The article deals with the research of possible methods of dehydration of organomineral fertilizers based on liquid waste of pig farms. Technologies and various methods of sludge dewatering after reagent treatment of liquid waste from pig farms and related processes are analyzed. Based on the results of the analysis, a comprehensive scheme is proposed that can meet the needs of processing waste from large pig farms and provide farmers with a sufficient amount of available fertilizers. The dependences of the dynamics of moisture removal and dewatering on the devices used are obtained. It is established that the productivity of aggregate operations for the removal of excess liquid at the first stage and dehydration of organomineral fertilizers can be expressed in qualitative indicators — different structure of the final product-organomineral fertilizer in the form of powder, granules or plastic mass. The interaction between individual operations in the technological chain is considered, the technical indicators of various scenarios of dehydration of organomineral fertilizers are analyzed.

This paper aims to analyze effective approaches to waste management in agro-industrial cluster. It considers the studies confirming the relevance and importance of the development of technologies for processing and recycling of waste from the agro-industrial cluster, and, in particular, waste from pig farms. The methods of system analysis, information synthesis, statistical data analysis were used to identify the existing problems. The period from 2000 to 2020 was considered. The most popular directions and production branches have been identified. Quantitative analysis of scientific works on recycling and disposal of waste of agro-industrial cluster was carried out. Based on the data obtained, graphs were built, comparisons were made, conclusions were drawn about the demand for the development of resource-saving technologies, and waste recycling. Based on the analysis of the existing approaches, the authors proposed a cluster form of organization and waste management.