This article presents an experimental setup for processing and increasing the efficiency of anaerobic treatment of liquid manure waste at large pig farming complexes, enterprises and farms where hydraulic manure removal systems are used. Such systems involve hydrodynamic effects on manure effluents by separating them into solid and liquid fractions using special devices such as a screw separator or separators for the treatment of liquid manure effluents. To optimize anaerobic fermentation, a design of a horizontal methane tank equipped with an additional mechanism is proposed. This mechanism provides hydrodynamic oscillations of the liquid by varying the velocity of the fermentable substrate in the working volume of the methane tank, fluctuations in the free surface level and changes in the hydrostatic pressure in the gas volume of the reactor. These effects promote improved anaerobic processing of the substrate by enabling more effective removal of sediment, preventing clogging, biofouling, and blockage of the reactor’s working zone. To identify key factors and parameters influencing the efficiency of anaerobic fermentation, a theoretical hydrodynamic study of the proposed upgraded methane tank design was conducted. Additionally, results from experimental research are presented, including indicators such as biogas yield per unit of loaded absolutely dry matter, degree of absolutely dry matter decomposition, ash content in sludge, as well as energy release and energy efficiency. These results demonstrate the completeness and adequacy of the anaerobic fermentation process in the upgraded methane tank with an additional mechanism for creating hydrodynamic disturbances during increased retention time of the substrate (up to 4 days), directly within the reactor.

Takhanov Mikhail P., Petrov Nikolay V.

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