Diseño y construcción de un prototipo de esterilización empleando radiación UV-C para alimentos industrializados
This degree paperwork presents the stages involved in the design and construction process of a sterilization prototype that uses ultraviolet radiation sources at 253.7 nm (UV-C), from the establishment of theoretical and developmental foundations based on the review of works related to the subject o...
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| Médium: | bachelorThesis |
| Jazyk: | spa |
| Vydáno: |
2023
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| Témata: | |
| On-line přístup: | https://dspace.unl.edu.ec/jspui/handle/123456789/26072 |
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Přidat tag | Shrnutí: | This degree paperwork presents the stages involved in the design and construction process of a sterilization prototype that uses ultraviolet radiation sources at 253.7 nm (UV-C), from the establishment of theoretical and developmental foundations based on the review of works related to the subject of ultraviolet technology and its effects on pathogens. Among the theoretical foundations, we can find mainly the UV dose, UV intensity, and exposure time. We based the selection of the necessary UV dose in the first instance on the categorization of the materials with which they make industrialized food containers, followed by the analysis of the pathogen population prone to develop in each. With the pathogens identified, we determined an exposure time where we considered the UV intensity provided by the radiation sources. The sizing of the prototype essentially involved taking measurements of typical industrialized foods offered in a supermarket and the characteristics of a suitable UV radiation source. Additionally, the developed design incorporates easy coupling of parts for easy assembly and disassembly, which is convenient in the execution of periodic maintenance. For the frame of the device, we used stainless steel as the most relevant material, in addition to glass and plastic (PLA) for some specialized parts; regarding the structure, it is composed of two compartments for sterilization and a control unit correspondingly. Due to its characteristics, an SBC board called Raspberry Pi 3 in its B version was implemented as the core of the system, which greatly facilitated the incorporation of practical elements, such as a touch screen. Finally, to verify the scope of the device concerning the generation and application of the necessary dose to the products, devices specialized in ultraviolet radiation were used (UV radiometer), and the development of toxic gases was also measured (ozone meter). The results obtained, under the calculations made and considerations involved, show the generation of a dose whose levels are equal to or higher than those necessary to inactivate the target pathogens depending on the working mode in which the device operates, thus fulfilling the objectives proposed at the beginning. Keywords: Industrialized food, food contamination, ultraviolet radiation, food sterilization. |
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