The current state of the environment defines a new conceptual vision of the development of the economy of the future, suggesting a transition from a linear production model to a closed-cycle model, which makes it possible to fundamentally change the proportional dependence of production waste on production volume growth. Solutions to this task lie in the plane of the integrated use of resources, reducing the mass of recyclable production waste, their repeated (multiple) use or return to production through the allocation of useful fractions and disposal of irretrievable waste. Thus, waste recycling, as a component of a waste management system, can be considered as the most important, necessary, essential, inalienable property of the fourth industrial revolution. According to the Antimonopoly Committee of Ukraine in 2016-2017 no more than 5.8% (2.8 million m 3 or 638 thousand tons) of garbage was received for recycling, of which 2.7% was utilized by thermal

An attempt was made to estimate the annual production of CH4 at a municipal waste landfill site in Poland. As a matter of fact, the extent of the unorganized emission of CH4 from the landfill surface was approached based on the adopted mathematical model. The Ward agglomeration method for cluster analysis and the Pearson coefficient were employed to evaluate the distance-based similarity measure and to optimize methods for estimating methane emissions from a landfill as well as to verify the input parameters for the model. In order to calculate the content of biodegradable organic parts in the waste, morphological tests of the landfilled waste were performed. Physical quantities, measurements and the actual amount of the landfilled waste as well as the volume of CH4 neutralized in a collective flare were implemented in the model, respectively. The model-based findings and experimental outcome demonstrated stable gas production in the landfill with a high CH4 content. On the other hand, a rather low efficiency of the landfill passive degassing installation indicated the necessity to design and develop its active counterpart with the prospective application of the generated biogas for energy production in a cogeneration system.

The issue of waste accumulation has become one of the global problems of humanity. In Ukraine, the main method of waste management is landfill depositing, which is unproductive and affects the ecosystem negatively. However, large landfill sites should be used to produce biogas, thereby reducing the environmental burden and the earned revenue should be used to introduce recycling and a gradual transition to a European waste management policy. The aim of our study was to investigate the state of waste recycling and the possibility of using waste landfills and food with lost consumptive qualities for biogas generation. To analyze the economic efficiency of the installation of biogas equipment in landfills and to investigate the current state of waste management in Ukraine. The research demonstrates that at present in Ukraine the problem of waste accumulation becomes actual. At the same time, the number of large waste landfills is increasing. It is proved that at landfills with an area of more than 50 hectares, the installation of biogas equipment is cost-effective, and the raw material can be distributed at the feed-in tariff, thus solving the energy problem.

Selection of a waste management strategy for a region is a difficult decision that must take into account various frequently contradictory targets and tasks. This article presents the use of a multi-criteria analysis for estimating and selecting the most profitable selection of a regional-metropolitan waste management system. The final solution should take ecological, economic and social aspects into consideration. It was established that the solutions chosen needed to ensure the following: waste stream reduction, social acceptance, and a profitable economic efficiency index.

The methodology of modelling and object analysis of management systems includes, inter alia, operations connected with the definition of special object types being an imitation of components (objects-sources of waste generation, objects for waste neutralisation, networks of roads, natural environment components, waste substances, etc.) [4, 6-7]. Since the systems are investigated in the GIS technology, some objects are assigned attributes of spatial representation (location coordinates, geometric and graphic attributes used for their recording on a map). Operations performed on the models of individual-class objects (e.g. topological operations) are interpreted (using object-related terminology) as the so-called methods (functions and procedures) which are in fact computer implementations of a range of algorithms used in system analyses