Fouling of membranes by biological macromolecules

Fouling of NF270, NF90 and XLE membranes by macromolecules, represented by three model protein foulants (lysozyme, Bovine Serum Albumin (BSA) and binary protein mixture (BSA-LYZ)), has been examined in this study. Effects of hydrodynamic conditions (initial flux and cross-flow velocity) and feed sol...

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Main Author: Tan, Chia Wen.
Other Authors: Tang Chuyang
Format: Final Year Project
Language:English
Published: 2010
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Online Access:http://hdl.handle.net/10356/38945
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-389452023-03-03T17:04:09Z Fouling of membranes by biological macromolecules Tan, Chia Wen. Tang Chuyang School of Civil and Environmental Engineering DRNTU::Engineering::Environmental engineering::Water treatment Fouling of NF270, NF90 and XLE membranes by macromolecules, represented by three model protein foulants (lysozyme, Bovine Serum Albumin (BSA) and binary protein mixture (BSA-LYZ)), has been examined in this study. Effects of hydrodynamic conditions (initial flux and cross-flow velocity) and feed solution composition (pH, ionic strength and calcium ions) on protein fouling were observed. Bench-scale cross-flow test unit was employed with baseline electrolyte of 10mM NaCl (unless otherwise specified) and foulant concentration 20mg/L at constant room temperature (26°C) for the fouling tests. Flux throughout the seven-day fouling experiment was recorded by data-logger to a computer terminal. Mass deposition of fouled membranes was evaluated by UV-absorbance method with UV-Visible Spectrometer at the end of fouling runs. In addition, salt rejection of NF270 membranes was calculated. From this study, significant flux decline was observed with initial flux higher than limiting flux. Higher pH of feed solution also promised greater flux decline and foulant deposition on NF270 with lysozyme as model foulant. On the other hand, higher ionic strength (100mM) and presence of Calcium (Ca2+) did not have significant impact on flux decline and lysozyme deposition on NF270. However, both seemed to reduce salt rejection of NF270. Under comparison, binary protein mixture (BSA-LYZ) resulted in most severe fouling. Nevertheless, an overall improvement for salt rejection was observed for all three model foulants. Finally, flux decline trends for XLE, NF90 and NF270 were found to converge ultimately which was likely due to foulant-deposited-foulant interactions rather than interactions between foulant and membranes. Bachelor of Engineering (Environmental Engineering) 2010-05-21T03:05:58Z 2010-05-21T03:05:58Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/38945 en Nanyang Technological University 53 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water treatment
spellingShingle DRNTU::Engineering::Environmental engineering::Water treatment
Tan, Chia Wen.
Fouling of membranes by biological macromolecules
description Fouling of NF270, NF90 and XLE membranes by macromolecules, represented by three model protein foulants (lysozyme, Bovine Serum Albumin (BSA) and binary protein mixture (BSA-LYZ)), has been examined in this study. Effects of hydrodynamic conditions (initial flux and cross-flow velocity) and feed solution composition (pH, ionic strength and calcium ions) on protein fouling were observed. Bench-scale cross-flow test unit was employed with baseline electrolyte of 10mM NaCl (unless otherwise specified) and foulant concentration 20mg/L at constant room temperature (26°C) for the fouling tests. Flux throughout the seven-day fouling experiment was recorded by data-logger to a computer terminal. Mass deposition of fouled membranes was evaluated by UV-absorbance method with UV-Visible Spectrometer at the end of fouling runs. In addition, salt rejection of NF270 membranes was calculated. From this study, significant flux decline was observed with initial flux higher than limiting flux. Higher pH of feed solution also promised greater flux decline and foulant deposition on NF270 with lysozyme as model foulant. On the other hand, higher ionic strength (100mM) and presence of Calcium (Ca2+) did not have significant impact on flux decline and lysozyme deposition on NF270. However, both seemed to reduce salt rejection of NF270. Under comparison, binary protein mixture (BSA-LYZ) resulted in most severe fouling. Nevertheless, an overall improvement for salt rejection was observed for all three model foulants. Finally, flux decline trends for XLE, NF90 and NF270 were found to converge ultimately which was likely due to foulant-deposited-foulant interactions rather than interactions between foulant and membranes.
author2 Tang Chuyang
author_facet Tang Chuyang
Tan, Chia Wen.
format Final Year Project
author Tan, Chia Wen.
author_sort Tan, Chia Wen.
title Fouling of membranes by biological macromolecules
title_short Fouling of membranes by biological macromolecules
title_full Fouling of membranes by biological macromolecules
title_fullStr Fouling of membranes by biological macromolecules
title_full_unstemmed Fouling of membranes by biological macromolecules
title_sort fouling of membranes by biological macromolecules
publishDate 2010
url http://hdl.handle.net/10356/38945
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