Full-scale experimental studies of the process of introducing livestock effluents into the suction pipelines of pumping stations for fertilizing irrigation

Purpose: to determine the possible degree of mixing livestock effluents and water for various hydraulic parameters of elements of installed equipment and pipeline network. Materials and methods. The research was carried out at the pumping station of the irrigation system of “Rassvet” LLC of Kuibyshev district Rostov region. The diagrams show pumping stations with positive and negative suction heads for the possibility of universal use of the obtained parameters regardless of the water marks in both the water source and the outlet. When conducting full-scale studies, the theory of experiment planning was used. The general, maximum possible geometric and hydraulic parameters of the fertilizer and water jet mixer network for centrifugal pumps are assigned. Results. When analyzing the equations obtained experimentally, the dependences affecting the hydraulic process of introducing livestock effluents into the suction pipelines of the pumping station are obtained. With an increase in the water level in the water source from minus 1.5 to plus 0.5 m; the manure storage level from 0.5 to 10.0 m and the mixer head from 0 to 8.0 m, the mixing coefficient increases from 1.0 to 3.0, respectively; the mixing coefficient and accordingly, the amount of nutrients in the irrigation mixture is calculated based on the above parameters. Conclusions: the conducted studies make it possible to determine the necessary mixing coefficient of livestock effluents and water when introducing the mixture into the suction pipeline of the pumping station, to calculate both the one-time and annual supply of nutrients during fertilizing irrigation with livestock effluents for the expected yield.