Investigation of the kinetic patterns of waste drying poultry farms in order to further develop the technology of obtaining highly efficient organic fertilizer and feed for farm animals

The use of organic fertilizers from waste poultry farms can improve the properties of the soil, significantly increase their fertility, while growing environmentally friendly products. The work shows the need to process waste poultry farms into organic fertilizers by high-temperature drying. The features of the drying process of wet materials are determined, first of all, from the experimental kinetic curves of the process. Therefore, the goal was to study the kinetic patterns of drying chicken manure. The process of drying kinetics was studied in a dryer without convective movement of the drying agent in the working chamber of the dryer at a temperature of 150 °С and 220 °С. Fresh chicken manure with initial moisture content Wn = 72% was used as raw material. Based on the experimental data, the kinetic dependences of the drying process at different temperatures were constructed, from which the following conclusions were drawn: chicken droppings can be attributed to colloidal materials, as the drying temperature increases, the duration of the process is significantly reduced. The process of drying chicken manure at a temperature of 220 °С to a final moisture content of W = 10% lasts 3.75 hours, and at a temperature of 150 °С - 7 hours, which is 86% more in percentage terms at a temperature of 150 °С than at 220 °С. Changes in the nature of the kinetic curves on the dependence of the drying rate dW/dτ (%/s) on the moisture content W (%) can occur, not only because of the temperature difference, but also of changes in the thickness of the blown layer, the speed of the drying agent in the drying chamber, relative humidity of the drying agent. Therefore, to further build a mathematical model of the drying process for poultry farms waste, it is necessary to study the effect of all the listed parameters on the drying process. In the chicken litter, part of the moisture is in a free state, which can be mechanically separated in the field of centrifugal forces or by direct pressing on the press, which will shorten the process time and reduce energy costs.

сушка куриного помета, органические удобрения, коллоидные материалы, кинетические кривые сушки, скорость сушки, относительная влажность, равновесная влажность, форма связи влаги с материалом, drying chicken manure, organic fertilizers, colloidal materials, kinetic curves drying, drying speed, relative humidity, equilibrium moisture, the form of the connection of moisture with the material

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