Emerging investigators series: A steric pore-flow model to predict the transport of small and uncharged solutes through a reverse osmosis membrane

Takeuchi, H; Tanaka, H; Nghiem, LD; Fujioka, T

Emerging investigators series: A steric pore-flow model to predict the transport of small and uncharged solutes through a reverse osmosis membrane

Takeuchi, H Tanaka, H Nghiem, LD

Fujioka, T

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Publication Type:: Journal Article
Citation:: Environmental Science: Water Research and Technology, 2018, 4 (4), pp. 493 - 504
Issue Date:: 2018-04-01

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Field	Value	Language
dc.contributor.author	Takeuchi, H	en_US
dc.contributor.author	Tanaka, H	en_US
dc.contributor.author	Nghiem, LD https://orcid.org/0000-0002-9039-5792	en_US
dc.contributor.author	Fujioka, T	en_US
dc.date.issued	2018-04-01	en_US
dc.identifier.citation	Environmental Science: Water Research and Technology, 2018, 4 (4), pp. 493 - 504	en_US
dc.identifier.issn	2053-1400	en_US
dc.identifier.uri	http://hdl.handle.net/10453/134083
dc.description.abstract	© 2018 The Royal Society of Chemistry. This study proposed a new approach to apply the steric pore-flow model to predict the rejection of eight N-nitrosamines and seven VOCs that are of great concern in potable water reuse through an RO membrane. In this approach, solute rejection is predicted by estimating the free-volume hole-size. The free-volume hole-radius was determined with pure water permeability of a membrane and a single reference compound-N-nitrosodimethylamine (NDMA)-by minimizing the variance between the experimentally obtained and calculated NDMA rejection values at the permeate flux of 20 L m-2 h-1. The obtained free-volume hole-radius of the ESPA2 RO membrane was 0.348 nm, which was larger than the value previously determined by positron annihilation lifetime spectroscopy (PALS) analysis (0.289 nm). The model incorporated with the estimated free-volume hole-radius could accurately predict the rejection of eight N-nitrosamines under a range of permeate flux (2.6-20 L m-2 h-1). The model was also validated using experimentally obtained VOC rejection values. The predicted VOC rejections at the permeate flux of 20 L m-2 h-1 were almost identical to their experimentally obtained rejections. However, VOC rejection prediction at a lower permeate flux was less accurate. Further improvement and validation of the model with a variety of trace organic chemicals is required to allow for a more accurate prediction. The model was also validated using the membrane free-volume hole-radius value previously obtained from PALS analysis. Using PALS data resulted in some over-prediction. The results suggest that additional adjustment is necessary when using data from PALS analysis for predicting the rejection of small and uncharged solutes.	en_US
dc.relation.ispartof	Environmental Science: Water Research and Technology	en_US
dc.relation.isbasedon	10.1039/c7ew00194k	en_US
dc.title	Emerging investigators series: A steric pore-flow model to predict the transport of small and uncharged solutes through a reverse osmosis membrane	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.for	0904 Chemical Engineering	en_US
utslib.for	0399 Other Chemical Sciences	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0907 Environmental 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	open_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	4	en_US

Abstract:

© 2018 The Royal Society of Chemistry. This study proposed a new approach to apply the steric pore-flow model to predict the rejection of eight N-nitrosamines and seven VOCs that are of great concern in potable water reuse through an RO membrane. In this approach, solute rejection is predicted by estimating the free-volume hole-size. The free-volume hole-radius was determined with pure water permeability of a membrane and a single reference compound-N-nitrosodimethylamine (NDMA)-by minimizing the variance between the experimentally obtained and calculated NDMA rejection values at the permeate flux of 20 L m-2 h-1. The obtained free-volume hole-radius of the ESPA2 RO membrane was 0.348 nm, which was larger than the value previously determined by positron annihilation lifetime spectroscopy (PALS) analysis (0.289 nm). The model incorporated with the estimated free-volume hole-radius could accurately predict the rejection of eight N-nitrosamines under a range of permeate flux (2.6-20 L m-2 h-1). The model was also validated using experimentally obtained VOC rejection values. The predicted VOC rejections at the permeate flux of 20 L m-2 h-1 were almost identical to their experimentally obtained rejections. However, VOC rejection prediction at a lower permeate flux was less accurate. Further improvement and validation of the model with a variety of trace organic chemicals is required to allow for a more accurate prediction. The model was also validated using the membrane free-volume hole-radius value previously obtained from PALS analysis. Using PALS data resulted in some over-prediction. The results suggest that additional adjustment is necessary when using data from PALS analysis for predicting the rejection of small and uncharged solutes.

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http://hdl.handle.net/10453/134083