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Effect of feed temperature and membrane orientation on pre-treatment sludge volume reduction through forward osmosis

Liyanaarachchi, S., Jegatheesan, V., Obagbemi, I., Muthukumaran, S. and Shu, L. 2015, Effect of feed temperature and membrane orientation on pre-treatment sludge volume reduction through forward osmosis, Desalination and water treatment, vol. 54, no. 4-5, pp. 838-844, doi: 10.1080/19443994.2014.907754.

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Title Effect of feed temperature and membrane orientation on pre-treatment sludge volume reduction through forward osmosis
Author(s) Liyanaarachchi, S.
Jegatheesan, V.
Obagbemi, I.
Muthukumaran, S.
Shu, L.
Journal name Desalination and water treatment
Volume number 54
Issue number 4-5
Start page 838
End page 844
Total pages 8
Publisher Taylor & Francis
Place of publication London, Eng.
Publication date 2015
ISSN 1944-3994
1944-3986
Keyword(s) Forward osmosis
Reverse osmosis
Sludge pre-treatment
Water recovery
Summary This study focuses on volume reduction of pre-treatment sludge as well as on dilution of reverse osmosis (RO) concentrate through emerging forward osmosis (FO) technology where RO concentrate draws water from the pre-treatment sludge (feed solution) in order to reduce pre-treatment sludge volume and increase the RO water recovery. Experiments were carried out using two different types of sludge i.e. (1) synthetic pre-treatment sludge (Lab sludge) which has lower salinity and (2) actual sludge from Perth Seawater Desalination Plant, Australia (Perth Seawater Desalination Plant (PSDP) sludge) which has higher salinity. Effect of membrane orientation (FO and pressure-retarded osmosis (PRO) modes) and temperature of pre-treatment sludge on permeate water flux was investigated. There was a significant increase in water flux from 3.2 to 10.2 LMH (i.e. ~3 times higher) when temperature increased from 20 to 40°C for Lab sludge in PRO mode. However, there is no significant effect of temperature on water flux in FO mode for Lab sludge. On the contrary for PSPD sludge, there was no effect on water flux with increase in temperature at PRO mode. Dissolved ions in the porous side increased the severity of concentrative internal concentration polarization; hence, it could reduce the flux. There was no significant change in water flux when temperature increased from 20 to 40°C for PSDP sludge in FO mode. However, higher amount of water has permeated from Lab sludge compared to PSDP sludge in FO mode. © 2014 © 2014 Balaban Desalination Publications. All rights reserved.
Language eng
DOI 10.1080/19443994.2014.907754
Field of Research 090404 Membrane and Separation Technologies
Socio Economic Objective 829803 Management of Liquid Waste from Plant Production (excl. Water)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Taylor & Francis
Persistent URL http://hdl.handle.net/10536/DRO/DU:30069515

Document type: Journal Article
Collection: School of Engineering
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