Show simple item record

dc.contributor.authorAlnajjar, Heba
dc.contributor.authorTabatabai, A.
dc.contributor.authorAlpatova, Alla
dc.contributor.authorLeiknes, TorOve
dc.contributor.authorGhaffour, NorEddine
dc.date.accessioned2021-01-31T11:11:54Z
dc.date.available2021-01-31T11:11:54Z
dc.date.issued2021-01-30
dc.date.submitted2020-08-24
dc.identifier.citationAlnajjar, H., Tabatabai, A., Alpatova, A., Leiknes, T., & Ghaffour, N. (2021). Organic fouling control in reverse osmosis (RO) by effective membrane cleaning using saturated CO2 solution. Separation and Purification Technology, 118410. doi:10.1016/j.seppur.2021.118410
dc.identifier.issn1383-5866
dc.identifier.doi10.1016/j.seppur.2021.118410
dc.identifier.urihttp://hdl.handle.net/10754/667121
dc.description.abstractAlthough reverse osmosis (RO) currently dominates the global desalination market, membrane fouling remains a major operational obstacle, which penalizes sustainable plant operation. This study explores a new membrane cleaning technique that uses a saturated CO2 solution to alleviate membrane fouling caused by organic matter, without any additional chemicals. When the CO2 saturated solution is injected into the membrane module at a given pressure, CO2 bubbles start nucleating throughout the membrane surface. This phenomenon is intensified underneath the deposited foulants. The porous structure of the foulants presents cavities, which are considered as imperfection sites that act as a substrate for CO2 bubbles nucleation, leading to an effective membrane cleaning. In this study, sodium alginate, a model polysaccharide, was mixed with different concentrations of Ca2+ to evaluate the cleaning efficiency of the CO2 technique under severe operating conditions when formed Ca2+/alginate fouling layers significantly impend the RO process performance. Furthermore, the effect of hydrodymamic conditions and CO2 saturation pressure on efficiency of permeate flux recovery and membrane morphology is also evaluated and the results are compared to those achieved with Milli-Q water and acidic solution at pH 4 cleanings. Better permeate flux recoveries were observed at higher Ca2+ concentrations comparing to fouling expriments at lower concentrations. The observed effect was attributed to a transition from the gel layer to a looser cake layer which makes CO2 bubble nucleation and subsequent permeate flux recovery more effective due to the presence of a larger number of CO2 nucleation sites as a result of a formation of more porous fouling structures. Permeate flux recovery increased with the increase in cleaning time, cross-flow velocity and CO2 saturation pressure.
dc.description.sponsorshipThe research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors would like to thank personnel of Water Desalination and Reuse Center (WDRC) and KAUST Core Lab for their assistance in water quality and surface characterization measurements.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S138358662100112X
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Separation and Purification Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Separation and Purification Technology, [, , (2021-01-30)] DOI: 10.1016/j.seppur.2021.118410 . © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleOrganic fouling control in reverse osmosis (RO) by effective membrane cleaning using saturated CO2 solution
dc.typeArticle
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentKing Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Biological and Environmental Science and Engineering (BESE), Thuwal 23955, Saudi Arabia.
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalSeparation and Purification Technology
dc.rights.embargodate2023-01-30
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Chemistry, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
dc.contributor.institutionLhoist Business Innovation Center, 31 Rue de l’Industrie, B-1400, Nivelles, Belgium.
dc.identifier.pages118410
kaust.personAlnajjar, Heba Rashad Ali
kaust.personTabatabai, A.
kaust.personAlpatova, Alla
kaust.personLeiknes, TorOve
kaust.personGhaffour, Noreddine
dc.date.accepted2021-01-25
refterms.dateFOA2021-01-31T11:12:43Z
kaust.acknowledged.supportUnitKAUST Core Lab
kaust.acknowledged.supportUnitWater Desalination and Reuse Center (WDRC)


Files in this item

Thumbnail
Name:
organic fouling_RO cleaning with CO2 Seppur 2021 online version.pdf
Size:
2.157Mb
Format:
PDF
Description:
Accepted manuscript
Embargo End Date:
2023-01-30

This item appears in the following Collection(s)

Show simple item record