euroscholars final presentation
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fTRANSCRIPT
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Flux and Retention Behavior of Superhydrophiliic Loose Nanofiltration Membranes
Nicole Bernstein
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Agenda
Purpose Methodology
Membranes
Foulants
Results
Acknowledgements
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Membrane technology offers a possibility for the economic purification of natural and industrial water sources
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Membrane technology offers a possibility for the economic purification of natural and industrial water sources
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The purpose of this study was to study the performance of membranes with high fouling resistance and low NaCl rejection
Sepro NF 6 Sepro NF 2A
MWCO (Da) 847 529
Permeability (L∙m-2∙h-1∙bar-1) at 25 oC 16.65 10.13
Salt rejection (NaCl, %) 7.34 21.23
pH for isoelectric point 5.06 3.78
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Three foulants were chosen due to their representativeness of common contaminants from various sources
HUMIC ACID
ALGINIC ACID
BOVINE SERUM ALBUMIN66.5 kDa
10-600 kDa
5-200 kDa
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The flux and retention of the membranes were tested in a lab-scale cross flow filtration unit
permeate permeate
pumpfeed
solution
NF6 NF2A
Pretentate retentate
P
6 bar25 oC
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The flow rate behavior in the cross flow unit was simulated using COMSOL
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The following factors were considered when testing the performance of the membranes
Minimal flux decline with changes in:• Foulant concentration• pH • Ionic strength
123
High retention of organic matter
Low salt retention of NaCl
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The increase in foulant concentration resulted in a minimal flux decline
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The increase in foulant concentration resulted in a minimal flux decline
Membrane as observed after humic acid trials
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Decreasing pH had the most effect on the declining membrane performance
Humic Acid 50 ppm
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Decreasing pH had the most effect on the declining membrane performance
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The effect of ionic strength was tested with three different salts: NaCl, MgCl2, and CaCl2
Humic Acid 50 ppm
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The effect of ionic strength was tested with three different salts: NaCl, MgCl2, and CaCl2
NaCl
MgCl2CaCl2
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The retention of humic acid was consistantly high (above 99.3%) for all trials
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The expected low NaCl rejection of the membrane was seen at high NaCl concentrations
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Further data analysis and comparison with commercial membranes will allow us to better understand the membrane performance
Minimal flux decline with changes in:• Foulant concentration• pH • Ionic strength
123
High retention of organic matter
Low salt retention of NaCl
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Acknowledgements
Thank you to Professor Bart Van der Bruggen for the opportunity to travel to K. U. Leuven.
Thank you to Jiuyang Lin for guidance throughout the semester.