Factors affecting fine bubble creation and bubble size for activated sludge

This paper addresses a study of air bubble creation in wastewater treatment system using both computational fluid dynamic (CFD) and experimental techniques. Based on the results found in this work, it was found that the bubble size depends on several factors such as flow rate, inlet pressure and con...

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Bibliographic Details
Published in:Water and environment journal : WEJ 2015-03, Vol.29 (1), p.105-113
Main Authors: Alkhalidi, Ammar A. T., Amano, R. S.
Format: Article
Language:English
Subjects:
Activated sludge
aeration
bubble size
Flow rates
Oxygen transfer
rubber membrane
SOTE
Wastewater treatment
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Summary:This paper addresses a study of air bubble creation in wastewater treatment system using both computational fluid dynamic (CFD) and experimental techniques. Based on the results found in this work, it was found that the bubble size depends on several factors such as flow rate, inlet pressure and contact angle for rubber membrane. Among these factors, it was found that the flow rate has the largest effect on the bubble size followed by membrane material contact angle. The punch size has a moderate effect on the bubble size while the punch length and punch direction have slight effect on bubble size. Finer bubbles are desired and they provide larger surface area and longer residency time which will improve the standard oxygen transfer.
ISSN:1747-6585
1747-6593
DOI:10.1111/wej.12083