The use of low-temperature plasma in the processes of inactivation of the bedding material

The article presents the results of a study on the inactivation of microorganisms on contaminated bedding material made from plant raw materials used in poultry houses. The purpose of the study was to substantiate rational modes of operation of the plasma torch (a low-temperature plasma generator) providing for the effective inactivation of the bedding material. The source of low-temperature nonequilibrium plasma is an electric spark discharge of alternating current at atmospheric pressure. The structural diagram of a plasma torch and the methods for its adaptation for assessing the level of impact on microorganisms of electromagnetic radiation and chemical compounds formed during an electric spark discharge are described. The main characteristics of the installation for generating low-temperature nonequilibrium plasma are presented, and a study of the flux density of electromagnetic radiation was conducted. The following parameters were measured: the electromagnetic radiation flux density, the processing time of the bedding material, the plasma-forming gas characteristics (temperature, humidity, pressure, etc.), the number of positive and negative aero ions, the concentration of ozone and nitrogen oxides. The controlled parameter was the concentration of free radicals (OH•, O•, H•). For the qualitative and quantitative assessment of the concentration of chemical substances, the radiation spectra of low-temperature nonequilibrium plasma in the UV range of 600–1500 THz were studied. The results of the impact of electromagnetic radiation and active chemicals on pathogenic microorganisms in the bedding material are presented. To determine the most energy-efficient operating mode of the low-temperature nonequilibrium plasma generation unit, experiments were conducted on the inactivation of microorganisms using streamer and torch discharges on various surfaces used as a base for the bedding material.

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