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Effects of scaling and cleaning on the performance of forward osmosis hollow fiber membranes

Forward osmosis (FO) process as an alternative to conventional desalination techniques has attracted much attention in recent years. Since mineral salt scaling is one of the major limitations for seawater desalination, the current study focused on the behaviors of thin film composite (TFC) FO hollow...

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Published in:Journal of membrane science 2012-10, Vol.415-416, p.101-108
Main Authors: Arkhangelsky, Elizabeth, Wicaksana, Filicia, Chou, Shuren, Al-Rabiah, Abdulrahman A., Al-Zahrani, Saeed M., Wang, Rong
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cited_by cdi_FETCH-LOGICAL-c430t-9fc68464d1addae6cbd2840924f73ec1e6df52b2d10068770eec91ace4e0589f3
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container_title Journal of membrane science
container_volume 415-416
creator Arkhangelsky, Elizabeth
Wicaksana, Filicia
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description Forward osmosis (FO) process as an alternative to conventional desalination techniques has attracted much attention in recent years. Since mineral salt scaling is one of the major limitations for seawater desalination, the current study focused on the behaviors of thin film composite (TFC) FO hollow fibers, which were fabricated in our laboratory, under the circumstance of calcium sulfate (CaSO4) scaling with sodium chloride as draw solution. The performance of FO hollow fiber membranes was compared with commercially available FO flat sheet membranes. Several cleaning strategies were also explored. Depending on the membrane orientation, experimental results suggested that the scaling of the FO hollow fibers was dominated by cake layer formation along with pore blocking in the orientation of active layer facing draw solution (AL-DS). The pore blocking could be a result of the penetration of crystals from the feed solution into the support matrix of the membrane, or the formation of crystals inside the porous support layer. At the same driving force, the water flux of the FO hollow fibers in the orientation of active layer facing feed solution (AL-FS) was twice higher than the water flux of the flat sheet membrane in both orientations. The water flux of scaled FO hollow fibers and flat sheet membranes in the AL-DS orientation could be successfully restored by hydraulic backwash procedure. To the best of our knowledge, this is the first study to examine the inorganic scaling of FO membranes in the AL-DS orientation. ▸ Effects of CaSO4 scaling on FO hollow fiber performance were investigated. ▸ Several cleaning strategies are also explored. ▸ Scaling was dominated by cake layer formation and pore blocking in AL-DS orientation. ▸ Water flux of scaled hollow fibers can be restored to 75% by hydraulic backwash.
doi_str_mv 10.1016/j.memsci.2012.04.041
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subjects artificial membranes
calcium sulfate
Chemistry
Cleaning
Colloidal state and disperse state
crystals
desalination
Exact sciences and technology
Flux decline
FO hollow fiber membranes
Forward osmosis
General and physical chemistry
Membrane orientation
Membranes
osmosis
Porous materials
Scaling
seawater
sodium chloride
title Effects of scaling and cleaning on the performance of forward osmosis hollow fiber membranes
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