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 20 of 37 for “"permeate flux"”.
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Conductive Membranes for Fouling Mitigation and Permeate Flux Control
… This thesis explores fouling mitigation and permeate flux control through conductive modification of the microfiltration membrane, namely coating a layer of conducting polymer on the membrane surface, to improve the function and, subsequently, cost-effectiveness of filtration systems. In this …
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Laminar fluid flow, particle transport and permeate flux behavior in crossflow membrane filters
… (PSD) and initial permeation rate on permeate flux are reported. Existing transient models based on shear-induced diffusion and particle adhesion as well as the steady state inertial lift model are found inadequate in predicting experimental observations of the specific permeate flux …
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Mechanism study of virus removal in membrane filtration and the application to improve virus removal
… major concern is the trade-off between the water permeate flux and the virus removal efficiency. The objective of this study is to understand factors controlling virus removal in low pressure membrane filtration. The virus transport in the membrane surface vicinity was investigated with the …
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Effect of operating parameter on membrane distillation performance using kapok fibre for humic acid treatment
… humic solution at 60°C has produced the highest permeate flux of 0.629 kg/m2h followed by 98.753 % of rejection at 40°C. Then, the lowest feed concentration of humic acid solution which 0.1 g/L showed the highest permeate flux of 0.634 kg/m2h followed by 97.47 % rejection rate. The 5 g of kapok …
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Fabrication of Electrospun Anti-fouling Membranes for Emulsified Oil-in-Water Separation
… so that a larger proportion of the original permeate flux can be recovered. The second approach is to improve the resistance against foulant deposition, so that the decrease in permeate flux is less severe. In this work, we look into both approaches to improve the anti-fouling properties of …
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Screening of Microfiltration and Ultrafiltration Ceramic Membranes for Produced Water Treatment and Testing of Different Cleaning Methods
… MF 0.1 m SiC membrane was selected based on the permeate flux and rejection performances. The selected MF membrane was used as the first filtration step. The two UF membranes, UF 0.04 m SiC and UF 150 KDa TiO2/ZrO2, were used for further treatment of the permeate. Finally, the UF membranes were …
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Investigation of Membrane Fouling and Cleaning in Direct Contact Membrane Distillation of Municipal Wastewater
… constructed including a warm feed loop and cold permeate loop to utilize a flat sheet, crossflow membrane cell. Treated wastewater effluent collected from the Albuquerque Bernalillo County Water Utility Authority (ABCWUA) Southside Water Reclamation Plant (SWRP) was used as the feed solution. The …
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Resistance-in-series modeling in high-shear rotary ultrafiltration
… the ability of the resistance-in-series (RIS) permeate flux model to predict pressure-flux data collected in the HSR-UF of a synthetic MW fluid. Experiments were conducted using a pilot-scale HSR-UF system with a 0.11 mum average-pore size membrane at a single temperature operating temperature …
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A Numerical Model for Flux Decline During the Crossflow Ultrafiltration of Colloidal Suspensions
… conditions. 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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Poly (2,6-dimethyl-1,4-phenylene oxide) hollow fibres for gas separation.
… wall thickness and carbon dioxide and methane permeate flux of the hollow fibres. A factorial design was used to determine which of the effects were significant and if there were any interactions between the variables that also affected the hollow fibre properties. The results were used to …
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Adsorption and membrane filtration for the separation and valorization of hemicellulose from organosolv beechwood hydrolyzates
… ultrafiltration was optimized in terms of high permeate flux and hemicellulose retention as well as low lignin retention as a function of transmembrane pressure, temperature, and pH. In addition, the effect of a prior adsorption step on ultrafiltration of beechwood hydrolyzate was studied. For …
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Desalination of water by vapor transport through hydrophobic nanopores
… suffers from persistent drawbacks including low permeate flux, low selectivity for non-ionic species, and lack of resistance to chlorine. This leaves ample rooms. for further improvement for RO technology by addressing these issues. In this thesis, a new approach is proposed for desalination by …
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Membrane Fouling In Cold Microfiltration Of Skim Milk: Mechanisms And Control
… fouling, which leads to a significant decline in permeate flux over time. This work aimed to elucidate the mechanisms of membrane fouling in cold (6C) MF of skim milk and optimize a CO2 backpulsing technique that can diminish membrane fouling by physically removing the foulant from the membrane …
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Effects of feed oil content, transmembrane pressure and membrane rotational speed on permeate water quality in high-shear rotary ultrafiltration
… rotational speed and feed oil content on permeate water quality in the treatment of a synthetic metal working fluid in the HSRUF system. Permeate oil grease and total organic carbon concentrations increased with transmembrane pressure and feed oil content due to the increased density or …
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Process Engineering Characteristics of the Hollow Fiber Ultrafiltration of Skimmilk
… and the major measured variable was permeate flux (J). Physical properties such as density, viscosity and protein content of the retentate were experimentally determined while diffusivity was estimated from literature values. The dependence of physical properties of the ultrafiltered …
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Studies on improved integrated membrane-based chromatographic process for bioseparation
… superimposable. Due to the lower transmembrane flux in this device plus the periodical washing-elution during the chromatographic separation, fouling was not a problem as it is in conventional microfiltration. A mathematical model describing the hydrodynamic and protein loading behaviors of the …
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A study on organic fouling of reverse osmosis membrane
… cell which was designed to measure five local permeate flux along the channel. It was found that some key parameters (such as pH, ionic strength, ion type) of solution chemistry had significant impacts on the fouling potential of organic solution. Additionally, apart from feed solution …
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Evaluation of membrane filtration for treatment of black liquor in small-scale pulp and paper mills in India
… quality of the lignin in the concentrate and the permeate, and how they vary over time. Additionally, the permeate flux rate change over time is also observed to determine the required frequency of cleaning membranes from reversible fouling of membranes, as well as the frequency to replace …
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Application of bulk nanobubbles in ultrafiltration and spray drying of dairy concentrates
… energy usage while keeping high permeation flux values is critical for eco-efficiency. In this research, application of bulk nanobubbles (NBs) for improving the processability and functionality of various dairy concentrates were evaluated. The chapter 3, 4, and 5 investigated the use of NBs …
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Membrane Fouling Mitigation with Water Hammer
… various operating parameters to determine the permeate flux improvement by the applied water hammer. Up to 84% permeate flux enhancement was obtained with water hammer. The ability of the water hammer to ease membrane fouling decreased with increase in transmembrane pressure (TMP) and feed …
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