First results on biostimulation of denitrifying activated sludge using low frequency ultrasound

Reduction of nitrate to nitrogen is critical for wastewater treatment process. The present work proposed a promising approach to improve the activity of denitrifying activated sludge by using low frequency ultrasonic treatment. Batch activity assays showed that when ultrasound was applied, denitrifi...

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Bibliographic Details
Published in:Water and environment journal : WEJ 2017-11, Vol.31 (4), p.463-469
Main Authors: Ben youcef, Nabil, Pauss, André, Sarde, Claude‐Olivier, Mameri, Nabil, Lounici, Hakim, Abdi, Nadia
Format: Article
Language:English
Subjects:
Activated sludge
Bacteria
biostimulation
Denitrification
Engineering Sciences
Environmental Sciences
Low frequencies
Low frequency
Nitrate removal
Nutrient removal
Parameters
Removal
Sludge
Ultrasonic imaging
Ultrasonic processing
Ultrasound
Wastewater
Wastewater treatment
Water treatment
Water treatment plants
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Summary:Reduction of nitrate to nitrogen is critical for wastewater treatment process. The present work proposed a promising approach to improve the activity of denitrifying activated sludge by using low frequency ultrasonic treatment. Batch activity assays showed that when ultrasound was applied, denitrification performance was 2.64 higher than the control. Kinetic analysis of nitrate removal rate versus ultrasonic power and duty cycle was performed to investigate the effect of operational parameters on activated sludge activities. The best stimulating effect was observed at 40 W ultrasonic power and 40% duty cycle. The above results demonstrated that ultrasonic stimulation can be used as a technique for enhancing bacterial activities for water treatment. Studies of other parameters that also affect the denitrification under ultrasound are under way.
ISSN:1747-6585
1747-6593
DOI:10.1111/wej.12264