Evidence for shape-dependent deposition in crossflow microfiltration of microbial cells

Foley, Greg; McCarthy, A.A.; Walsh, Padraig K.

doi:10.1016/j.memsci.2004.12.012

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Indeed, the filtration of a very complex mixed liquor such as the activated sludge, characterized by the presence of microorganisms and suspended particles, does not enable a reliable estimate of the deposition mechanisms. Moreover, the peculiar nature and morphology of microorganisms, changing over time, might modify the deposition phenomenon, improving or worsening the specific cake permeability from time to time [ 17 , 69 , 149 , 150 , 151 , 152 , 153 ].…”

Section: Features Of the Superficial Deposition And Role Of Physicmentioning

confidence: 99%

A Brief Review on the Resistance-in-Series Model in Membrane Bioreactors (MBRs)

Bella

Trapani

2019

Membranes

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The cake layer deposited on the membrane modules of membrane bioreactors (MBRs), especially under a submerged configuration, represents a relevant and fundamental mechanism deeply influencing the development of membrane fouling. It negatively affects the total resistance to filtration, while exerting a positive effect as a “pre-filter” promoting the “dynamic membrane” that protects the physical membrane from internal fouling. These two opposite phenomena should be properly managed, where the submerged membranes are usually subjected to a periodical cake layer removal through ordinary (permeate backwashing and air scouring) and/or irregular cleaning actions (manual physical cleaning). In this context, the physical removal of the cake layer is needed to maintain the design filtration characteristics. Nevertheless, the proper evaluation of the effect of physical cleaning operations is still contradictory and under discussion, referring in particular to the correct evaluation of fouling mechanisms. The aim of the present work was to summarize the different aspects that influence the fouling investigations, based on simple models for the evaluation of the resistance to filtration due to the cake layer, through physical cleaning operations.

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Section: Features Of the Superficial Deposition And Role Of Physicmentioning

confidence: 99%

A Brief Review on the Resistance-in-Series Model in Membrane Bioreactors (MBRs)

Bella

Trapani

2019

Membranes

View full text Add to dashboard Cite

show abstract

“…Polydispersity of naturally occurring macromolecules such as polysaccharides and humic substances, have also added a particular complexity on investigation to the fouling membrane mechanisms. Advances in understanding fouling of other species such as bacteria, yeast, emulsions, suspensions, salts and colloids from food wastewater have occurred in microfiltration and ultrafiltration literature (Chan et al, 2002;Foley et al, 2005;Hughes & Field, 2006;Cheng et al, 2008). There are two form of membrane fouling: the fouling layer that is readily removable from the membrane, it is often classified as polarization phenomena or reversible fouling and is removed by physical procedures.…”

Section: Membrane Fouling Control In Food Industry For Wastewater Trementioning

confidence: 99%