STUDY OF THE INFLUENCE OF THE MIXING RATE OF AGRO-INDUSTRIAL WASTE ON THE AMOUNT OF PRODUCED BIOGAS

Abstract

At the enterprises of the agro-industrial complex there is a large amount of waste, most of which is not recycled. This leads to a number of environmental problems, such as soil acidification and the greenhouse effect caused by methane emissions into the atmosphere. Meanwhile, waste from the agro-industrial complex (AIC) is an excellent raw material for the production of biogas, an environmentally friendly fuel that agribusiness enterprises can use for their own generation of heat and electricity, thus reducing the volume of energy purchases from generating companies. In addition to heat and electricity, biogas technologies make it possible to obtain high-quality fertilizers, which agricultural enterprises can later use, for example, for growing greenhouse cropsIn this paper, we studied the effect of the waste mixing rate in a bioreactor on the amount of biogas produced. The studies were carried out at the following mixing speeds: 40, 70 and 100 rpm. The research results showed that at a speed of 70 rpm, the most efficient mixing of the biomass in the reactor is observed. At a stirrer speed of 40 rpm, the presence of dead zones was observed in the reactor, which indicates a low efficiency of biomass mixing. In addition, at a stirrer speed of 70 rpm, the maximum daily production of biogas is observed, namely 1100 l. At a stirrer speed of 100 rpm, a noticeable reduction in the amount of biogas produced was observed due to the high mixing intensity. In general, in the studied time period (17 days), at mixing speeds of 40, 70 and 100 rpm, 9800, 10400 and 8000 liters of gas are produced, respectively. Thus, the highest performance of the bioreactor is achieved at a biomass stirring speed of 70 rpm.