The engineering problems of processing of rainfall in devices of new type – flotokombayna are considered. Pilot studies of process of condensation of suspension of active silt after secondary settlers in flotokombayna are conducted. Further dehydration is possible with use of the offered scheme of drying with the closed heat carrier contour. The scheme includes knot of preparation of the heat carrier, the drying camera, the device for unloading of a ready-made product, the system of cleaning of the fulfilled drying agent, knot of tertiary treatment of the fulfilled heat carrier, the double-circuit system of pneumotransport of a ready-made product. The offered scheme excludes hit of toxic substances of slimes to the environment.

A retrospective analysis of the modernization technology of production of primary aluminium in the Irkutsk aluminium smelter in the 55-year period of activity (1962–2017) and its implications for carcinogenic risk of polycyclic aromatic hydrocarbons and their indicator benzo(a)pyrene in the environments of the city of Shelekhov. Brief ecological and technological characteristics of the production, including the introduction of more advanced technology of baked anodes and "EcoSoderberg". The dynamics of the content of Benz(a)pyrene and its analogues in the air of the working area, the atmospheric air of the urban environment and the associated underlying surface of snow, soil and vegetation are estimated. The tendency of reduction of air pollution in comparison with depositing objects is revealed.

The problems of formation of toxic chlororganic compounds during waste incineration in the presence of organic and inorganic chlorine compounds are considered. It is shown that the radical mechanism of pyrolysis leads to different products with different composition of the initial substances. It was found that the greatest environmental danger is the joint burning of chlororganic and aromatic compounds. When burning polyvinyl chloride together with other polymeric materials, especially the aromatic structure, not only light chlororganic compounds are formed, but also highly toxic carbonyl chloride and chlor-furan. The formation of the above compounds represents a potential danger of further chemical conversions and the production of chlorinated dioxin compounds. It is proposed to prevent the formation of highly toxic compounds from the burning of polyvinyl chloride, its mandatory separation from the solid municipal waste stream and its separate processing by flameless methods.

The results of an experiment on cleaning oil-contaminated soil and accelerating the restoration of its fertility with the aid of combined biopreparations containing bacteria that degrade oil and microorganisms that can stimulate the growth and development of plants. It is shown that the introduction of bacterial mixtures reduced the oil content by 3.1–3.6 times and increased by 2-3 orders the number of basic physiological groups of soil microorganisms participating in its transformation, and also accelerated the germination of seeds (for 2 days) and the beginning (for 6–7 days) of all stages of oat development, used as a phytomeliorant. The most effective was a biopreparation consisting of a consortium of microorganisms Acinetobacter calcoaceticus IB DT-5.1/ 1 and Ochrobactrum intermedium IB DT-5.3/2 and strains of Pseudomonas koreensis IB-4 and Paenibacillus ehimensis IB 739, which, among other things, increased the mass of oat shoots in 2.3–2.6 times and their length is 54.0–77.8% compared to plants in the soil untreated with bacteria with oil.

The distribution of heavy metals in soils in the sorting station of Lublino-Sortirovochnoye Kursk direction of the Moscow railway in the southeastern district of Moscow with the help of sampling profiles is considered. Analysis of the distribution of metals in the northern, southern parks, the central line of the station and along the main course is given. The characteristic groups of metals that determine the nature and level of contamination of the station, as well as a number of predominant heavy metals are presented. Their distribution at three stations stopping at a distance from the main course is considered. The categories of soil contamination and the contribution of each metal are determined taking into account the halos of the dispersion of enterprises. A comparison of the soil of the sorting station with the level of contamination of the strip for the removal of segments of the railway lines of the Kursk and Kazan directions is given. Recommendations are given for reducing the content and distribution of heavy metals in urban areas.

Based on the results of processing satellite images with the delineation of boundaries and classes of mining industrial landscapes in the area of spent quarries and rock dumps, the self-healing coefficients of the vegetation cover in the range of 0.035–0.12 are determined. For all objects of the mining landscape with low values of self-regeneration coefficients of ecosystems, a set of special works on mining and biological reclamation of disturbed lands was recommended. It is established that in the conditions of the mountainous area of the Kuznetsk Ala-Tau, the processes of self-healing of the plant ecosystem are characterized by low rates of their flow in time and are ineffective from the viewpoint of restoring the ecological balance.

The mining landscape, represented by quarry excavations and external rock dumps, was investigated. Based on the results of remote monitoring, the rate of formation of a plant ecosystem at a level of 12.7 hectares per year has been established. The time period for the complete restoration of the vegetation cover can be no more than 20 years in the conditions of the mountain-taiga region of the Eastern Sayan. It was concluded for the first time that in carrying out special works on remediation of disturbed lands on the territory of spent quarries and rock dumps, there is no need.

The mining landscape, represented by quarry excavations and external rock dumps, was investigated. Based on the results of remote monitoring, the rate of formation of the plant ecosystem at a level of 10 ha per year has been established. The time period for the complete restoration of the mixed forest can be 80 years in the conditions of the mountain-taiga area of the Eastern Sayan. The conclusion is made that in order to accelerate the complete restoration of the forest ecosystem in the disturbed lands, it is necessary to carry out forest reclamation works.

Based on the results of processing satellite images with the delineation of boundaries and grades of mining industrial landscapes, environmentally acceptable selfhealing factors for vegetation cover at the level of 0.791 are established in the territory of railway dumps. The lower values of such coefficients in the range 0.049–0.48 are characterized by self-healing of the vegetation cover on the surface of automobile dumps.

The analysis of technical measures allowing to control the municipal solid waste disposal (MSW) landfill with the purpose of emission reduction at different stages of the life cycle is presented. The review of the latest research in the field of implementation of technical measures at the operational and aftercare period is conducted: controlled water infiltration, collection of biogas, aeration of the landfill body, installation of methane oxidation cover systems. It is substantiated that the choice of a technical measure for management of the disposal for MSW landfill should be carried out taking into account the ultimate goal: reduction of biogas and leachate emissions, acceleration of waste decomposition processes, reduction of the impact of the landfill on environmental objects at the aftercare period. Criteria for choosing technical measures for reduction biogas and leachate emissions, boundary conditions and peculiarities of their implementation at different stages of the life cycle of the landfill have been established.

The types of wastewater of a holiday house are considered. The necessity of disinfection of the treated domestic sewage at house before their soil recovery is substantiated. The methods of disinfection of treated holiday house drainage are described: chlorination, ozonizing, ultraviolet (UV) irradiation, and their essence is revealed. Their advantages and disadvantages are listed. A comparative ecological characterization of the indicated methods of disinfection of sewage is given. Factors influencing the efficiency of disinfection of wastewater by these methods and on the economic indicators of processes are indicated. As a result of the environmental and economic evaluation of disinfection methods, a conclusion has been made in favor of the prospect of applying the UV irradiation method for disinfection of the treated wastewater from a holiday house.

The level of soil pollution is equated with high risk, which leads to irreversible changes in its physical and chemical composition, and to the high cost of soil remediation. The company (in this paper we consider the chemical and petrochemical cluster) are not responsible for environmental damage and do not implement measures to restore the soil cover. Another problem is the lack of exhaust mechanism for calculating the ecological and economic damage. An evaluation mechanism for calculating the environmental and economic consequences of soil contamination is presented.

On the example of the Irkutsk oblast, the problem of air pollution with technogenic and natural fires is considered. The factual basis of the study was the statistics of the consequences of fires in residential, public, industrial and other objects of the technosphere and natural fires, also combustion of forest combustible materials in the residential, landscape-recreational, forest-park, suburban zones of cities and settlements for 2011-2016. On the basis of existing approaches, qualitative and quantitative indicators of burned materials are determined as a result of technogenic and natural fires, ignition, and specific indicators of toxicant emissions in the combustion of various types of materials, which allowed to comprehensively determine the gross emissions of pollutants in the Irkutsk oblast. It is established that as a result of technogenic and natural fires, ignitions, the annual gross emissions of pollutants averaged about 18.2% of the mass of stationary sources of pollution in the oblast.