Assessment the effectiveness of disinfection of household wastewater using a UV complex under experimental conditions

Abstract

Introduction. One of the most effective and economically justified methods of inactivation water treatment is disinfection using UV irradiation. UV disinfection is characterized by the absence of an aftereffect, which is an undeniable advantage for wastewater treatment, since adverse environmental effects on the wastewater receiving water body are excluded. The main technological parameter that ensures proper disinfection is the UV dose. The purpose of the study is the confirmation of the effectiveness of using the technology of UV disinfection of water with a dose of at least 30 mJ/cm2 in relation to sanitary-indicative and pathogenic microorganisms that are present in the wastewater of the Moscow metropolis. Materials and methods. UV disinfection units DUV-1-87-N were used to conduct the experiment, providing a UV dose of at least 30 mJ/cm2 for water disinfection and an open UV irradiator SVETOLIT 50 for air disinfection manufactured by company LIT. Results. The use of a UV dose of at least 30 mJ/cm2 for disinfection of water with a high degree of contamination of microorganisms ensures the level of contamination of microorganisms to meet the requirements of sanitary legislation in force on the territory of the Russian Federation for disinfected wastewater allowed discharging into surface waters. Limitations. The limitations of the study are related to the equipment used for applying UV irradiation, water turbidity, and the sensitivity of microorganisms of different taxonomic groups to UV irradiation. Conclusion. The results of the conducted experimental study can serve a justification for the UV radiation dose of 30 mJ/cm2 used for effective disinfection of viral and bacterial contamination of water with high levels of microbial contamination up to the standard permissible level of microbial contamination (in accordance with SanPiN 1.2.3685-21) of treated wastewater suitable for discharge into surface waters.