BACTERICIDAL DISORDERS OF WATER IN BASES OF COMPLEX ACTION OF OZONE AND UV-RADIATION
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Abstract
In this work an analysis of the results of research on bactericidal decontamination of water in the basins with the use of various technologies has been carried out. The benefits of using ultraviolet radiation and ozone are shown. Ultraviolet does not create side-effects of disinfection. Influence of ultraviolet radiation on viruses is much stronger than in the case of use. The peculiarity of ozone is the ease of its decay with the formation of atomic oxygen - one of the strongest oxidants. Atomic oxygen destroys bacteria, spores, viruses, destroys organic substances dissolved in water. This allows the use of ozone not only for decontamination, but also for the removal of toxic organic substances. The task was to create a bactericidal disinfection device in the pool using ultraviolet lamps and ozone, which is formed by short-wave radiation of these lamps. The article describes the design of the developed installation and the results of its testing in a pool of 75 m3. The installation is a cylindrical chamber with an internal diameter of 90 mm and a length of 950 mm, in which the ultraviolet lamp in the quartz cover is located along the chassis axis. The diameter of the lamp is 19 mm, the diameter of the cover is 30 mm, the thickness of the wall is 1.2 mm. With such a design, through the water layer circulating through the chamber, almost all the ultraviolet flow passes. Ozone formed in the air space between the lamp and the walls of the quartz cover, is fed into the water using an ejector. The thickness of the water layer under ultraviolet irradiation with a dose of 25 J/m2 is 30 mm. The amount of ozone formed in the air, which circulates through a quartz cover, provides additional ozonation of water at a dose of 0.1 g/m3. The residual concentration of ozone entering the pool with disinfected water does not exceed 0.015 g/m3. Bacteriological studies of water in the basin have established that ultraviolet decontamination without ozonation does not meet the requirements of DIN 19643-1 according to the general microbiological number of CFU/cm3. At additional ozonation, the CFU does not exceed 20 CFU/cm3. With constant water circulation, two ultraviolet disinfection units with a capacity of 8 m3/h and an additional dose of 0.1 g/m3 of ozone in a pool of 75 m3 provide normative bacteriological parameters.
Keywords: ultraviolet radiation, ozone, bactericidal decontamination, water, swimming pool.
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