Experimental studies of obtaining biogas from waste of meat processing enterprises

Abstract

A promising direction for the development of gas supply systems in rural areas is the production and use of biogas. In the developed countries of the world, biogas production and use systems are widely used. The amount of biogas produced depends on the type and chemical composition of the feedstock. The aim of this work is to study the dependence of the specific yield and chemical composition of biogas on the type of substrate used and the temperature of biomass in the digester. Waste from meat processing enterprises was used as an initial substrate for research: technical fat; intestines; bird blood; pulp. Two temperature settings were chosen for the study: 38 ° C and 42 ° C. As a result of the studies, the values of the optimal duration of fermentation of the studied types of substrate were determined: bird blood - 21 days, pulp - 25 days, intestines - 25 days, technical fat - 40 days. It has been established that the maximum value of the specific yield of biogas is observed during the fermentation of technical fat - 1509.8 l / kg, and the smallest of bird blood - 833.4 l / kg. At the same time, the highest methane content is observed during fermentation of technical fat - 66%, and the smallest from bird blood - 53.5%. It was also found that the biogas yield at a fermentation temperature of 42 ° C is 7-8% higher than the biogas yield obtained at a temperature of 38 ° C.