Alternative solution for pre-treatment of seawater for the desalination process

The applicability of novel low pressure nanofiltration (NF) membrane as a pre-treatment stage prior to reverse osmosis (RO) process for desalination of seawater was investigated in a laboratory-scale study. The performance of NF membrane and resultant permeate quality was tested and compared with th...

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Main Author: Goh, Qing Kai
Other Authors: Wang Rong
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/149923
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1499232021-05-20T04:35:28Z Alternative solution for pre-treatment of seawater for the desalination process Goh, Qing Kai Wang Rong School of Civil and Environmental Engineering Singapore Membrane Technology Centre RWang@ntu.edu.sg Engineering::Environmental engineering The applicability of novel low pressure nanofiltration (NF) membrane as a pre-treatment stage prior to reverse osmosis (RO) process for desalination of seawater was investigated in a laboratory-scale study. The performance of NF membrane and resultant permeate quality was tested and compared with that of ultrafiltration (UF) membrane. Salt rejection, total organic compounds (TOCs) rejection and overall flux performance of the NF and UF membranes using seawater as feed served as the basis of comparison for this study. Experiments conducted showed that the rejection of both salt and TOCs of NF membranes were much better than the UF membranes and displayed better flux performance during a continuous operation using seawater as feed. The average salt rejection of NF membrane was 3.99% at 2.5 bar while that of UF membrane was only at 0.42%. Additionally, at the same respective operating pressure, the NF membrane showed higher TOC rejection of 69.4% to that of UF membrane which was only 14.9%. The NF membranes were able to sustain its original flux performance at 2.5 bar much longer than the UF membrane could at 0.25 bar. Following that, collection of NF permeate was done continuously from the NF membrane, with seawater as feed. Subsequently, the NF permeate was fed into a closed-loop seawater reverse osmosis (SWRO) process, with resultant RO permeate compared to the quality of permeate of an integrated UF + RO system that was collected in previous study. Lastly, various membrane cleaning methods were also evaluated to determine which of the tested methods showed highest flux recovery in the NF membrane. From the tests conducted, it was concluded that backwashing with sodium hydroxide showed the highest flux recovery. Bachelor of Engineering (Environmental Engineering) 2021-05-20T04:35:28Z 2021-05-20T04:35:28Z 2021 Final Year Project (FYP) Goh, Q. K. (2021). Alternative solution for pre-treatment of seawater for the desalination process. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/149923 https://hdl.handle.net/10356/149923 en EN-40 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering
spellingShingle Engineering::Environmental engineering
Goh, Qing Kai
Alternative solution for pre-treatment of seawater for the desalination process
description The applicability of novel low pressure nanofiltration (NF) membrane as a pre-treatment stage prior to reverse osmosis (RO) process for desalination of seawater was investigated in a laboratory-scale study. The performance of NF membrane and resultant permeate quality was tested and compared with that of ultrafiltration (UF) membrane. Salt rejection, total organic compounds (TOCs) rejection and overall flux performance of the NF and UF membranes using seawater as feed served as the basis of comparison for this study. Experiments conducted showed that the rejection of both salt and TOCs of NF membranes were much better than the UF membranes and displayed better flux performance during a continuous operation using seawater as feed. The average salt rejection of NF membrane was 3.99% at 2.5 bar while that of UF membrane was only at 0.42%. Additionally, at the same respective operating pressure, the NF membrane showed higher TOC rejection of 69.4% to that of UF membrane which was only 14.9%. The NF membranes were able to sustain its original flux performance at 2.5 bar much longer than the UF membrane could at 0.25 bar. Following that, collection of NF permeate was done continuously from the NF membrane, with seawater as feed. Subsequently, the NF permeate was fed into a closed-loop seawater reverse osmosis (SWRO) process, with resultant RO permeate compared to the quality of permeate of an integrated UF + RO system that was collected in previous study. Lastly, various membrane cleaning methods were also evaluated to determine which of the tested methods showed highest flux recovery in the NF membrane. From the tests conducted, it was concluded that backwashing with sodium hydroxide showed the highest flux recovery.
author2 Wang Rong
author_facet Wang Rong
Goh, Qing Kai
format Final Year Project
author Goh, Qing Kai
author_sort Goh, Qing Kai
title Alternative solution for pre-treatment of seawater for the desalination process
title_short Alternative solution for pre-treatment of seawater for the desalination process
title_full Alternative solution for pre-treatment of seawater for the desalination process
title_fullStr Alternative solution for pre-treatment of seawater for the desalination process
title_full_unstemmed Alternative solution for pre-treatment of seawater for the desalination process
title_sort alternative solution for pre-treatment of seawater for the desalination process
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/149923
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