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Sub-critical fouling in a membrane bioreactor for municipal wastewater treatment: experimental investigation and mathematical modelling.

Guglielmi, G, Saroj, DP, Chiarani, D and Andreottola, G (2007) Sub-critical fouling in a membrane bioreactor for municipal wastewater treatment: experimental investigation and mathematical modelling. Water Res, 41 (17). pp. 3903-3914.

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Abstract

Fouling is a major limitation for the application of membrane bioreactors (MBRs) in municipal wastewater treatment; the critical flux concept represents a valid tool for process optimisation in planning fouling control strategies. The paper presents the results obtained on a large pilot MBR equipped with a plate-and-frame ultrafiltration membrane. The experimental assessment of flux criticality was carried out by flux-stepping tests showing the positive impact of liquid temperature on the value of the critical threshold. The reliability of short-term tests was then verified over a long period by determining the time of sustainability, t(sust), of six different sub-critical fluxes ranging between 17 and 30Lm(-2)h(-1). An exponential fitting was observed in terms of fouling rate both before and after t(sust), though fouling after t(sust) is likely to be ascribed not only to cake formation. Finally, a new mathematical formulation was proposed according to the local flux approach to model the sub-critical TMP transients. The model involves both bound and free forms of EPS and, once experimentally calibrated, it provided a fair prediction of the TMP jump.

Item Type: Article
Authors :
NameEmailORCID
Guglielmi, GUNSPECIFIEDUNSPECIFIED
Saroj, DPUNSPECIFIEDUNSPECIFIED
Chiarani, DUNSPECIFIEDUNSPECIFIED
Andreottola, GUNSPECIFIEDUNSPECIFIED
Date : September 2007
Identification Number : 10.1016/j.watres.2007.05.047
Uncontrolled Keywords : Bioreactors, Calibration, Membranes, Artificial, Models, Theoretical, Pilot Projects, Polymers, Pressure, Time Factors, Ultrafiltration, Water Purification
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 13:10
Last Modified : 31 Oct 2017 16:40
URI: http://epubs.surrey.ac.uk/id/eprint/805354

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