scholarly journals Influence of Membrane Properties on Pineapple Wine Clarification and Fouling Behavior

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
W. Youravong ◽  
M. Phukdeekhong ◽  
P. Taksinpatanapong
Keyword(s):  
Pore Size ◽  
Membrane Fouling ◽  
Polyvinylidene Fluoride ◽  
Pilot Scale ◽  
Membrane Properties ◽  
Permeate Flux ◽  
Membrane Pore ◽  
Dead End ◽  
Membrane Pore Size ◽  
Stirred Cell

The experiment was carried out to investigate the influence of membrane pore size and hydrophobicity on the quality of clarified pineapple wine and fouling characteristics, using stirred cell dead–end microfiltration. The test membranes were mixed cellulose acetate (MCE, pore size 0.45 and 0.22 μm), modified polyvinylidene fluoride (MPVDF, 0.22 μm) and polyethersulfone (PESF, 0.22 μm). It was found that all types of membrane successfully clarified the pineapple wine. The membrane pore size and hydrophobicity played an importance role in membrane fouling, both reversible and irreversible. Regarding the permeate flux and fouling, 0.45 μm MCE was the most suitable for pineapple wine clarification. However, intensive organoleptic test with pilot scale would be needed.

scholarly journals Effect of carbon nanotubes loading and pressure on the performance of a polyethersulfone (PES)/carbon nanotubes (CNT) membrane

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mlungisi Martin Ngoma ◽  
Machodi Mathaba ◽  
Kapil Moothi
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Pore Size ◽  
Industrial Wastewater ◽  
Inversion Method ◽  
Permeate Flux ◽  
Membrane Pore ◽  
Membrane Pore Size ◽  
Stirred Cell ◽  
Pes Membrane

AbstractThis paper focuses on modifying a PES membrane with acid-functionalised carbon nanotubes (CNT) for industrial wastewater treatment. Embedding acid functionalised carbon nanotubes (CNTs) within the membrane matrix would increase the membrane flux by increasing the membrane pore size and surface area, rejection and thermal stability. Pure PES membranes were prepared by phase inversion method and infused with CNTs at 2.5, 5, 7.5 and 10 wt% loading to fabricate PES/2.5 wt% CNT, PES/5 wt% CNT, PES/7.5 wt% CNT and PES/10 wt% CNT membranes respectively. Characterisation was performed using Transmission Electron Microscopy (TEM) to determine CNT morphology, X-ray Diffraction (XRD) to determine the functional groups attached to CNTs, Thermogravimetric Analysis (TGA) to determine the thermal stability of the membranes, Scanning Electron Microscope (SEM) to determine membrane morphology, Bunauer-Emmett-Teller (BET) method to obtain pore size information and Contact Angle (CA) to determine the membrane hydrophilicity. Membrane performance was then evaluated with a dead-end stirred cell using industrial wastewater containing traces of Cu, Fe, Ni, Zn and Cl. Permeate flux results showed a direct proportion relationship with increasing CNT loading and increasing pressure (100 kPa, 300 kPa, 500 kPa, 700 kPa, 900 kPa and 1100 kPa). PES/5 wt% CNT membrane showed the most enhanced performance compared to the other membranes, achieving reasonably high flux of 43.7 L/m2h and rejection of 89.6% Cu, 100% Fe, 90.5% Ni, 68.8% Zn and 99.99% Cl at 300 kPa. The results obtained showed that the PES membrane embedded with functionalised CNTs could be used for the treatment of industrial wastewater.

Comparative Assessment of Membrane Fouling Propensity Using Colloidal Silica as Foulant

2012 ◽  
Vol 209-211 ◽  
pp. 1995-1998 ◽  
Author(s):  
Chai Hoon Koo ◽  
Abdul Wahab Mohammad ◽  
Fatihah Suja' ◽  
Meor Zainal Meor Talib
Keyword(s):  
Membrane Fouling ◽  
Polyvinylidene Fluoride ◽  
Colloidal Silica ◽  
Crossflow Filtration ◽  
Membrane Pore ◽  
Dead End ◽  
Silica Suspension ◽  
Index Tests ◽  
Membrane Pore Size ◽  
Modified Fouling Index

Other than silt density index (SDI), modified fouling index (MFI) is claimed as one of most useful fouling predictive tools in the practice of reverse osmosis. In this study, the effect of colloidal silica particles on the MFI value with the presence of crossflow sampler (CFS) cell at the upstream of MFI setup was systematically investigated. Colloidal silica with the particle size ranging from 70-100 nm was used as the model foulant in this experiment. The feed silica suspension was 0, 50, and 200 mg/L. The effect of membrane pore size as the test membrane in the dead-end cell on the fouling indices was also studied. Polyvinylidene fluoride (PVDF) membranes with molecular weight cut-offs of 150 and 100 kDa were employed. As predicted, the experiment results demonstrated that the fouling indices increased significantly as the feed silica concentration increased. The CFS-MFI values were always lower than the MFI in all the fouling index tests due to the shear force effect generated under the crossflow filtration mode. The fouling index generated from PVDF100 was higher than that of PVDF150 due to the retention of smaller particles. For this reason, PVDF100 membrane was preferred to be used as the test membrane for fouling index tests using colloidal silica over the PVDF150.

Antifouling Property and Morphology of Polyethersulfone Membranes Blended with Bio-Based Amphiphilic Polymer Additives

2019 ◽  
Vol 824 ◽  
pp. 38-44
Author(s):  
Yupin Phuphuak ◽  
Thidarat Loythaworn
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Membrane Fouling ◽  
Water Adsorption ◽  
Membrane Properties ◽  
Water Contact ◽  
Membrane Pore ◽  
Low Protein ◽  
Separation Membrane ◽  
Membrane Pore Size

In this work, polyethersulfone (PES) was blended with bio-based polymers, PLA (hydrophobic polymer) and PEG (hydrophilic polymer), in order to improve the antifouling properties of PES membranes. This was done by way of non-solvent induced phase separation. Membrane properties such as morphology, hydrophilicity/hydrophobicity, adsorption fouling and mechanical properties were characterized. All blended membranes displayed higher hydrophilicity than that of pristine PES. This was confirmed by lower water contact angle and higher water adsorption. It was found that membranes with 5 wt% PLA/PEG gave a water contact angle of 65.1° and water adsorption for 4.94. These were the best values obtained. These modifications yielded low protein adsorption leading to reduce membrane fouling. Adding a greater amount of PLA/PEG reduced the membrane pore size, enhanced hydrophilicity and improved the antifouling capability

scholarly journals Effects of mass retention of dissolved organic matter and membrane pore size on membrane fouling and flux decline

2009 ◽  
Vol 43 (2) ◽  
pp. 389-394 ◽  
Author(s):  
Cheng-Fang Lin ◽  
Angela Yu-Chen Lin ◽  
Panchangam Sri Chandana ◽  
Chao-Yuan Tsai
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Pore Size ◽  
Membrane Fouling ◽  
Membrane Pore ◽  
Flux Decline ◽  
Membrane Pore Size

The effect of apple cider characteristics and membrane pore size on membrane fouling

LWT ◽  
2015 ◽  
Vol 64 (2) ◽  
pp. 974-979 ◽  
Author(s):  
Dongjun Zhao ◽  
Evonne Lau ◽  
Shan Huang ◽  
Carmen I. Moraru
Keyword(s):  
Pore Size ◽  
Membrane Fouling ◽  
Membrane Pore ◽  
Apple Cider ◽  
Membrane Pore Size

scholarly journals Microfiltration of distillery stillage: Influence of membrane pore size

2012 ◽  
pp. 217-224 ◽  
Author(s):  
Vesna Vasic ◽  
Marina Sciban ◽  
Aleksandar Jokic ◽  
Jelena Prodanovic ◽  
Dragana Kukic
Keyword(s):  
Pore Size ◽  
Food Industry ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Ceramic Membranes ◽  
Permeate Flux ◽  
Filtration Process ◽  
Waste Products ◽  
Membrane Pore ◽  
Membrane Pore Size

Stillage is one of the most polluted waste products of the food industry. Beside large volume, the stillage contains high amount of suspended solids, high values of chemical oxygen demand and biological oxygen demand, so it should not be discharged in the nature before previous purification. In this work, three ceramic membranes for microfiltration with different pore sizes were tested for stillage purification in order to find the most suitable membrane for the filtration process. Ceramic membranes with a nominal pore size of 200 nm, 450 nm and 800 nm were used for filtration. The influence of pore size on permeate flux and removal efficiency was investigated. A membrane with the pore size of 200 nm showed the best filtration performance so it was chosen for the microfiltration process.

A new design of microfiltration system and application to wastewater treatment

2000 ◽  
Vol 41 (10-11) ◽  
pp. 181-188
Author(s):  
D.J. Chang ◽  
S.H. Chen ◽  
C.Y. Chang ◽  
S.S. Lin ◽  
J.S. Chang
Keyword(s):  
Pore Size ◽  
Membrane Fouling ◽  
Cross Flow ◽  
Reverse Direction ◽  
Feed Concentration ◽  
Force System ◽  
Concentrated Suspension ◽  
Membrane Pore ◽  
Stock Tank ◽  
Membrane Pore Size

A new microfiltration system with two sets of dead-end membrane cells and driven by a piston force system was designed in this study. In this system, suction of the filtrate was through the membrane in the reverse direction with a piston to backwash and reduce membrane fouling. In addition, after a few forward-reverse filtration cycles, the concentrated suspension of particles or solute on the retentate side was discharged into the stock tank under the cross flow condition. For maximizing the filtrate volume, it was found that the optimum times for forward and reverse filtration were 90 s and 3 s respectively, and the discharge frequency of retentate was 1 time per cycle. Moreover, it was also found that the filtrate volume increased with an increase in particle size and membrane pore size but decreased with an increase in feed concentration. Furthermore, an optimal filtrate volume existed on effecting the pressure drop. Finally, it could be used efficiently to treat and recycle the backwash wastewater from a rapid sand filter by a membrane with pore size of 0.1 and 0.22 μm.

scholarly journals Development of Polydopamine Forward Osmosis Membranes with Low Reverse Salt Flux

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 94
Author(s):  
Pelin Oymaci ◽  
Kitty Nijmeijer ◽  
Zandrie Borneman
Keyword(s):  
Membrane Fouling ◽  
Forward Osmosis ◽  
Salt Flux ◽  
Membrane Properties ◽  
Antifouling Coating ◽  
Dead End ◽  
Reverse Salt Flux ◽  
Stirred Cell ◽  
Coating Temperature

Application of forward osmosis (FO) is limited due to membrane fouling and, most importantly, high reverse salt fluxes that deteriorate the concentrated product. Polydopamine (PDA) is a widely used, easily applicable, hydrophilic, adhesive antifouling coating. Among the coating parameters, surprisingly, the effect of PDA coating temperature on the membrane properties has not been well studied. Polyethersulfone (PES) 30 kDa ultrafiltration membranes were PDA-coated with varying dopamine concentrations (0.5–3 g/L) and coating temperatures (4–55 °C). The quality of the applied coating has been determined by surface properties, water permeability and reverse salt flux using a 1.2 M MgSO4 draw solution. The coating thickness increased both with the dopamine concentration and coating temperature, the latter having a remarkably stronger effect resulting in a higher PDA deposition speed and smaller PDA aggregates. In dead-end stirred cell, the membranes coated at 55 °C with 2.0 g/L dopamine showed NaCl and MgSO4 retentions of 41% and 93%, respectively. In crossflow FO, a low reverse MgSO4 flux (0.34 g/m2·h) was found making a very low specific reverse salt flux (Js/Jw) of 0.08 g/L, which outperformed the commercial CTA FO membranes, showing the strong benefit of high temperature PDA-coated PES membranes to assure high quality products.

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