Enhanced cross-flow filtration with flat-sheet ceramic membranes by titanium-based coagulation for membrane fouling control

2022 ◽  
Vol 16 (8) ◽  
Author(s):  
Xiaoman Liu ◽  
Chang Tian ◽  
Yanxia Zhao ◽  
Weiying Xu ◽  
Dehua Dong ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Cross Flow ◽  
Ceramic Membranes ◽  
Fouling Control ◽  
Cross Flow Filtration ◽  
Flat Sheet ◽  
Flow Filtration

Gas sparged cross-flow microfiltration of biologically treated wastewater

2000 ◽  
Vol 41 (10-11) ◽  
pp. 173-180 ◽  
Author(s):  
L. Vera ◽  
S. Delgado ◽  
S. Elmaleh
Keyword(s):  
Shear Stress ◽  
Membrane Fouling ◽  
Cross Flow ◽  
Solid Content ◽  
Treated Wastewater ◽  
Inorganic Membrane ◽  
Form Complex ◽  
Cross Flow Filtration ◽  
Mass Transport Process ◽  
Flow Filtration

A novel technique was tested for reducing tubular mineral membrane fouling by injecting gas into a cross-flow stream. The injected gas is thought to form complex hydrodynamic conditions inside the microfiltration module, which increase the wall shear stress, preventing the membrane fouling and enhancing the microfiltration mass transfer. The experimental study was carried out with biologically treated wastewater filtered through a tubular inorganic membrane (Carbosep M14). The flux, monotonously increasing with gas velocity, was more than tripled. New dimensionless quantities of shear stress number and resistance number were developed by generalisation of the dimensional analysis already carried out for the steady state flux of classical unsparged cross-flow filtration. A unique formalism allowed then interpreting the experimental results of both classical diphasic filtration and sparged filtration. The main limiting mass transport process was due to the solid content.

scholarly journals Extraction of laminarin from Saccharina latissima seaweed using cross-flow filtration

2021 ◽  
Author(s):  
Martin Sterner ◽  
Fredrik Gröndahl
Keyword(s):  
Molecular Weight ◽  
Microbial Degradation ◽  
Cross Flow ◽  
Ceramic Membranes ◽  
Saccharina Latissima ◽  
Dilute Acid ◽  
Liquid Pressure ◽  
Acid Pretreatment ◽  
Cross Flow Filtration ◽  
Flow Filtration

AbstractLaminarin is a low-molecular-weight polysaccharide found in seaweed (kelp), often in equal concentrations to that in the commercially important hydrocolloid alginate. However, while alginate can be easily recovered by dissolution followed by acid precipitation, for laminarin, there is no such straightforward way of recovering it. Laminarin can be used as dietary fiber and, if efficiently extracted, it may be used for functional food/feed applications and as a component in plant defense stimulants for agriculture. One way of concentrating laminarin from dilute solutions is to press the solution through ultrafine membranes that the molecules cannot pass through. When alginate is extracted, an acid pretreatment step is used and the dilute acid residue from that process also contains laminarin. We used cross-flow filtration to concentrate laminarin fromSaccharina latissima, retrieving it from the dilute acid solution of the acid pretreatment of an alginate extraction. Three ceramic membranes with 5, 15, and 50 kDa molecular weight cutoffs were used, and the pressure, temperature, and feed velocity were altered to reveal which parameters controlled the flow through the membrane and how efficiently laminarin was concentrated. The effects on laminarin extraction for fresh vs. frozen biomass were evaluated showing that frozen biomass releases more laminarin with a similar biomass homogenization technique. Thermal and microbial degradation of the feed components was studied during the course of the filtrations, showing that microbial degradation can affect the laminarin concentration, while the temperature of the process ~ 65 °C had little impact on laminarin. The techniques used to monitor the components in the feed and permeate during filtration were nuclear magnetic resonance,1H-NMR, and size exclusion chromatography. The filtrations were performed in a pilot-size filtration unit with ceramic membranes (ZrO2/TiO2, TiO2-Al2O support, 0.08 m2). To be able to operate without quick membrane fouling, the most important parameter was to have a high liquid velocity over the membrane, 4.7 m s−1. A good technique to concentrate laminarin was to prefilter it through a 50-kDa membrane using 2 bar liquid pressure and to concentrate it over a 5-kDa membrane using 5-bar liquid pressure. With these settings, the liquid flux through the filter became 60–80 and 30–40 L m−2 h−1over the 50-kDa and 5-kDa membrane.

Numerical Simulation of Filtration of Charged Oil Particles in Stationary and Rotating Tubular Membranes

2015 ◽  
Author(s):  
Sina Jahangiri Mamouri ◽  
Volodymyr V. Tarabara ◽  
André Bénard
Keyword(s):  
Flow Field ◽  
Electric Field ◽  
Electric Potential ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Cross Flow ◽  
Solid Cylinder ◽  
Permeate Flux ◽  
Cross Flow Filtration ◽  
Flow Filtration

Cross flow filtration (CFF) is a common membrane separation process with applications in food, biochemical and petroleum industries. In particular, membranes can be used for liquid-liquid separation processes such as needed in oil-water separation. A major challenge in cross flow filtration is membrane fouling. It can decrease significantly the permeate flux and a membrane’s efficiency. Membrane fouling can be mitigated by inducing shear on the membrane’s surface and this can be enhanced by inducing a swirl in the flow. In addition, a possible approach to improve membrane efficiency consists of repelling droplets/particles from the porous surface toward the centerline using a repulsive electric force. For this purpose, the surface of the membrane can be exposed to electric potential and droplets/particles are also induced to have the same electric charge. In this work, numerical simulations of charged non-deformable droplets moving within an axially rotating charged tubular membrane are performed. The results show that by increasing the electric potential on the membrane surface, the repelling force increases which obviously improves the grade efficiency of the membrane. However, the electric field gradients found in the flow field require large potentials on the membrane surface to observe a noticeable effect. Hence, a smaller solid cylinder is located in the centerline of the flow channel with zero potential. This solid cylinder enhances the electric field gradient in the domain which results in higher repelling forces and larger grade efficiency of the membrane at small potentials. The addition of a small cylinder in the flow field also improves the grade efficiency increases due to the higher shear stress near the membrane surface.

Cross-flow filtration of methane fermentation broth by ceramic membranes

1989 ◽  
Vol 68 (3) ◽  
pp. 200-206 ◽  
Author(s):  
Takuo Imasaka ◽  
Nobuhiko Kanekuni ◽  
Hiroyuki So ◽  
Shigeru Yoshino
Keyword(s):  
Fermentation Broth ◽  
Cross Flow ◽  
Ceramic Membranes ◽  
Methane Fermentation ◽  
Cross Flow Filtration ◽  
Flow Filtration

Cross-flow Filtration through Ceramic Membranes of Enzymes and Degradation Products from Enzymatic Peeling of Satsuma Mandarin Segments

2008 ◽  
Vol 14 (5_suppl) ◽  
pp. 71-76 ◽  
Author(s):  
M. Moliner ◽  
D. Saura ◽  
J.M. Ros ◽  
J. Laencina
Keyword(s):  
Molecular Weight ◽  
Pore Size ◽  
Degradation Products ◽  
Cross Flow ◽  
Ceramic Membranes ◽  
Satsuma Mandarin ◽  
Cross Flow Filtration ◽  
Enzymatic Peeling ◽  
Commercial Enzymes ◽  
Flow Filtration

The present work evaluates the possibility of using cross-flow filtration to recover enzymatic activities from commercial enzymes used for peeling mandarin segments. Two ceramic membranes of different pore size and molecular weight cut-off were assayed. The membrane of 40 kDa molecular weight cut-off provided better separation of enzymes and carbohydrates than the membrane of 0.14 μm pore size, since the enzymes were readily retained in the retentate fraction, while carbohydrates easily passed into the permeate fraction. After separation, both fractions (enzymes and carbohydrates) could be further used.

Increasing the angiotensin converting enzyme inhibitory activity of goat milk hydrolysates by cross-flow filtration through ceramic membranes

2014 ◽  
Vol 56 (13) ◽  
pp. 3544-3553
Author(s):  
Francisco Javier Espejo-Carpio ◽  
Raúl Pérez-Gálvez ◽  
María del Carmen Almécija ◽  
Antonio Guadix ◽  
Emilia María Guadix
Keyword(s):  
Angiotensin Converting Enzyme ◽  
Inhibitory Activity ◽  
Cross Flow ◽  
Goat Milk ◽  
Ceramic Membranes ◽  
Converting Enzyme ◽  
Cross Flow Filtration ◽  
Flow Filtration
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