Reducing the emission of odorous substances in industrial pig breeding enterprises
Pig-breeding enterprises are a source of intense odor pollution of atmospheric air. The enlargement of the existing complexes and construction of new ones leads to a significant exacerbation of the problem of odor pollution and numerous public complaints about the state of the environment. The current situation determines the high relevance and practical significance of research aimed at solving the problem of reducing the emission of odorous substances. The purpose of this work is the development of economically and environmentally reasonable technological solution to reduce odor pollution of the air by cleaning ventilation emissions, reducing the intensity of microbiological processes of manure decomposition and processing the corresponding waste into granular organic-mineral fertilizer. Experimental studies were performed in laboratory and production conditions. As a result of research, it was found that acidification of manure runoff with sulfuric acid to a pH of 4.5±0.2 can be an effective method for reducing the emission of odorous substances. Ventilation emissions can be cleaned by the reagent method directly in gas ducts due to the sequential irrigation of polluted air with dilute solutions of sulfuric acid and alkaline sodium hypochlorite (waste of chlorine production by the electrochemical method), followed by utilization of spent reagent solutions in manure. Based on the results obtained, a technological scheme for the processing of manure runoff into the NPK-glauconite-organic fertilizer with proportion of components 2.5:5.5:3.2-13-22 was developed. The planned result of introducing an appropriate technological solution into practice is to drastically reduce the amount of waste generated at pig-breeding enterprises, significantly reduce odor pollution and improve the environmental situation in the territories where they are located.