Device for Water Disinfection by Ultraviolet Radiation

Abstract

To create a semiconductor portable device for disinfection of water with ultraviolet radiation, in this work, we studied the effect on microorganisms in an aqueous medium by ultraviolet radiation of a quartz lamp and semiconductor diodes with wavelengths of 365 nm and 275 nm. It was found that for all radiation sources in experimental studies, the dependences of the number of microorganisms in an aqueous medium on the irradiation time have a parabolic function. This is due to the fact that at the first stage of irradiation, the protective functions of the cells of microorganisms are turned off, then disinfection is carried out in proportion to the irradiation time. Complete disinfection of microorganisms in an aqueous medium was carried out with a quartz lamp in 5 minutes, a UV diode with a wavelength of 365 nm in 30 minutes, and a UV diode with a wavelength of 275 nm in 7 minutes.