A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination
In recent years, brine management in seawater reverse osmosis (SWRO) desalination has been more emphasized to reduce environmental hazards and recover valuable resources. However, current brine treatment methods are often hindered by the high brine concentration and energy consumption. To mitigate t...
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sg-ntu-dr.10356-1679132023-05-24T15:34:17Z A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination Truong, Vinh Hien Chong, Tzyy Haur Interdisciplinary Graduate School (IGS) School of Civil and Environmental Engineering 13th International Congress on Membranes and Membrane Processes (ICOM 2023) Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Engineering::Environmental engineering::Water treatment Desalination Brine Management In recent years, brine management in seawater reverse osmosis (SWRO) desalination has been more emphasized to reduce environmental hazards and recover valuable resources. However, current brine treatment methods are often hindered by the high brine concentration and energy consumption. To mitigate these challenges, this work applies a diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process, which aims to achieve divalent-monovalent ion separation in the pre-treatment step prior to RO. The diafiltration process is to enhance the separation performance of NF stage, while the RO stage is to produce the desalinated water and the diluent required by the diafiltration process. This study would justify the benefits of pre-treatment method (i.e., DiaNF-RO) over post-treatment method (i.e., RO-DiaNF), Fig. 1, in brine management by comparing the processes in 3 aspects (i.e., performance, operation, economic) via practical simulations, including pressure drop within module and concentration polarization (CP) effect, at the same number of stages and system water recovery, under similar input conditions such as NF/RO pressures and NF recovery rates. As shown in Table 1, compared to RO-DiaNF, the DiaNF-RO has better Mg-Na ion separation factor (SF) in both NF and RO brines; higher Na dilution in NF brine; lower RO area requirement; larger potential to operate at higher pressure and recovery due to lower osmotic pressure difference at membrane stages; less total operating cost especially with more stages due to more RO area saving. Overall, the pre-treatment DiaNF-RO achieves better results in performance, operation, and economic than the conventional post-treatment RO-DiaNF. National Research Foundation (NRF) Public Utilities Board (PUB) This research is supported by the National Research Foundation, Singapore, and PUB, Singapore’s National Water Agency under its RIE2025 Urban Solutions and Sustainability (USS) (Water) Centre of Excellence (CoE) Programme which provides funding to the Nanyang Environment & Water Research Institute (NEWRI) of the Nanyang Technological University, Singapore (NTU). 2023-05-24T05:04:36Z 2023-05-24T05:04:36Z 2023 Conference Paper Truong, V. H. & Chong, T. H. (2023). A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination. 13th International Congress on Membranes and Membrane Processes (ICOM 2023). https://hdl.handle.net/10356/167913 https://icom2023.jp/ en © 2023 ICOM. All Rights Reserved. application/pdf |
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Engineering::Environmental engineering::Water treatment Desalination Brine Management Truong, Vinh Hien Chong, Tzyy Haur A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination |
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In recent years, brine management in seawater reverse osmosis (SWRO) desalination has been more emphasized to reduce environmental hazards and recover valuable resources. However, current brine treatment methods are often hindered by the high brine concentration and energy consumption. To mitigate these challenges, this work applies a diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process, which aims to achieve divalent-monovalent ion separation in the pre-treatment step prior to RO. The diafiltration process is to enhance the separation performance of NF stage, while the RO stage is to produce the desalinated water and the diluent required by the diafiltration process. This study would justify the benefits of pre-treatment method (i.e., DiaNF-RO) over post-treatment method (i.e., RO-DiaNF), Fig. 1, in brine management by comparing the processes in 3 aspects (i.e., performance, operation, economic) via practical simulations, including pressure drop within module and concentration polarization (CP) effect, at the same number of stages and system water recovery, under similar input conditions such as NF/RO pressures and NF recovery rates.
As shown in Table 1, compared to RO-DiaNF, the DiaNF-RO has better Mg-Na ion separation factor (SF) in both NF and RO brines; higher Na dilution in NF brine; lower RO area requirement; larger potential to operate at higher pressure and recovery due to lower osmotic pressure difference at membrane stages; less total operating cost especially with more stages due to more RO area saving. Overall, the pre-treatment DiaNF-RO achieves better results in performance, operation, and economic than the conventional post-treatment RO-DiaNF. |
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Interdisciplinary Graduate School (IGS) |
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Interdisciplinary Graduate School (IGS) Truong, Vinh Hien Chong, Tzyy Haur |
format |
Conference or Workshop Item |
author |
Truong, Vinh Hien Chong, Tzyy Haur |
author_sort |
Truong, Vinh Hien |
title |
A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination |
title_short |
A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination |
title_full |
A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination |
title_fullStr |
A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination |
title_full_unstemmed |
A diafiltration-nanofiltration-reverse osmosis (DiaNF-RO) process for brine management in seawater reverse osmosis (SWRO) desalination |
title_sort |
diafiltration-nanofiltration-reverse osmosis (dianf-ro) process for brine management in seawater reverse osmosis (swro) desalination |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/167913 https://icom2023.jp/ |
_version_ |
1772826239278514176 |