Low dissolved oxygen membrane bioreactor processes (LDO-MBRs): a review Online publication date: Thu, 07-Nov-2013
by J.C. Chen; Do Khac Uan
International Journal of Environmental Engineering (IJEE), Vol. 5, No. 2, 2013
Abstract: Aeration energy demands for bioprocesses and membrane scouring in membrane bioreactors (MBRs) account for 50% to over 70% of the total operational energy consumption. Energy saving achieved by operating MBRs under low dissolved oxygen (DO) would be an interesting approach to bring MBRs to higher levels of efficiency. This review paper is first carried out to provide a systematic investigation on how to achieve good treatment performance and save energy in terms of lowering DO for MBRs. As a result, small scale MBRs operated under low DO (0.5-0.8 mg/L) can allow the process to work properly. At very low DO (0.2 mg/L), MBRs can still have a good performance, e.g., chemical oxygen demands and total nitrogen (TN) removal efficiencies are higher than 90% and 60%, respectively. However, low DO could lead to poor sludge flocculation resulting in increasing small particles which deteriorate the membrane filterability.
Online publication date: Thu, 07-Nov-2013
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Environmental Engineering (IJEE):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email email@example.com