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Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study

Mansour Ahmed, Darren Oatley-Radcliffe Orcid Logo, Paul Williams Orcid Logo

DESALINATION AND WATER TREATMENT, Volume: 203, Pages: 11 - 34

Swansea University Authors: Darren Oatley-Radcliffe Orcid Logo, Paul Williams Orcid Logo

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DOI (Published version): 10.5004/dwt.2020.26210

Abstract

The reverse osmosis (RO) desalination process has increasingly been utilized with aim of producing drinking water from different marginal sources of water such as seawater, and brackish ground and surface water, due to water scarcity. Unfortunately, desalination applications are limited by the brine...

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Published in: DESALINATION AND WATER TREATMENT
ISSN: 1944-3994
Published: Desalination Publications 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55990
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spelling 2021-02-26T09:50:00.0577216 v2 55990 2021-01-07 Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study 6dfb5ec2932455c778a5aa168c18cffd 0000-0003-4116-723X Darren Oatley-Radcliffe Darren Oatley-Radcliffe true false 3ed8f1e5d997e0fcb256fb6501605cec 0000-0003-0511-4659 Paul Williams Paul Williams true false 2021-01-07 CHEG The reverse osmosis (RO) desalination process has increasingly been utilized with aim of producing drinking water from different marginal sources of water such as seawater, and brackish ground and surface water, due to water scarcity. Unfortunately, desalination applications are limited by the brine disposal challenges including the adverse impact of brine on the surrounding environment. Therefore, this paper is focused on the technical evaluation of falling film freeze crystallization (FFFC) technology for treating and concentrating RO brine. An industrial pilot plant using the FFFC process was tested and assessed for concentrating RO brine in this study. The experimental results showed that the crystallization experiments using a feed stage (without the sweating process) and at the operating end-point heat transfer medium (HTM) temperature of –6°C, achieved a salt rejection ratio and water recovery ratio of 56.6% and 49.8% respectively. Whereas at the endpoint HTM temperature of –24°C, the salt rejection ratio and water recovery ratios were 24.5% and 84.6% respectively. The multi-stage process experiments using feed and rectification stages (without the sweating process) achieved a salt rejection and product water recovery ratio of 46.89% and 64.24% respectively. By using a multi-stage process including feed, rectification, and stripping stages (with the sweating process), the salt rejection and product water recovery ratio reached 70.68% and 50.15% respectively. In general, the results showed that the FFFC technology, using a single freezing stage and without the sweating process, would be an ideal treatment system for concentrating RO brine and to produce saline water to near seawater quality that can be used directly as feed water for a RO plant. The research proved that the investigated FFFC process can be considered as a great solution available for brine concentration and as an alternative for reducing the environmental impact of the large volume of waste streams from coastal and inland desalination plants. Journal Article DESALINATION AND WATER TREATMENT 203 11 34 Desalination Publications 1944-3994 1 11 2020 2020-11-01 10.5004/dwt.2020.26210 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2021-02-26T09:50:00.0577216 2021-01-07T11:12:35.9511208 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Mansour Ahmed 1 Darren Oatley-Radcliffe 0000-0003-4116-723X 2 Paul Williams 0000-0003-0511-4659 3 55990__19374__d3570fc2cde04ea7baf1da50c8c9d67f.pdf 55990.pdf 2021-02-26T09:49:05.3572787 Output 810647 application/pdf Accepted Manuscript true 2021-11-01T00:00:00.0000000 false eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study
spellingShingle Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study
Darren Oatley-Radcliffe
Paul Williams
title_short Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study
title_full Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study
title_fullStr Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study
title_full_unstemmed Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study
title_sort Reverse osmosis brine concentration using falling film freeze crystallisation technology: a pilot-scale study
author_id_str_mv 6dfb5ec2932455c778a5aa168c18cffd
3ed8f1e5d997e0fcb256fb6501605cec
author_id_fullname_str_mv 6dfb5ec2932455c778a5aa168c18cffd_***_Darren Oatley-Radcliffe
3ed8f1e5d997e0fcb256fb6501605cec_***_Paul Williams
author Darren Oatley-Radcliffe
Paul Williams
author2 Mansour Ahmed
Darren Oatley-Radcliffe
Paul Williams
format Journal article
container_title DESALINATION AND WATER TREATMENT
container_volume 203
container_start_page 11
publishDate 2020
institution Swansea University
issn 1944-3994
doi_str_mv 10.5004/dwt.2020.26210
publisher Desalination Publications
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description The reverse osmosis (RO) desalination process has increasingly been utilized with aim of producing drinking water from different marginal sources of water such as seawater, and brackish ground and surface water, due to water scarcity. Unfortunately, desalination applications are limited by the brine disposal challenges including the adverse impact of brine on the surrounding environment. Therefore, this paper is focused on the technical evaluation of falling film freeze crystallization (FFFC) technology for treating and concentrating RO brine. An industrial pilot plant using the FFFC process was tested and assessed for concentrating RO brine in this study. The experimental results showed that the crystallization experiments using a feed stage (without the sweating process) and at the operating end-point heat transfer medium (HTM) temperature of –6°C, achieved a salt rejection ratio and water recovery ratio of 56.6% and 49.8% respectively. Whereas at the endpoint HTM temperature of –24°C, the salt rejection ratio and water recovery ratios were 24.5% and 84.6% respectively. The multi-stage process experiments using feed and rectification stages (without the sweating process) achieved a salt rejection and product water recovery ratio of 46.89% and 64.24% respectively. By using a multi-stage process including feed, rectification, and stripping stages (with the sweating process), the salt rejection and product water recovery ratio reached 70.68% and 50.15% respectively. In general, the results showed that the FFFC technology, using a single freezing stage and without the sweating process, would be an ideal treatment system for concentrating RO brine and to produce saline water to near seawater quality that can be used directly as feed water for a RO plant. The research proved that the investigated FFFC process can be considered as a great solution available for brine concentration and as an alternative for reducing the environmental impact of the large volume of waste streams from coastal and inland desalination plants.
published_date 2020-11-01T04:10:35Z
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