Nanofiltration hollow fiber development for water softening

Polyvalent cations, probably Mg2+ and Ca2+ are the main predominant contributors in hard water. They build up on contact surfaces, damage water heaters and causing high soap consumption which is bad in economic sense. Nanofiltration (NF) is a relatively new development in membrane technology...

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Main Author: Goh, Sin Tee.
Other Authors: Wang Rong
Format: Final Year Project
Language:English
Published: 2013
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Online Access:http://hdl.handle.net/10356/51011
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-510112023-03-03T17:10:03Z Nanofiltration hollow fiber development for water softening Goh, Sin Tee. Wang Rong School of Civil and Environmental Engineering Singapore Membrane Technology Centre DRNTU::Engineering Polyvalent cations, probably Mg2+ and Ca2+ are the main predominant contributors in hard water. They build up on contact surfaces, damage water heaters and causing high soap consumption which is bad in economic sense. Nanofiltration (NF) is a relatively new development in membrane technology and still under development. NF is created with the ability to reject macromolecules and divalent ions effectively at a relatively moderate operating pressure by combining the attributes of Reverse Osmosis (RO) and Ultrafiltration (UF). However, there is no existing membrane in the market provides efficient removal of divalent ions while producing high water permeation flux. Therefore, it is needed to develop NF membranes for water softening. The author was involved in assisting in the development of high performance of NF hollow fiber membranes suitable for water softening. Membrane separation tends to offer lower operating and by-product disposal costs, consuming relatively low energy consumption compared to conventional methods. Dual layer nanofiltration hollow fibers were produced, modified by cross-linking to increase its density and selectivity. Different cross-linking conditions were modified to evaluate the effects caused on the dual layer NF HFs. The optimum conditions to achieve best performances in this project, i.e. permeability (22.40 LMH) and rejection (91%) using 1000ppm Magnesium Chloride (MgCl2) Aqueous Solution was to cross-link with 1wt% High Molecular Weight Polyethylenimines (HMW PEI) for 1hour and followed by 1wt% Polycyclic Aromatic Hydrocarbon (PAH). The cross-linked dual layer hollow fibers has great potential for further modification to enhance membrane for more efficient for removal of hardness in water treatment. Bachelor of Engineering (Environmental Engineering) 2013-01-02T09:02:11Z 2013-01-02T09:02:11Z 2012 2012 Final Year Project (FYP) http://hdl.handle.net/10356/51011 en Nanyang Technological University 27 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
spellingShingle DRNTU::Engineering
Goh, Sin Tee.
Nanofiltration hollow fiber development for water softening
description Polyvalent cations, probably Mg2+ and Ca2+ are the main predominant contributors in hard water. They build up on contact surfaces, damage water heaters and causing high soap consumption which is bad in economic sense. Nanofiltration (NF) is a relatively new development in membrane technology and still under development. NF is created with the ability to reject macromolecules and divalent ions effectively at a relatively moderate operating pressure by combining the attributes of Reverse Osmosis (RO) and Ultrafiltration (UF). However, there is no existing membrane in the market provides efficient removal of divalent ions while producing high water permeation flux. Therefore, it is needed to develop NF membranes for water softening. The author was involved in assisting in the development of high performance of NF hollow fiber membranes suitable for water softening. Membrane separation tends to offer lower operating and by-product disposal costs, consuming relatively low energy consumption compared to conventional methods. Dual layer nanofiltration hollow fibers were produced, modified by cross-linking to increase its density and selectivity. Different cross-linking conditions were modified to evaluate the effects caused on the dual layer NF HFs. The optimum conditions to achieve best performances in this project, i.e. permeability (22.40 LMH) and rejection (91%) using 1000ppm Magnesium Chloride (MgCl2) Aqueous Solution was to cross-link with 1wt% High Molecular Weight Polyethylenimines (HMW PEI) for 1hour and followed by 1wt% Polycyclic Aromatic Hydrocarbon (PAH). The cross-linked dual layer hollow fibers has great potential for further modification to enhance membrane for more efficient for removal of hardness in water treatment.
author2 Wang Rong
author_facet Wang Rong
Goh, Sin Tee.
format Final Year Project
author Goh, Sin Tee.
author_sort Goh, Sin Tee.
title Nanofiltration hollow fiber development for water softening
title_short Nanofiltration hollow fiber development for water softening
title_full Nanofiltration hollow fiber development for water softening
title_fullStr Nanofiltration hollow fiber development for water softening
title_full_unstemmed Nanofiltration hollow fiber development for water softening
title_sort nanofiltration hollow fiber development for water softening
publishDate 2013
url http://hdl.handle.net/10356/51011
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