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Membrane fouling in a submerged membrane bioreactor treating high strength municipal wastewater

Birima, Ahmed Hussien and Mohamed, Thamer Ahmed and Megat Mohd Noor, Megat Johari and Muyibi, Suleyman Aremu and Idris, Azni and Nagaoka, Hiroshi and Ahmed, J. and Abdullah, Abdul Ghani Liew (2009) Membrane fouling in a submerged membrane bioreactor treating high strength municipal wastewater. Desalination and Water Treatment, 7. pp. 267-274. ISSN 1944-3994 (O), 1944-3986 (P)

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Abstract

Studying the influence of the operating parameters on membrane fouling is important in fouling control. This paper presents the interaction effects of the sludge retention time (SRT), organic loading rate (OLR) and feed temperature (Tf) on membrane fouling. A submerged membrane bioreactor (SMBR) was operated under a constant flux (11.1 l/m2 h), with different SRT, Tf and OLR. A synthetic wastewater representative of high strength municipal wastewater was fed to the bioreactor. Three different levels (low, medium and high) of SRT, Tf and OLR were studied. These were 25, 30 and 35 days for SRT, 20, 30 and 40°C for Tf and OLR of 1.73, 4.03 6.82 kg COD/m3.d. The sustainable time (tsus) was defined as the time at which the rate of suction pressure started to increase rapidly. tsus was found to increase with low SRT and high Tf. A higher OLR resulted in higher mixed liquor suspended solids (MLSS), however it did not cause a faster membrane fouling. Applying higher aeration rate enabled a longer sustainable time to be obtained. Sustainable time tsus was found to be well correlated with MLVSS/MLSS with an r2 of 0.995. The range of MLVSS/MLSS tested varied from 74.3 to 82.3% at which tsus decreased 2.9-fold (from 175 to 60.5 h).

Item Type: Article (Journal)
Additional Information: 4164/6186
Uncontrolled Keywords: Membrane bioreactor; Synthetic wastewater; Organic loading rate; MLSS development; COD removal
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD201 Water supply for domestic and industrial purposes
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User: Prof SULEYMAN AREMU MUYIBI
Date Deposited: 10 Nov 2011 16:06
Last Modified: 22 Nov 2011 04:33
URI: http://irep.iium.edu.my/id/eprint/6186

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