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Membrane distillation trial on textile wastewater containing surfactants using hydrophobic and hydrophilic-coated Polytetrafluoroethylene (PTFE) membranes

Villalobos García, Jesus, Dow, Noel, Milne, Nicholas, Zhang, Jianhua, Naidoo, Leslie, Gray, Stephen and Duke, Mikel 2018, Membrane distillation trial on textile wastewater containing surfactants using hydrophobic and hydrophilic-coated Polytetrafluoroethylene (PTFE) membranes, Membranes, vol. 8, no. 2, doi: 10.3390/membranes8020031.

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Title Membrane distillation trial on textile wastewater containing surfactants using hydrophobic and hydrophilic-coated Polytetrafluoroethylene (PTFE) membranes
Author(s) Villalobos García, Jesus
Dow, Noel
Milne, Nicholas
Zhang, Jianhua
Naidoo, Leslie
Gray, Stephen
Duke, Mikel
Journal name Membranes
Volume number 8
Issue number 2
Total pages 15
Publisher MDPI
Place of publication Basel, Switzerland
Publication date 2018-06-15
ISSN 2077-0375
Keyword(s) desalination
hydrophilic membrane
membrane distillation
polytetrafluoroethylene
Summary Treating wastewater from textile plants using membrane distillation (MD) has great potential due to the high-salinity wastes and availability of waste heat. However, textile wastewaters also contain surfactants, which compromise the essential hydrophobic feature of the membrane, causing membrane wetting. To address this wetting issue, a custom-made membrane consisting of a hydrophilic layer coated on hydrophobic polytetrafluoroethylene (PTFE) was tested on textile wastewater in a pilot MD setup, and compared with a conventional hydrophobic PTFE membrane. The test was carried out with a feed temperature of 60 °C, and a permeate temperature of 45 °C. The overall salt rejection of both membranes was very high, at 99%. However, the hydrophobic membrane showed rising permeate electrical conductivity, which was attributed to wetting of the membrane. Meanwhile, the hydrophilic-coated membrane showed continually declining electrical conductivity demonstrating an intact membrane that resisted wetting from the surfactants. Despite this positive result, the coated membrane did not survive a simple sodium hydroxide clean, which would be typically applied to a membrane process. This brief study showed the viability of membrane distillation membranes on real textile wastewaters containing surfactants using hydrophilic-coated hydrophobic PTFE, but the cleaning process required for membranes needs optimization.
Language eng
DOI 10.3390/membranes8020031
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2018, by the author
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30110583

Document type: Journal Article
Collections: School of Engineering
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.