SHORT-TERM ACOUSTIC WATER TREATMENT

Purpose. To investigate the process of treatment of different waters with short-term action of acoustic cavitation and to establish the expediency of simultaneous bubbling of different gases into the reaction medium and cavitation. Methodology. The duration of the disaggregation process during the processing of the model medium is 2–3 minutes, while for natural water – 30 minutes. The number of microorganisms (NM) before and after the experiments was determined by counting the colonies that grew on the Petri dishes. For the research we used a model medium based on distilled water with the addition of bacillary cells and natural water. The model environment was exposed to gases of different nature and acoustic cavitation, and natural water was treated only by cavitation. Results. It was found that the process of water purification consists of two processes: the accumulation of microbial counts caused by the destruction of microbial aggregates and the reduction of microbial counts caused by the destruction of microbial cells. Such stages are revealed both at acoustic processing of the microbic water formed on the basis of disaerated distilled water, and natural. It has been experimentally shown that the use of bubbling gases accelerates the disaggregation process by almost 10 times. The proposed method of treatment of different waters with short-term exposure allowed to detect the process of disaggregation of microbial cells with their subsequent destruction in the aqueous medium and to achieve a high degree of water disinfection. Originality. The article proposes the supply of gases of different nature in the reaction medium for disinfection of water from bacteria under cavitation. It has been proven that gas supply during the first three minutes of the process accelerates the breakdown of aggregate aggregates in the aquatic environment under acoustic conditions, which is associated with the formation of additional cavitation nuclei, compared to the process in the absence of gas supply. It was found that at the initial moment of the reaction, the energy of cavitation was spent on breaking up clusters of bacterial aggregates into single cells, and death occurs more slowly than disaggregation. Practical value. It has been experimentally proved that the accumulation of microbial counts in the first stage of the water purification process with short-term action of acoustic cavitation is due to the processes of disaggregation of microorganisms. References 27, figures 2.