https://doi.org/10.25678/0004ZB

Data for: Cross flow frequency determines the physical structure and cohesion of membrane biofilms developed during gravity-driven membrane ultrafiltration of river water: Implication for hydraulic resistance

We evaluated how intermittent shear influences the physical structure, material properties and hydraulic resistance of membrane biofilms developed during gravity-driven ultrafiltration of river water, with the ultimate goal of increasing the filtration performances. Our results indicate intermittent shear helps slowing-down the flux decline but does not help to increase the level of stabilisation of the permeate flux. After several weeks, the biofilms exposed to different shear regimes were indeed characterised by similar hydraulic resistance. But the characteristic time to achieve a stable flux increased from 7 d to 25d when increasing the shear frequency. Also, most of the hydraulic resistance (up to 95%) was governed by the base layer that remained attached after erosion tests. With increasing exposure to shear conditions, the biofilms became more cohesive and more elastic, thus resisting better to cross flow conditions. Overall, our results demonstrate that engineering membrane biofilms with a desired permeability is not feasible using intermittent shear due to significant adaptability of the biofilms to their hydraulic environment.

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Derlon, N., Desmond, P., Rühs, P., & Morgenroth, E. (2021). Data for: Cross flow frequency determines the physical structure and cohesion of membrane biofilms developed during gravity-driven membrane ultrafiltration of river water: Implication for hydraulic resistance (Version 1.0) [Data set]. Eawag: Swiss Federal Institute of Aquatic Science and Technology. https://doi.org/10.25678/0004ZB

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Derlon, N., Desmond, P., Rühs, P. A., & Morgenroth, E. (2022). Cross flow frequency determines the physical structure and cohesion of membrane biofilms developed during gravity-driven membrane ultrafiltration of river water: Implication for hydraulic resistance. Journal of Membrane Science, 643, 120079. https://doi.org/10.1016/j.memsci.2021.120079

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Author	Derlon, Nicolas Desmond, Peter Rühs, Patrick Morgenroth, Eberhard
Keywords	Biofilm,permeability,hydraulic resistance,membrane filtration,ultrafiltration,GDM
Variables	total_organic_carbon
Substances (generic terms)	organic carbon polysaccharides proteins
Organisms (generic terms)	bacteria
Systems	filtration system
Timerange	*
Review Level	none
Curator	Derlon, Nicolas
Contact	Derlon, Nicolas <Nicolas.Derlon@eawag.ch>
DOI	10.25678/0004ZB