Effect of flow velocity, substrate concentration and hydraulic cleaning on biofouling of reverse osmosis feed channels

Handle URI:
http://hdl.handle.net/10754/562141
Title:
Effect of flow velocity, substrate concentration and hydraulic cleaning on biofouling of reverse osmosis feed channels
Authors:
Radu, Andrea I.; Vrouwenvelder, Johannes S. ( 0000-0003-2668-2057 ) ; van Loosdrecht, Mark C.M.; Picioreanu, Cristian
Abstract:
A two-dimensional mathematical model coupling fluid dynamics, salt and substrate transport and biofilm development in time was used to investigate the effects of cross-flow velocity and substrate availability on biofouling in reverse osmosis (RO)/nanofiltration (NF) feed channels. Simulations performed in channels with or without spacer filaments describe how higher liquid velocities lead to less overall biomass amount in the channel by increasing the shear stress. In all studied cases at constant feed flow rate, biomass accumulation in the channel reached a steady state. Replicate simulation runs prove that the stochastic biomass attachment model does not affect the stationary biomass level achieved and has only a slight influence on the dynamics of biomass accumulation. Biofilm removal strategies based on velocity variations are evaluated. Numerical results indicate that sudden velocity increase could lead to biomass sloughing, followed however by biomass re-growth when returning to initial operating conditions. Simulations show particularities of substrate availability in membrane devices used for water treatment, e.g., the accumulation of rejected substrates at the membrane surface due to concentration polarization. Interestingly, with an increased biofilm thickness, the overall substrate consumption rate dominates over accumulation due to substrate concentration polarization, eventually leading to decreased substrate concentrations in the biofilm compared to bulk liquid. © 2012 Elsevier B.V.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Environmental Science and Engineering Program
Publisher:
Elsevier BV
Journal:
Chemical Engineering Journal
Issue Date:
Apr-2012
DOI:
10.1016/j.cej.2012.01.133
Type:
Article
ISSN:
13858947
Sponsors:
This work was financially supported by Wetsus, Centre of Excellence for Sustainable Water Technology. Wetsus is founded by the Dutch Ministry of Economic Affairs.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorRadu, Andrea I.en
dc.contributor.authorVrouwenvelder, Johannes S.en
dc.contributor.authorvan Loosdrecht, Mark C.M.en
dc.contributor.authorPicioreanu, Cristianen
dc.date.accessioned2015-08-03T09:45:45Zen
dc.date.available2015-08-03T09:45:45Zen
dc.date.issued2012-04en
dc.identifier.issn13858947en
dc.identifier.doi10.1016/j.cej.2012.01.133en
dc.identifier.urihttp://hdl.handle.net/10754/562141en
dc.description.abstractA two-dimensional mathematical model coupling fluid dynamics, salt and substrate transport and biofilm development in time was used to investigate the effects of cross-flow velocity and substrate availability on biofouling in reverse osmosis (RO)/nanofiltration (NF) feed channels. Simulations performed in channels with or without spacer filaments describe how higher liquid velocities lead to less overall biomass amount in the channel by increasing the shear stress. In all studied cases at constant feed flow rate, biomass accumulation in the channel reached a steady state. Replicate simulation runs prove that the stochastic biomass attachment model does not affect the stationary biomass level achieved and has only a slight influence on the dynamics of biomass accumulation. Biofilm removal strategies based on velocity variations are evaluated. Numerical results indicate that sudden velocity increase could lead to biomass sloughing, followed however by biomass re-growth when returning to initial operating conditions. Simulations show particularities of substrate availability in membrane devices used for water treatment, e.g., the accumulation of rejected substrates at the membrane surface due to concentration polarization. Interestingly, with an increased biofilm thickness, the overall substrate consumption rate dominates over accumulation due to substrate concentration polarization, eventually leading to decreased substrate concentrations in the biofilm compared to bulk liquid. © 2012 Elsevier B.V.en
dc.description.sponsorshipThis work was financially supported by Wetsus, Centre of Excellence for Sustainable Water Technology. Wetsus is founded by the Dutch Ministry of Economic Affairs.en
dc.publisherElsevier BVen
dc.subjectBiofilmen
dc.subjectBiofoulingen
dc.subjectFeed spaceren
dc.subjectFluid dynamicsen
dc.subjectModelen
dc.subjectReverse osmosisen
dc.titleEffect of flow velocity, substrate concentration and hydraulic cleaning on biofouling of reverse osmosis feed channelsen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.identifier.journalChemical Engineering Journalen
dc.contributor.institutionDepartment of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 67, 2628 BC Delft, Netherlandsen
dc.contributor.institutionWetsus, Centre of Excellence for Sustainable Water Technology, Agora 1, P.O. Box 1113, 8900 CC Leeuwarden, Netherlandsen
kaust.authorVrouwenvelder, Johannes S.en
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