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• W3127604375 endingPage "118410" @default.
• W3127604375 startingPage "118410" @default.
• W3127604375 abstract "• CO 2 nucleation technique is utilized to remove organic fouling from RO membrane. • Physical cleaning by CO 2 bubbles outperformed conventional hydraulic flushing. • Flux recovery depended on cleaning time, crossflow velocity and CO 2 saturation pressure. • Complete removal of foulants from membrane surface after CO 2 nucleation cleaning. Although 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 CO 2 solution to alleviate membrane fouling caused by organic matter, without any additional chemicals. When the CO 2 saturated solution is injected into the membrane module at a given pressure, CO 2 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 CO 2 bubbles nucleation, leading to an effective membrane cleaning. In this study, sodium alginate, a model polysaccharide, was mixed with different concentrations of Ca 2+ to evaluate the cleaning efficiency of the CO 2 technique under severe operating conditions when formed Ca 2+ /alginate fouling layers significantly impend the RO process performance. Furthermore, the effect of hydrodymamic conditions and CO 2 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 Ca 2+ 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 CO 2 bubble nucleation and subsequent permeate flux recovery more effective due to the presence of a larger number of CO 2 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 CO 2 saturation pressure." @default.
• W3127604375 created "2021-02-15" @default.
• W3127604375 creator A5005935491 @default.
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• W3127604375 date "2021-06-01" @default.
• W3127604375 modified "2023-10-17" @default.
• W3127604375 title "Organic fouling control in reverse osmosis (RO) by effective membrane cleaning using saturated CO2 solution" @default.
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• W3127604375 doi "https://doi.org/10.1016/j.seppur.2021.118410" @default.
• W3127604375 hasPublicationYear "2021" @default.
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