Ultrasonic Disintegration of Bacteria Contained in Treated Wastewater
 
 
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Department of Chemistry, Biology and Biotechnology, Faculty of Civil and Environmental Engineering, Bialystok University of Technology, Wiejska 45E, 15-351 Bialystok, Poland
CORRESPONDING AUTHOR
Eliza Hawrylik   

Department of Chemistry, Biology and Biotechnology, Faculty of Civil and Environmental Engineering, Bialystok University of Technology, Wiejska 45E, 15-351 Bialystok, Poland
Publish date: 2019-10-01
 
J. Ecol. Eng. 2019; 20(9):171–176
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ABSTRACT
The amount of wastewater discharged in Poland is constantly increasing. Despite the fact that wastewater is subject to purification processes, it is a place of occurrence of many microorganisms, including pathogenic bacteria, that get into the environment and pose a biological threat. The purpose of this paper was to explore the possibility of using a low-frequency ultrasound to disintegrate microorganisms found in treated wastewater. The paper presents research on the use of ultrasound with a frequency of 20 and 40 kHz, with variable and constant operation mode of an ultrasonic cleaner, to destroy bacteria of the Sarcina genus. The results obtained indicate the effective action of ultrasonic waves in relation to the microorganisms studied. Already a 5-minute exposure to ultrasound at a frequency of 20 kHz with a continuous operation mode of the device caused a decrease in the number of bacteria by over 60%. The 30-minute operation of 40 kHz ultrasonic waves resulted in 80% decrease in the number of microorganisms compared to the control. The obtained results prove the possibility of using the ultrasonic disintegration process in municipal wastewater treatment plants.