Vibrations in engineering and technology

Baranovskyі Viktor – Doctor of Technical Sciences, Professor, Professor of the Department of Engineering of Machine Building Technologies, Faculty of Engineering of Machines, Structures and Technologies of Ternopil Ivan Puluj National Technical University.

Burlaka Serhii – Doctor of Philosophy in Industrial Engineering, Associate Professor, Associate Professor of the Department of Engineering Mechanics and Technological Processes in Agro-Industrial Complex at Vinnytsia National Agrarian University (3 Sonyachna St., Vinnytsia, 21008, Ukraine, e-mail: ipserhiy@gmail.com, https://orcid.org/0000-0002-4079-4867).

Boretska Tetiana – Head of the Scientific and Organizational Department of the Research Division at Vinnytsia National Agrarian University (3 Sonyachna St., Vinnytsia, Ukraine, 21008, e-mail: ipserhiy@gmail.com, https://orcid.org/0000-0002-7966-228X).

The article investigates the influence of ultraviolet (UV) lamps on the microbiological purity of animal feeds during the drying process. The aim of the work is to assess the effectiveness of UV radiation in destroying pathogenic microorganisms, such as bacteria (in particular Escherichia coli, Salmonella spp.), fungi and mold, which can negatively affect the quality of feeds and pose a risk to animal health. The experimental part of the study includes an analysis of the operation of low and medium pressure UV lamps in conveyor and vacuum dryers. The dependence of disinfection efficiency on such parameters as UV wavelength (in particular 254 nm and 365 nm), lamp power (from 15 to 150 W), irradiation duration (from 30 seconds to 5 minutes) and type of feed raw materials (grain, grass mixtures, compound feeds) was studied.

The results show that UV lamps with a wavelength of 254 nm provide a reduction in microbiological contamination by 95–98% under optimal exposure conditions (power 100 W, duration 3 minutes). However, it was found that excessive UV irradiation can lead to partial degradation of nutrients, in particular a decrease in the content of B vitamins and essential amino acids by 5–10%. To assess the nutritional value of feed after treatment, a chemical analysis of the content of proteins, fats and vitamins was carried out.

Based on the data obtained, recommendations were developed for optimal operating modes of UV lamps in dryers, which ensure a balance between microbiological safety and preservation of nutritional properties of feed. In particular, it was proposed to use medium-power UV lamps with short-term exposure in combination with controlled drying conditions (temperature 50–60°C, humidity 10–15%). The results of the study are of practical importance for improving feed production technologies in the agricultural industry, contributing to increasing their safety and quality.

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