Method of ultraviolet disinfection of water when growing fish in recirculating systems

Abstract

Among the methods of water disinfection when raising fish in closed recirculating systems, the most effective are technical approaches using ozonation, ultraviolet radiation in combination with other methods. The disadvantages of the ozonation method reduce its use, as excessive concentrations of ozone can cause serious damage to fish and can be harmful to those around them. Therefore, in the work, a reagent-free method of ultraviolet disinfection of water was used and an electrical disinfection system was developed. The experimental results obtained showed that disinfection of water in the pool using pre-filtration and UV irradiation ensures the inactivation of microorganisms: the total microbial count, total coliforms and E. coli (CFU/m3) do not exceed the permissible values. To implement the method of UV disinfection of water, a UV installation has been developed that provides an irradiance of 180 W/m2. For a pool with a water volume of 300m3, bacteriological purity of water is provided by a 480W unit.