UV light disinfection of air and water

The widespread use of UV disinfection technology for air and water is currently based on a drastic increase in the power and lifetime of UV lamps with electric discharge in mixtures of argon-neon and mercury vapor at low pressure. The improvement of lamps occurred after studies of in electric discharge effect on the electrodes and quartz walls. Increasing the power of UV lamps to 300-350 W with an efficiency of 254 nm UV line generation of about 35% made it possible to create equipment for water disinfection. Increasing the power of UV lamps to 600-1000 W made it possible to create the plant for wastewater disinfection in Moscow with a record consumption of 4.2 million cubic meters daily. Disinfection of air and surfaces has become increasingly important recently, as the number of infected patients inside hospitals is constantly increasing. To disinfect air and surfaces, special high-power UV lamps were created for open irradiators, closed irradiators (recirculators) and for air conditioning and ventilation systems. Since the recommended UV doses for covid 19 are several times higher than for Staphylococcus aureus, for which they were designed, not all equipment can be used effectively now. Individual small-sized devices with a low-power UV lamp of several Watts are needed to dis