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Influence of Low-Frequency Ultrasound on the Disintegration of Coliform and Fecal Coliform Bacteria
Eliza Hawrylik 1  
,   Andrzej Butarewicz 1  
 
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Department of Chemistry, Biology and Biotechnology, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, 15-351 Białystok, Poland
CORRESPONDING AUTHOR
Eliza Hawrylik   

Department of Chemistry, Biology and Biotechnology, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology
Publication date: 2021-10-01
 
J. Ecol. Eng. 2021; 22(9):192–197
 
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ABSTRACT
Wastewater is a place of the widespread occurrence of pathogenic microorganisms, which, if they get into the environment, can cause many bacterial diseases. The lack of widespread use of the wastewater disinfection process raises more and more concerns about the sanitary quality of wastewater leaving treatment plants. This article aimed to test the effectiveness of the ultrasonic disintegration process against coliform bacteria and fecal coliforms in treated wastewater. The paper presents research on the use of ultrasound with a frequency of 20 and 40 kHz, with a variable and constant operating mode of an ultrasonic cleaner. The obtained test results confirm the effectiveness of the applied method. 25-minute sonication in most of the analyzed cases reduces the number of tested microorganisms by over 90% compared to the control sample. Ultrasonic disintegration can therefore be successfully used in municipal wastewater treatment plants. The use of ultrasound for disinfection can improve the sanitary safety of wastewater discharged into water or soil.