Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"flux decline"”.
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Interaction between membrane and protein properties on flux decline during sterile microfiltration
… been conducted to further the understanding of flux decline due to protein fouling. Many times the operating conditions, the type of membrane and type of protein all interact to have an effect on protein fouling and flux decline. Normal-flow microfiltration experiments were conducted using …
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A Numerical Model for Flux Decline During the Crossflow Ultrafiltration of Colloidal Suspensions
… Hence, the unsteady nature of the permeate flux decline must be caused by changes in the hydraulic boundary condition at the membrane surface due to cake formation during filtration. A step-wise pseudo steady-state model was developed to predict the flux decline due to concentration …
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The prediction of flux decline in cross-flow microfilters via three-dimensional fluid dynamic models of tortuous pore structure
… occur and bring about a reduction of microfilter flux. This research develops a fluid dynamic model of the tortuous pore geometry to simulate the progression of fouling and investigate the associated effect on flux decline. A three-dimensional tortuous pore geometry was created to study the …
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Fouling of Aluminum Oxide Microfiltration Membranes by Semi-Synthetic Metal Working Fluids
… this fluid did not show evidence of significant flux decline. Functionality tests showed no difference in cooling and lubrication between the reformulated fluid and a commercial semi-synthetic MWF.
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A mechanistic study on the coupled organic and colloidal fouling of nanofiltration membranes
… mechanisms responsible for enhanced membrane flux decline in the presence of multiple foulant types are examined experimentally: increased hydraulic resistance of the mixed cake layer structure, hindered foulant diffusion due to interactions between solute concentration polarization (CP) …
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Effect of solids retention time in membrane bioreactors on reverse osmosis membrane fouling
… and on the RO membranes, as well as the specific flux across the RO membranes. While the concentrations of organic and inorganic constituents in the MBR permeate were similar at the different SRTs, they accumulated to different concentrations on the RO membranes, and different rates of RO specific …
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MODELLING CRYSTALLIZATION FOULING IN LIQUID-TO-AIR MEMBRANE ENERGY EXCHANGERS
… can predict the crystallization fouling rate, decline in moisture transfer flux due to fouling, and the operating/design conditions where fouling is likely to occur. In this thesis, a semi-empirical model is developed to predict crystallization fouling of the membrane in LAMEEs. The solution …
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Development of Modified Reverse Osmosis Membrane with Polymers/Graphene Oxide for Scaling and Biofouling Mitigation
… hinder membrane performance, reducing water flux and increasing maintenance costs. This study uniquely explored, the dual antifouling and antibiofouling properties of polymaleic acid (PMA) in an RO system. PMA was applied in two forms: as a membrane coating (ESPA2-PMA) and as an anti-scalant …
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Investigation of Membrane Fouling and Cleaning in Direct Contact Membrane Distillation of Municipal Wastewater
… temperature, feed water quality, permeate flux, membrane area, cross flow velocity, and membrane type and pore size. An (EDTA) cleaning solution was used to clean a 0.2μm polypropylene (PP) membrane that had reached a 50% flux decline due to wastewater effluent fouling. The cleaning process …
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Role of Exopolymeric Substances in Biofilm Formation on Dairy Separation Membranes
… fouling is a major limiting factor that leads to flux decline and affects product quality. The growth of biofilms on membranes contributes to biofouling. Biofilms are very difficult to eliminate, and will serve as the seed for additional biofilm development and product contamination. The biofilm …
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Electrochemical Pretreatment for Microfiltration of Surface Water: Mechanisms of Fouling and Its Control
… experiments, cake filtration was the predominant flux decline mechanism for the entire duration of MF. Fouling was controlled by antagonistic effects of adding more and more aluminum coagulant; increasing total mass loading of colloidal foulants (higher total filtration resistance) and creating …
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Evaluation of a Typical CIP Protocol to Control Bacterial Biofilms on Whey Reverse Osmosis Membranes
… on reverse osmosis membranes cause severe flux decline during whey process1ng. Our previous studies provided clear evidence of mixed species biofilms on the membranes obtained from a commercial whey processing plant. Presence of resistant microflora such as Bacillus, Escherichia coli, …
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Organic fouling of desalination membranes
… pressure on foulant layer properties and ux decline and also enable the calculation of foulant layer thickness from measured flux. The findings provide new insight into the relative fouling propensity of membrane desalination systems, the factors influencing ux decline, and the mechanisms of …
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Performance and Fouling during Bioreactor Harvesting
… structures, mathematical modeling to predict the flux and fouling, fouling visualization using confocal laser scanning microscopy, and fouling identification using liquid chromatography-mass spectrometry. </p> <p>For the feed streams studies, filtration of yeast suspensions and Chinese hamster …
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Dead-end and crossflow microfiltration of yeast and bentonite suspensions: experimental and modelling studies incorporating the use of artificial neural networks
… specific cake resistance and steady state flux of dried yeast suspensions in dead-end microfiltration for a range of operating parameters. Trained networks were used in predicting filtration characteristics of previously unseen data, with excellent agreement. Network weights were …
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Metal oxide modified tubular ceramic membrane for the separation of oil-in-water emulsion.
… test parameters for percentage oil rejection, flux, and flux recovery ratio. Where results from these tests were compared to results from unmodified Al2O3 tubular ceramic membrane, the MgO-modified membrane displayed a higher percentage oil rejection efficiency of 98%, leaving behind an O/W …
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Deformation-assisted antifouling of surfaces
… and form a foulant film that results in flux decline At the desired flux, deformation-induced cleaning (DIC) was applied The membranes were deformed through permeate pressure modulation Excellent flux recoveries were achieved even in the presence of spacers, without incurring any damage …
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The impact of genetic variation on functional, technological and digestive properties of β-lactoglobulin
… of the membrane plays a critical role in both flux decline, and by proxy, process efficiency, with β-lg reported to be a major contributor to fouling. It was found that transmission of whey proteins during MF of skim milk was higher for the skim milk containing the A variant than the B variant …