Hybrid forward osmosis-reverse osmosis for wastewater reuse and seawater desalination: Understanding the optimal feed solution to minimise fouling

Volpin, F; Fons, E; Chekli, L; Kim, JE; Jang, A; Shon, HK

Hybrid forward osmosis-reverse osmosis for wastewater reuse and seawater desalination: Understanding the optimal feed solution to minimise fouling

Volpin, F

Fons, E Chekli, L

Kim, JE Jang, A Shon, HK

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Publication Type:: Journal Article
Citation:: Process Safety and Environmental Protection, 2018, 117 pp. 523 - 532
Issue Date:: 2018-07-01

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Field	Value	Language
dc.contributor.author	Volpin, F https://orcid.org/0000-0002-6053-3605	en_US
dc.contributor.author	Fons, E	en_US
dc.contributor.author	Chekli, L https://orcid.org/0000-0002-9353-943X	en_US
dc.contributor.author	Kim, JE	en_US
dc.contributor.author	Jang, A	en_US
dc.contributor.author	Shon, HK https://orcid.org/0000-0002-3777-7169	en_US
dc.date.available	2020-07-01T19:05:11Z
dc.date.issued	2018-07-01	en_US
dc.identifier.citation	Process Safety and Environmental Protection, 2018, 117 pp. 523 - 532	en_US
dc.identifier.issn	0957-5820	en_US
dc.identifier.uri	http://hdl.handle.net/10453/131950
dc.description.abstract	© 2018 Institution of Chemical Engineers To enhance the seawater desalination energy efficiency forward osmosis – reverse osmosis (FO-RO) hybrid system has recently been developed. In this process, the FO “pre-treatment” step is designed to use seawater (SW) as draw solution to filter the wastewater (WW) while reducing the seawater osmotic pressure. Thereby reducing the operating pressure of the RO to desalinate the diluted SW. However, membrane fouling is a major issue that needs to be addressed. Proper selection of suitable WWs is necessary before proceeding with large-scale FO-RO desalination plants. In this study, long-term experiments were carried out, using state-of-the-art FO membrane, using real WW and SW solutions. A combination of water flux modelling and membrane characterisation were used to assess the degree of membrane fouling and the impact on the process performance. Initial water flux as high as 22.5 Lm−2 h−1 was observed when using secondary effluent. It was also found that secondary effluent causes negligible flux decline. On the other hand, biologically treated wastewater and primary effluent caused mild and severe flux decline respectively (25% and 50% of flux decline after 80 hours, compared to no-fouling conditions). Ammonia leakage to the diluted seawater was also measured, concluding that, if biologically treated wastewater is used as feed, the final NH4+ concentration in the draw is likely to be negligible.	en_US
dc.relation	http://purl.org/au-research/grants/arc/IH170100009
dc.relation.ispartof	Process Safety and Environmental Protection	en_US
dc.relation.isbasedon	10.1016/j.psep.2018.05.006	en_US
dc.subject.classification	Strategic, Defence & Security Studies	en_US
dc.subject.classification	Chemical Engineering	en_US
dc.title	Hybrid forward osmosis-reverse osmosis for wastewater reuse and seawater desalination: Understanding the optimal feed solution to minimise fouling	en_US
dc.type	Journal Article
utslib.citation.volume	117	en_US
utslib.for	0904 Chemical Engineering	en_US
utslib.for	0914 Resources Engineering and Extractive Metallurgy	en_US
utslib.for	0102 Applied Mathematics	en_US
utslib.for	0911 Maritime Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	open_access	*
pubs.publication-status	Published	en_US
pubs.volume	117	en_US

Abstract:

© 2018 Institution of Chemical Engineers To enhance the seawater desalination energy efficiency forward osmosis – reverse osmosis (FO-RO) hybrid system has recently been developed. In this process, the FO “pre-treatment” step is designed to use seawater (SW) as draw solution to filter the wastewater (WW) while reducing the seawater osmotic pressure. Thereby reducing the operating pressure of the RO to desalinate the diluted SW. However, membrane fouling is a major issue that needs to be addressed. Proper selection of suitable WWs is necessary before proceeding with large-scale FO-RO desalination plants. In this study, long-term experiments were carried out, using state-of-the-art FO membrane, using real WW and SW solutions. A combination of water flux modelling and membrane characterisation were used to assess the degree of membrane fouling and the impact on the process performance. Initial water flux as high as 22.5 Lm−2 h−1 was observed when using secondary effluent. It was also found that secondary effluent causes negligible flux decline. On the other hand, biologically treated wastewater and primary effluent caused mild and severe flux decline respectively (25% and 50% of flux decline after 80 hours, compared to no-fouling conditions). Ammonia leakage to the diluted seawater was also measured, concluding that, if biologically treated wastewater is used as feed, the final NH4+ concentration in the draw is likely to be negligible.

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http://hdl.handle.net/10453/131950