Investigation in process of fermentation medium mixing in bioreactor
2017
Marchenko, V., Stavropol State Agrarian Univ. (Russian Federation) | Sorokin, A., Kalmyk Research Inst. of Agriculture named after M. B. Narmaeva, Elista (Russian Federation) | Sidelnikov, D., Stavropol State Agrarian Univ. (Russian Federation) | Panasenko, A., Stavropol State Agrarian Univ. (Russian Federation)
The research of the specialists indicates that a promising direction of development of processing poultry droppings is the creation of low-waste or totally non-waste resource-saving production. It is based on the method of anaerobic fermentation of poultry droppings in bioreactors. One of the unsolved questions of bioreactor operation is the mixing process of fermentable substrate for the purpose to intensify the heat exchange in the amount of fermentation, because the performance of bioreactors depends on it. To study this process, we used the vertical bioreactor with an anchor stirrer, which is a classic example of the laboratory equipment in the study of intensification of heat exchange in viscous medium. It was found that the intensification of heat exchange in the fermentation medium is possible by replacing the free movement on its forced motion. And this movement is necessary to create within the thermal boundary layer that determines the laws of heat exchange. Criterion equation was obtained describing the heat exchange process, regardless of the mixing method. It was revealed that the motion condition of fermentation medium is characterized by the value of the Reynolds number. The number was determined characterizing the mixing intensity, which estimates the intensity of the mixing properties of the fermentation medium and constructive form of the bioreactor. We derived the equation of the heat exchange process operating at the forced motion of the fermentation medium in the boundary layer. The factors influencing on the heat exchange process in fermented poultry droppings. The performance of anaerobic bacteria are studied under the optimal intensification conditions of the mixing process of fermentation medium at the optimum concentration values of the dry organic substance and the fermentation temperature.
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