Investigations of Cake Fouling During the Cross-Flow Microfiltration of a Model Suspension: Influence of Buoyancy on Deposition and Shear-Induced Removal

Lewis, W. J.; Chance, Robertl; Wilcox, Melissa; Chew, Y.M. John; Bird, Michael R.

doi:10.1016/j.proeng.2012.08.499

Cited by 2 publications

(1 citation statement)

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“…This might be attributed to the cake erosion through an increase in shear stress [31,32], although the membrane fouling in AnMBR is more complex than just cake formation. In this study, we therefore suggest sustaining shear stress (SGD m 2.0 m 3 m -2 h -1 ; G, 460 s -1 ) whilst reducing flux to match average flow, provides analogous behaviour, in which faster permeability recovery (through cake erosion) can be obtained, thereby presenting value to sewage works exposed to frequent flow variations [6].…”

Section: Discussionmentioning

confidence: 99%

Sustaining membrane permeability during unsteady-state operation of anaerobic membrane bioreactors for municipal wastewater treatment following peak-flow

Wang

Jefferson

Soares

et al. 2018

Journal of Membrane Science

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Key highlights Peak flow characteristics (size, duration and frequency) are examined for AnMBR  Increasing gas flow rate during peak flow improves recovery  Supra-critical fluxes can be sustained for short durations  Specifying average flux below critical flux improves recoverability  Membrane area should be based on average flow, reducing capital cost AbstractIn this study, the impact of peak flow on anaerobic membrane bioreactor operation is investigated to establish how system perturbation induced by diurnal peaks and storm water flows will influence membrane permeability. Good permeability recovery was attained through increasing gas sparging during peak flow, which was explained by the transition in critical flux of the suspension at higher shear rates. However, supra-critical fluxes could also be sustained, provided peak flow was for a short duration. We suggest longer durations of supra-critical operation could be sustained through introduction of reactive fouling control strategies (e.g. TMP set-point control). An initial flux below the critical flux, prior to the introduction of peak flow, was advantageous to permeability recovery, suggesting membrane 'conditioning' is important in governing recoverability following peak flow. The importance of conditioning was confirmed through analysis of multiple peak flow events in which the loss of permeability following each peak-flow event was increasingly negligible, and can be ascribed to the arrival of a steady-state in membrane surface deposition. Whilst responding to peak flow with increased gas sparging has been shown effective, the energy demand is considerable, and as such a pseudo dead-end filtration strategy was also evaluated, which required only 0.04 kWh m -3 of energy for gas sparging. Comparison of both filtration modes identified comparable fouling rates, and the feasibility of a low energy gas sparging method for peak flow management that has successfully enabled supra-critical fluxes to be achieved over long-periods in other MBR applications. Importantly, membrane . Please refer to any applicable publisher terms of use.2 area provides the highest contribution toward capital cost of AnMBR. The potential to turnup flux in response to peak-flow has been identified in this study, which suggests membrane area can be specified based on average flow rather than peak flow, providing substantive reduction in the capital cost of AnMBR for municipal wastewater treatment.

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Section: Discussionmentioning

confidence: 99%