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dc.contributor.authorAl Ghamdi, Mohanned
dc.contributor.authorAlhadidi, Abdulsalam
dc.contributor.authorGhaffour, NorEddine
dc.date.accessioned2019-08-20T12:34:09Z
dc.date.available2019-08-20T12:34:09Z
dc.date.issued2019-08-13
dc.identifier.citationAl-Ghamdi, M. A., Alhadidi, A., & Ghaffour, N. (2019). Membrane backwash cleaning using CO2 nucleation. Water Research, 114985. doi:10.1016/j.watres.2019.114985
dc.identifier.doi10.1016/j.watres.2019.114985
dc.identifier.urihttp://hdl.handle.net/10754/656549
dc.description.abstractLow pressure membranes, such as ultrafiltration (UF), are widely used in water treatment applications, including the pretreatment of reverse osmosis desalination. UF membranes produce a water of superior quality, in addition to reducing the footprint and the use of chemicals, compared to conventional methods. However, membrane fouling remains a major drawback, and frequent membrane cleanings are required to maintain the flux of water and its quality. Typically, after a series of backwashes using an UF permeate, a chemical cleaning process is applied to fully recover the membrane's permeability. However, frequent chemical cleanings negatively affect the lifetime of the membrane, the environment, and increase operational costs. Here, we introduce a novel cleaning method that uses a solution saturated with CO2 to clean the membranes through the backwash step. As the pressure drops, the CO2 solution becomes supersaturated, and bubbles start to nucleate within the membrane pores and on its surface, resulting in the effective removal of the deposited fouling material. These foulants are further helping the nucleation process as they are considered as imperfection sites with high creation and growth of bubbles. Investigations performed for different synthetic feed solutions of organic compounds (sodium alginate), colloidal matter (silica) and sea salts, at different concentrations, show that our new physical cleaning process using CO2 is more performant than the regular backwash using Milli-Q water. We obtain a 100% flux recovery, in a short time, even under severe irreversible fouling conditions. Based on these results, we conclude that replacing water by a solution saturated with CO2 for the backwash cleaning of filtration membranes provides significant benefits to existing cleaning processes, and represent a promising alternative for improving and lowering the frequency of conventional chemical cleaning methods.
dc.description.sponsorshipThe research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. Authors extend their gratitude to the Water Desalination and Reuse Center (WDRC) lab staff for their support. The authors would also like to thank Xavier Pita, Scientific illustrator at KAUST, for creating Fig. 7.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0043135419307596
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Water Research. 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 Water Research, [[Volume], [Issue], (2019-08-13)] DOI: 10.1016/j.watres.2019.114985 . © 2019. 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.subjectmembrane cleaning
dc.subjectBackwash
dc.subjectFouling
dc.subjectCarbon dioxide nucleation
dc.subjectRO pretreatment
dc.subjectDesalination
dc.titleMembrane backwash cleaning using CO2 nucleation
dc.typeArticle
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.identifier.journalWater Research
dc.rights.embargodate2021-08-13
dc.eprint.versionPost-print
dc.contributor.institutionFujiFilm Manufacturing Europe B.V, Oudenstaart 1, 5047, TK, Tilburg, the Netherlands
kaust.personAl Ghamdi, Mohanned Abdullah Ahmed
kaust.personGhaffour, Noreddine
kaust.acknowledged.supportUnitWater Desalination and Reuse Center (WDRC)
dc.date.published-online2019-08-13
dc.date.published-print2019-08


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