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    Increasing the efficiency of wastewater treatment at dairy industry enterprises using cavitation equipment
    (КПІ ім. Ігоря Сікорського ; ТОВ «Українська водна спілка», 2025) Tselen, Bogdan; Obodovych, Oleksandr; Ivanitsky, Georgiy; Sablii, Larysa; Hozhenko, Liubov; Nedbailo, Anna; Radchenko, Nataliya
    The article considers the problems of neutralization concentrated milky whey wastewater.The actuality ofthe research caused by the difficulty of utilization of acidic milky whey wastewater due to its unstablecomposition, high acidity and significant microbial pollution, which resulted in a high biological oxygendemand.In addition, the high chemical oxygen demand, which reflects a significant organic load and createsa problem for treatment technologies and ecological danger.The authors analyzed traditional andinnovative treatment technologies with an accent on the advantages and disadvantages of each.Based on theanalyzed data, it has proposed to use hydrodynamic cavitation as an auxiliary intensifying method in thetechnologies of neutralization concentrated milky whey wastewater.To realize it, the authors proposed aspecially designed device of rotary-pulsation type. In order to determine the feasibility of the proposedsolution, it is formulated by the tasks of evaluating the change in the microbiological indicator, chemicaloxygen demand and biological oxygen demand under different treatment regimes. Also, determine thepattern of changes in temperature and dissolved oxygen concentration over the treatment time. According tothe research results, the microbiological indicator of mesophilic aerobic and facultative anaerobicmicroorganisms showed the most significant decrease from at 3600 rpm within 10 minutes of treatment.Atthe same time, the neutralization of coliform bacteria has achieved after 2 minutes of treatment.Thebiological oxygen demand value showed a maximum reduction of 30 % at 3600 rpm during a 20-minutetreatment cycle.The chemical oxygen demand value for the same time showed a similar pattern of decreaseby 40 % at a linear temperature rise. In other words, the treatment in the proposed type of rotor-pulsationapparatus can be considerate as auxiliary equipment in the technologies of neutralization of concentratedmilky whey wastewater.Recirculation treatment for 20 minutes at 3600 rpm is consider as optimal.