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dc.contributor.authorKerdi, Sarah
dc.contributor.authorQamar, Adnan
dc.contributor.authorVrouwenvelder, Johannes S.
dc.contributor.authorGhaffour, NorEddine
dc.date.accessioned2020-10-15T11:38:50Z
dc.date.available2020-10-15T11:38:50Z
dc.date.issued2020-10-14
dc.date.submitted2020-06-17
dc.identifier.citationKerdi, S., Qamar, A., Vrouwenvelder, J. S., & Ghaffour, N. (2020). Biofilm removal efficacy using direct electric current in cross-flow ultrafiltration processes for water treatment. Journal of Membrane Science, 118808. doi:10.1016/j.memsci.2020.118808
dc.identifier.issn0376-7388
dc.identifier.doi10.1016/j.memsci.2020.118808
dc.identifier.urihttp://hdl.handle.net/10754/665595
dc.description.abstractBiofouling of membranes in water treatment is considered as one of the major practical problems. A novel and an efficient approach for cleaning biofilm grown on the membrane surface is proposed by applying a direct electric current (124 mA, 90 s) through platinum electrodes inside a cross-flow ultrafiltration channel. Depending on the electrochemical reactions occurring at the electrodes, either chlorine or hydrogen-producing configuration is realized by interchanging the current polarity. Baseline determination of the amount of chlorine generated and change in pH is assessed as a function of current intensity, linear cross-flow velocity, and duration of applied current. The efficiency of the proposed method is determined by investigating electrically treated biofilm through bacterial inactivation using Confocal Laser Scanning Microscopy (CLSM), bacterial cell structure changes through Scanning Electron Microscopy (SEM), and by estimating the amount of biomass removal through Optical Coherence Tomography (OCT). When a chlorine-producing electrode is placed at the inlet of the flow cell, 68% of bacterial inactivation is achieved without any modification of bacterial cell shape. Furthermore, a high and near-complete biomass removal is achieved (99%) after a subsequent forward flush of the electrically treated biofilm. However, placing a hydrogen-producing electrode at the inlet reveals a slightly lower bacterial inactivation (65%) and lower biomass removal (77%). Additional systematic experiments using individually sodium hydroxide (NaOH), sodium hypochlorite (NaOCl), or gas microbubbles enabled to elucidate the cause of biofilm removal, synergic effect of caustic agent NaOH and microbubbles.
dc.description.sponsorshipThe research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors extend their gratitude to the Water Desalination and Reuse Center (WDRC) staff for their continuous support. Imaging and Characterization Lab (ICL) staff is also highly acknowledged for their assistance and support in this project.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0376738820313831
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Membrane Science. 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 Journal of Membrane Science, [, , (2020-10-14)] DOI: 10.1016/j.memsci.2020.118808 . © 2020. 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.titleBiofilm removal efficacy using direct electric current in cross-flow ultrafiltration processes for water treatment
dc.typeArticle
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.identifier.journalJournal of Membrane Science
dc.rights.embargodate2022-10-14
dc.eprint.versionPost-print
dc.identifier.pages118808
kaust.personKerdi, Sarah
kaust.personVrouwenvelder, Johannes S.
kaust.personGhaffour, Noreddine
dc.date.accepted2020-10-04
refterms.dateFOA2020-10-15T11:40:14Z
kaust.acknowledged.supportUnitWater Desalination and Reuse Center (WDRC)


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