification of the husk contributes to a decrease in the concentration of residual oil in model wastewater solutions treated with modified sunflower husk. It was found that the greatest removal of oil from model solutions of wastewater occurs when sunflower husk modified with 10 % sulfuric acid are used for treatment at 121 °C and and 1 atm. pressure. It was concluded that sunflower husk modified with acids and alkalis increases the degree of purification of oil-contaminated wastewater.

The modern issue of environmental safety of using nanotechnologies to increase the yield of vegetables was studied. The technology was developed for incorporating nanoparticles (NPs) of metal microelements into the composition of the nutrient medium to obtain planting material with improved morphophysiological properties, due to which the yield of crops when planted in the soil almost doubles. It was confirmed that the absence of disturbances in microelement composition of plant and fruit tissues, the unchanged content of mobile phases in the soil after harvesting testifies to the environmental safety of nanotechnologies in biocultivation of vegetables under aseptic conditions.

A study was made of the resistance of the biological properties of the main mountain and plain soils of the Crimea to gasoline pollution. It has been established that the soils of the Crimea differ significantly in the resistance of biological properties to gasoline pollution: the most stable are residual-calcareous and southern chernozems, and the least stable are brown forest acidic soils. It was revealed that the resistance of soils to gasoline pollution is determined by the structure and biological activity of the soil. It was determined that the allowable residual content of gasoline (PDOSB) in the soils of the Crimea varies from 0.45% (brown leached red-colored and incompletely developed chernozem) to 0.25% (brown forest acidic soil). It is recommended to use the value of EAPs for Crimean soils to assess and predict possible negative consequences when they are polluted with gasoline.

The paper sets forth a new method for determining emissions of pollutant during the life cycle of wind farms by aggregated data. The rationale for the use of aggregated data is given. Within the framework of method, an algorithm was developed for determining the emissions of CO₂eq, SO₂eq and PO₄eq in the production of elements of wind turbines and wind farms. Classification of elements of wind turbines by parameters and technical characteristics of elements with subsequent division into groups is given. Formulas for calculating emissions of pollutant at the stages of the wind farms life cycle are given and substantiated. Within the framework of the method testing, emissions of CO₂eq, SO₂eq and PO₄eq were calculated during the life cycle of two onshore wind farms with an installed capacity of 70 MW with wind turbines, differing in the parameters and technical characteristics of the elements. Calculated emissions of pollutants, which can be prevented when choosing the wind farms as power sources and determined the environmental effect of their use when comparing with thermal power plants.