Details

The topic of the of the master’s thesis is “Disinfecting effect of ultraviolet LEDs.” The goal of the work: to study the disinfecting effect of UV diodes on water in a pilot installation. The following tasks were set for the study: 1. Conduct an analytical review of modern scientific, technical, regulatory, and methodological literature on methods of disinfecting drinking water and the bactericidal effect of ultraviolet radiation from diodes. 2. Conduct experiments on the inactivation of E. coli bacteria when exposed to ultraviolet radiation with selected diodes on the surface of the agar and in water layer to confirm the disinfecting properties of the diodes declared by manufacturer. 3. Compare the obtained results with manufacturer data. The bacterial culture was cultivated with assistance of the Center for Collective Use "Analytical Center for Nano- and Biotechnologies of St. Petersburg Polytechnic University". The graphs were done describing the number of cells (N) of a model microorganism that survived after UVR treatment depending on the (I) intensity of treatment and initial concentration of bacteria before treatment. The results obtained were compared with literature data on other UV installations with diodes, and the doses of disinfectant radiation when using UV from LEDs were determined.