Evaluation of fouling potential and power density in pressure retarded osmosis (PRO) by fouling index

Choi, Y; Vigneswaran, S; Lee, S

Evaluation of fouling potential and power density in pressure retarded osmosis (PRO) by fouling index

Choi, Y

Vigneswaran, S

Lee, S

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Publication Type:: Journal Article
Citation:: Desalination, 2016, 389 pp. 215 - 223
Issue Date:: 2016-07-01

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Field	Value	Language
dc.contributor.author	Choi, Y https://orcid.org/0000-0001-6267-1457	en_US
dc.contributor.author	Vigneswaran, S https://orcid.org/0000-0002-8117-4322	en_US
dc.contributor.author	Lee, S https://orcid.org/0000-0002-1407-142X	en_US
dc.date.issued	2016-07-01	en_US
dc.identifier.citation	Desalination, 2016, 389 pp. 215 - 223	en_US
dc.identifier.issn	0011-9164	en_US
dc.identifier.uri	http://hdl.handle.net/10453/42181
dc.description.abstract	© 2016 Elsevier B.V. Pressure retarded osmosis (PRO) is an osmotically-driven membrane process to utilize salinity gradient power (SGP), which is renewable energy originated from the different salt concentration between seawater and fresh water. However, PRO suffers from membrane fouling, leading to decreased water permeability and energy density. Although prediction of fouling is important for its mitigation and control, little information is available on fouling potential in PRO process. Accordingly, this study aims at the investigation of fouling propensity of PRO membranes under different conditions. Feed solutions that have different fouling potential were used in a laboratory-scale PRO system. Silt density index (SDI) and modified fouling index (MFI) were applied as indicators for assessing PRO membrane fouling. Results showed that the power density of PRO decreases with an increase of the fouling potential of the feed waters. MFI was proposed to be a fouling index for PRO because it showed a better correlation with the power density than SDI and turbidity. When MFI value is lower than 1400 s/L2, the efficiency is higher than 70%, indicating that 30% loss in energy recovery compared to the case with D.I. water. This suggests that pretreatment requirements for PRO may be determined based on MFI results.	en_US
dc.relation.ispartof	Desalination	en_US
dc.relation.isbasedon	10.1016/j.desal.2016.01.011	en_US
dc.subject.classification	Chemical Engineering	en_US
dc.title	Evaluation of fouling potential and power density in pressure retarded osmosis (PRO) by fouling index	en_US
dc.type	Journal Article
utslib.citation.volume	389	en_US
utslib.for	090404 Membrane and Separation Technologies	en_US
utslib.for	0907 Environmental Engineering	en_US
utslib.for	090407 Process Control and Simulation	en_US
utslib.for	03 Chemical Sciences	en_US
utslib.for	09 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
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	389	en_US

Abstract:

© 2016 Elsevier B.V. Pressure retarded osmosis (PRO) is an osmotically-driven membrane process to utilize salinity gradient power (SGP), which is renewable energy originated from the different salt concentration between seawater and fresh water. However, PRO suffers from membrane fouling, leading to decreased water permeability and energy density. Although prediction of fouling is important for its mitigation and control, little information is available on fouling potential in PRO process. Accordingly, this study aims at the investigation of fouling propensity of PRO membranes under different conditions. Feed solutions that have different fouling potential were used in a laboratory-scale PRO system. Silt density index (SDI) and modified fouling index (MFI) were applied as indicators for assessing PRO membrane fouling. Results showed that the power density of PRO decreases with an increase of the fouling potential of the feed waters. MFI was proposed to be a fouling index for PRO because it showed a better correlation with the power density than SDI and turbidity. When MFI value is lower than 1400 s/L2, the efficiency is higher than 70%, indicating that 30% loss in energy recovery compared to the case with D.I. water. This suggests that pretreatment requirements for PRO may be determined based on MFI results.

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http://hdl.handle.net/10453/42181