Journal of Advances in Environmental Health Research

Journal of Advances in Environmental Health Research

Inactivation of Coliforms in Sludge Through Cavitation Phenomena by Ultrasonic Waves

Document Type : Original Article

Authors
Farshad Golbabaei Kootenaei 1
Nasser Mehrdadi 1
Gholamreza Nabi Bidhendi 1
Hasan Aminirad 2
Mohammad Amin Mirrezaei 1
Farimah Saeidi 1
1 Department of Environmental Engineering, Faculty of Environment, College of Engineering, University of Tehran, Tehran, Iran
2 Department of Environmental Engineering, Faculty of Civil Engineering, Babol (Noshirvani) University of Technology, Babol, Iran
10.34172/jaehr.2023.11
Abstract
Background: One of the most challenging and critical processes in wastewater treatment is sludge treatment. This study aimed to investigate the effects of low frequency ultrasound and high level of energy on inactivation rate of total coliform of sludge and ascertain the optimal operating parameters of the ultrasound waves.
Methods: In this research, the density of ultrasound (W/mL) and time (minutes) were investigated. The effect of these parameters on the inactivation of total coliform in sludge was also investigated.
Results: The results revealed that the optimum operating time and ultrasound density were 30 minutes and 2.5 W/mL, respectively. Also, the frequency of 20 kHz of total coliform removal rate in these conditions was 99.44% .
Conclusion: Ultrasound waves as well as micro and nano bubbles could remove total coliform and decontaminate the sludge, thereby incrementing the rate of treatment.
Keywords
Cavitation
Nano-bubbles
Sludge
Total coliform
Ultrasound density
Subjects
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Journal of Advances in Environmental Health Research
Volume 11, Issue 2
Spring 2023
Pages 89-93