Introduction. Mathematical modeling is an important stage of scientific research, because it allows you to imagine the physics of the process occurring in a particular object. The most accurate and complete model helps to simplify the process of analyzing the dynamic characteristics of a physical phenomenon or process occurring in the object of study, subject to verification for adequacy to the real process [1]. The expediency of mathematical modeling is due to the high cost of conducting experiments on a real biogas production unit (bioreactor). , subject to the need for its design and manufacture, and significant time costs, due to the high inertia of a number of processes, on the example of obtaining biogas from various agricultural wastes by anaerobic fermentation in the bioreactor, due to the large overall dimensions of the installation.

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