Abstract
Fouling is the main bottleneck of the widespread of MBR systems. One way to decrease and/or control fouling is by process hydrodynamics. This can be achieved by the increase of liquid crossflow velocity. In rotational cross-flow MBR systems, this is attained by the spinning of e.g. impellers. Validation of the CFD model was made against LDA tangential velocity measurements (error less than 8 %) using water a fluid. The shear stress over the membrane surface was inferred from the CFD simulations for water. However, activated sludge is a non-Newtonian liquid, for which the CFD model was modified incorporating the non-Newtonian behaviour of activated sludge. Shear stress and area-weighted average shear stress relationships were made giving error less that 8 % compared to the CFD results. An empirical relationship for the area-weighted average shear stress was developed for water and activated sludge as function of the angular velocity and the total suspended solids concentration.
Originalsprog | Engelsk |
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Titel | Proceedings of the 6th IWA Specialist Conference on Membrane Technology for Water and Wastewater Treatment, Aachen, Germany |
Antal sider | 8 |
Forlag | IWA Publishing |
Publikationsdato | 2011 |
Status | Udgivet - 2011 |
Begivenhed | 6th IWA Specialist Conference on Membrane Technology for Water and Wastewater Treatment - Aachen, Tyskland Varighed: 4 okt. 2011 → 7 okt. 2011 |
Konference
Konference | 6th IWA Specialist Conference on Membrane Technology for Water and Wastewater Treatment |
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Land/Område | Tyskland |
By | Aachen |
Periode | 04/10/2011 → 07/10/2011 |
Bibliografisk note
Published on a usb.Emneord
- CFD
- Shear Stress
- Non-Newtonian
- Rotating Cross-Flow MBR