Volume 13, Issue 3 (10-2017)
HSR 2017, 13(3): 340-346 |
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Golbabaei -Kootenaei F, Mehrdadi N, Asadi -Ghalhari M, Nabi -Bidhendi G, Amini -Rad H. The Effect of Ultrasonic Waves on the Solid Content Percentage in Dewatering of Excess Biological Sludge. HSR 2017; 13 (3) :340-346
URL: http://hsr.mui.ac.ir/article-1-956-en.html
URL: http://hsr.mui.ac.ir/article-1-956-en.html
Farshad Golbabaei -Kootenaei 
1, Nasser Mehrdadi2 , Mahdi Asadi -Ghalhari3 , Gholamreza Nabi -Bidhendi2 , Hasan Amini -Rad4
1, Nasser Mehrdadi2 , Mahdi Asadi -Ghalhari3 , Gholamreza Nabi -Bidhendi2 , Hasan Amini -Rad4
1- PhD Candidate, Department of Environmental Engineering, School of Environment, University of Tehran, Tehran, Iran
2- Professor, Department of Environmental Engineering, School of Environment, University of Tehran, Tehran, Iran
3- Assistant Professor, Research Center for Environmental Pollutants AND Department of Environmental Health Engineering, School of Health, Qom University of Medical Sciences, Qom, Iran
4- Assistant Professor, Department of Environmental Engineering, School of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
2- Professor, Department of Environmental Engineering, School of Environment, University of Tehran, Tehran, Iran
3- Assistant Professor, Research Center for Environmental Pollutants AND Department of Environmental Health Engineering, School of Health, Qom University of Medical Sciences, Qom, Iran
4- Assistant Professor, Department of Environmental Engineering, School of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
Abstract: (785 Views)
Background: Today, sludge dewatering is one of the most difficult treatment processes in wastewater treatment plants. This subject is an important challenge in the decreasing of environmental pollutants. The purpose of this study was to determine the effect of ultrasonic waves on improved sludge dewatering and increased solid content of sludge, and determine the optimum operating parameters of the ultrasonic method.Methods: An experimental study was carried out as a batch mode. In this research, the effect of some variables including ultrasound density (watts per ml), time (minutes), and amount of sonificated sludge (percentage) on the solid content of sludge and sludge dewatering was assessed. The solid content of sludge samples was 20.3 ± 0.9% prior to dewatering. Statistical analyses were performed using SPSS software.Findings: The experiments determined that the optimum operating parameters were sonification time of 5 minutes and ultrasound density of 1 W/ml. Moreover, the amount of sonificated sludge was equal to 15% and a frequency of 20 kHz was produced. The amount of solid content of sludge obtained under these conditions was equal to 26.4% that is a 30% increase in dewatering of sludge.Conclusion: Based on the results of this research, ultrasound waves and micro- and nano-bubbles of cavitation can increase the solid content of sludge and improve sludge dewatering process and sludge treatment efficiency.
Type of Study: Research |
Subject:
education health and promotion
Received: 2020/07/16 | Accepted: 2017/10/15 | Published: 2017/10/15
Received: 2020/07/16 | Accepted: 2017/10/15 | Published: 2017/10/15
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