The recultivation of landfills is one of the main tasks in ensuring the environmental safety of urbanized areas. The waste of old landfills contains mainly soil-like material. The contamination of soil-like materials is uneven, but the level of contamination in some parts can be within acceptable limits. If there is no contamination or if the contamination levels are considered acceptable, the material can be utilized as soil for recultivation. This study aims to evaluate the fertility of soil-like material from landfills. The parameters used to characterize fertility were the content of humus and mobile forms of nitrogen, phosphorus, and sulfur, as well as potassium, calcium, magnesium, and pH value. The samples of soil-like material were collected in November 2021 at a landfill located in the Voroshilovsky district of Volgograd at a depth of greater than 2.5 m, where there was no or low contamination. The soil-like materials are rich in humus and nutrients. However, they contain an average amount of magnesium. This indicates the fertile potential of the material and the possibility of its use as fertile soil during recultivation. The slightly alkaline environment, high potassium content, and mobile sulfur in soil-like materials necessitate the development of measures to normalize these indicators and select plants for phytoremediation.

Keywords: landfill, soil-like material, fertility, environmental safety, humus, nitrogen, phosphorus, potassium

The article presents the study results of a soil-like fraction contamination at a landfill located on the territory of the Traktorozavodsky district of Volgograd with heavy metals. The soil-like fraction's pollution level was assessed using a cumulative chemical pollution index (Zc) and its modifications. It was determined that the contamination levels with heavy metals are dependent on a used cumulative chemical pollution index modification. The use of the average geometric values of a cumulative chemical pollution index (Zc) is preferred for a pollution assessment of a soil-like fraction. Because the pollution level of a studied soil-like fraction was assessed as hazardous, its use as a recultivation material can only be permitted after a detoxification.The main pollutants in the soil-like fraction are cadmium, copper, and nickel.

Keywords: landfills, soil-like fraction, heavy metals, pollution level

This paper discusses the results of engineering and environmental surveys on the territory of an unauthorized landfill near the working village of Erzovka, Gorodishchensky district, Volgograd region. In the course of the work, a comprehensive study of the state of atmospheric air, soil and radiation background was carried out. In accordance with the order of the Ministry of Natural Resources and Environment of the Russian Federation dated August 4, 2017 No. 435 "On the approval of the criteria and term for categorizing objects, the accumulated damage to the environment on which is subject to liquidation as a matter of priority", the study area was categorized. The data on the mass, morphological composition and hazard class of wastes located in the study area are presented. The results of a laboratory study of environmental pollution by production and consumption wastes are presented, and the accumulated environmental harm is assessed.

Keywords: unauthorized landfill, accumulated environmental damage, production and consumption waste, pollutants, heavy metal pollution, level of negative impact

This article presents the results of the study of pollution of components of the natural environment (air, soil, water) and wastes located in the territory of the landfill near the village of Samofalovka, Volgograd region, and carried out an assessment of the accumulated environmental damage.

Keywords: Landfill, accumulated environmental damage, pollutants, exposure level

This article discusses the use of waste disposal technologies, their technological and environmental-economic assessment. The relevance of this work is determined by the current trend on finding affordable and effective technologies for waste disposal, taking into account their energy potential. A comparative analysis of existing technologies for waste treatment and a feasibility study on the utilization of organic and inorganic carbon-containing waste by the pyrolysis method have been carried out. The authors analyzed the Russian and foreign experience of using waste technologies as alternative energy sources. The energy component of production and consumption wastes is considered. The scheme of the production complex using the pyrolysis technology, focused not only on the processing of waste, but also obtaining the sought-after useful competitive product.

Keywords: ecology, pyrolysis technology, waste recycling, municipal solid waste, MSW, biofuel

This paper discusses the current problems of waste management: sorting and their further processing. The average morphological composition of waste in Russia and in the world is presented. Possible methods of recycling waste components on different morphological composition are considered. A comparative analysis of the existing promising technologies for processing waste used in the Russian Federation, including municipal solid waste by burning, pyrolysis and plasma gasification, from the point of view on economic and environmental efficiency of the process. The technical and economic features of the low- and high-temperature pyrolysis process are given. As economic indicators used are specific capital investments, the cost of utilization, energy consumption and production recoupment. The assessment of environmental efficiency is determined by indicators such as the degree and duration of waste disposal, the generation of waste in the recycling process, and the pollution in the soil, groundwater, and the atmosphere.

Keywords: ecology, pyrolysis, waste treatment, municipal solid waste, solid waste, recycling, waste management