The scheme of cooling tower operation with non-contact evaporative cooling technology is presented. A new design of the cooling tower sprinkler unit consisting of inclined-corrugated contact devices has been developed. The structure contains a system of pipes through which the flow of water moves without contacting the air. Studies have been carried out to determine the hydraulic resistance of inclined-corrugated contact elements with changes in air velocity and irrigation density. Thermal efficiency in a cooling tower with inclined-corrugated contact elements can reach 33 %.

The problems of reducing emissions of harmful substances by transport engines are considered. It has been established that the use of modified engine oil is an effective way to increase the environmental safety of transport engines. The effectiveness of additives to improve the backsize of motor oil and reduce harmful emissions in the exhaust gas was evaluated. Methods for feeding additives are proposed. Technical solutions for the use of additives for transport engines have been developed. Experimental studies are presented to assess the effect of modified engine oil on the environmental safety of an engine.

Problems and ways to reduce pressure fluctuations in the piping systems of power plants and production machines are considered. The theoretical foundations of vibration damping are described. The developed device designs are given to reduce pressure fluctuations in pipeline systems. Studied and experimentally tested their effectiveness in comparison with foreign counterparts. The use of designed and implemented dampers to reduce noise and vibration, increase the efficiency, reliability and service life of industrial equipment, prevent fire hazard.

The possibilities of using spent kieselguhr, modified with various substances as a sorbent for wastewater treatment from lead ions, were investigated. Modification of spent kieselguhr with solutions of sodium and potassium hydroxides, Trilon B, aluminum sulfate, oxalic, sulfuric, nitric and hydrochloric acids can increase its ability to remove lead during wastewater treatment. The greatest activity in the process of removing lead from wastewater was found in spent kieselguhr modified with sodium hydroxide, spent kieselguhr treated with Trilon B and ammonia is slightly less active.

A series of industrial experimental tests on the freeze treatment of colloidal sludge lignin precipitates was carried out under natural conditions. Changes in the physical and chemical properties of the precipitates were studied. It is established that three fractions are formed following the freeze treatment of colloidal sludge lignin precipitates, including demineralized water (up to 25 %), mineralized water (up to 15 %) and a restructured colloidal precipitate (up to 60 %). The total volume of the precipitate is shown to decrease to 40 %. Freezing precipitation of colloidal lignin slurry of "the Baikal Pulp and Paper Mill" leads to a decrease in toxicity from the third to the fifth class of danger. On the basis of frozen sediments, the lignin sludge of OJSC Baikal Pulp and Paper Mill with the addition of other waste from the Baikal region, a fertile soil was obtained that corresponds to GOST R 54651-2011 "Organic fertilizers on the basis of sewage sludge. Specifications".

The experience of the Arshanovsky coal pit in solving the problem of rational water disposal is presented. A wastewater and drainage water treatment system is proposed that can significantly reduce the content of suspended particles in clarified water discharged after settling and filtering – up to 1.5–5 mg/dm³, while the effect of water clarification is more than 95 % with a sharp decrease in the content of cyclic hydrocarbons and organics. In order to determine effective directions, in laboratory conditions, rational parameters of nozzle hydrodedusting were determined for varying degrees of water dispersion using treated wastewater and drainage water. It is established that the most effective mode of operation of the fine-dispersed irrigation system with a nozzle diameter of 1.0 mm. The obtained parameters of finely dispersed irrigation can be adapted for irrigation vehicles.

The results of processing satellite images of mining landscapes formed during the extraction and processing of diamond-containing ore are presented, the coefficients of self-restoration of vegetation cover are determined. It has been established that in the conditions of a sharply continental climate, transitioning to a subpolar one, at intensive rates of developing diamond deposits by an open method, all types of vegetation cover are slowly forming, which does not meet the requirements for restoring the ecological balance when conducting business with diamond mining enterprises.

The results of remote monitoring of the rates of restoration of vegetation cover are presented. It is concluded that for a full restoration of the ecological balance on the lands disturbed by mining operations, a long period of time will be required.

According to the results of processing satellite images of mining landscapes formed during the extraction and processing of diamond-containing ore, the coefficients of self-restoration of vegetation cover are determined. It has been established that in the mid-mountain and subpolar climate, at intensive rates of open-pit diamond mining, a very slow formation of all types of vegetation cover occurs, which does not meet the requirements of restoring the ecological balance when conducting business operations by diamond mining enterprises.

The results of remote monitoring of the ecological state of waste dumps and storages of processed diamond-bearing rock are presented. Low rates of restoration of vegetation cover at these objects of the mining landscape, formed during the development of kimberlite pipes, were revealed. To accelerate the restoration of vegetation on the territory of disturbed lands, a set of special works on technical and biological reclamation is proposed.

The results of expeditionary and laboratory studies of the radiation situation of 2001–2002 and dosimetry measurements of 2017 are presented. there are small radioactive spots. The radionuclide composition in the soil-vegetation cover of the impact zones of the underground nuclear explosion has been studied. Data obtained prior to the industrial development of the field are reperator for further radioecological research and can be used by subsoil users in the development of the area.

The plant and soil cover of the dumps of strongly metamorphic rocks of the Gorlovsky anthracite deposit (Novosibirsk region) has been studied. The link between calculated bonite points and the NDVI and SAVI research indices has been revealed. It has been established that the soilecological state of man-made landscapes, composed by highly metamorphic rocks, has a significant impact on the way of surface formation. It is shown that the young planned areas of dumping dense rocks are characterized by an unsatisfactory soil-environmental condition.

The article is devoted to the analysis of the electromagnetic radiation impact on biological objects, primarily on humans. The research of domestic and foreign scientists on the electromagnetic radiation dangers to humans, especially the work of American scientists and the data of US government official reports of the US government is considered. Key words: smartphones, electromagnetic radiation, effects on human health