INTENSIFICATION OF WATER PURIFICATION PROCESSES FROM CHEMICAL AND BIOLOGICAL CONTAMINATIONS BY CAVITATION TREATMENT

Abstract

The results of a theoretical and experimental study of the effect of cavitation treatment of natural and drinking water on its disinfection from biological contaminants are presented. It was established that hydrodynamic cavitation treatment of natural water for 8-10 minutes contributes to the inactivation of pathogenic flora of this water. In particular, it reduces the content of enterococci in it by 25-30%, reduces the content of lactose-positive E. coli in water samples by 75-80%, and also reduces the content of E. coli by 90%.

It has been proven that cavitation disinfection of natural water is capable of inactivating a significant number of varieties of microorganisms present in it, as well as reducing the total microbial number by 25-30%, and reducing the number of harmful Echerichia coli and Str. Faecalis,

The calculated rates of destruction of organic compounds (80%-85%) in natural waters confirm the feasibility of using cavitation for water purification processes. For cavitation water treatment in domestic conditions, a design scheme of a vibrational vibro-resonant low-frequency cavitator, which belongs to the cohort of devices for hydrodynamic cavitation treatment of liquids, has been proposed. The volume of its tank for filling with treated drinking water is about 100 liters. The optimal vibration modes of its disk cavitation agitators, which are within the oscillation frequency of 37-40 Hz and the oscillation amplitude of 0.5-0.75 mm, have been experimentally determined.

This cavitation device for disinfecting drinking water is capable of providing its treatment both discretely with a capacity of 100 liters of water for 10 minutes of continuous operation, and in the mode of continuous supply of drinking water for disinfection treatment with a capacity of 60 l/h. The vibration drive of this household cleaning device is powered by a standard electrical network with a voltage of 220 V.