Modeling and application of direct contact membrane distillation for fluoride removal from aqueous solutions

Damtie, MM; Choi, JS

Modeling and application of direct contact membrane distillation for fluoride removal from aqueous solutions

Damtie, MM

Choi, JS

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Publication Type:: Journal Article
Citation:: Desalination and Water Treatment, 2017, 97 pp. 23 - 40
Issue Date:: 2017-11-01

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Field	Value	Language
dc.contributor.author	Damtie, MM https://orcid.org/0000-0003-4985-6574	en_US
dc.contributor.author	Choi, JS	en_US
dc.date.issued	2017-11-01	en_US
dc.identifier.citation	Desalination and Water Treatment, 2017, 97 pp. 23 - 40	en_US
dc.identifier.issn	1944-3994	en_US
dc.identifier.uri	http://hdl.handle.net/10453/126260
dc.description.abstract	© 2017 Desalination Publications. All rights reserved. The practicability of direct contact membrane distillation (DCMD) process for the removal of fluoride was investigated under different feed water, operational and membrane characteristics. Commercially available hydrophobic 0.22 mm porous polytetrafluoroethylene (PTFE) and polyvinylidenefluoride (PVDF) membrane applied on fluoridated ultrapure water exhibit over 99% rejection of fluoride, yielding fluxes of up to 39.3 and 26.4 kg/m2 h at 60°C, respectively. The dusty gas mathematical model and energy balance equations were employed to study the mass and heat transfer mechanisms. In addition to the good agreement between the theoretical and experimental comparison, the overall mass transfer analysis revealed that Knudsen–molecular–Poiseuille transition diffusion and Knudsen–Poiseuille diffusion are the dominant mass transfer mechanisms across the 0.22 mm flat sheet PVDF and PTFE membranes, respectively. The effects of different parameters, such as temperature, initial fluoride concentration, feed flow rate, and membrane properties, on the flux and removal efficiencies were also evaluated, and feed temperature was found to be the most important operating parameter since higher temperatures induce the lowest temperature polarization coefficient (TPC) and a higher thermal efficiency (TE). Moreover, a wetting rate analysis in actual industrial wastewater sample indicated that a solution with higher organic matter, an membrane distillation (MD) system with PTFE membrane, and a sample with bigger initial fluoride concentration induce bigger wetting rate. Therefore, the DCMD process can be applied on fluoride affected water sources toward producing high-quality water suitable for a potable water supply. Exploiting renewable source potentials or industrial waste (free) energy will bring better economic advantage on the application.	en_US
dc.relation.ispartof	Desalination and Water Treatment	en_US
dc.relation.isbasedon	10.5004/dwt.2017.21690	en_US
dc.title	Modeling and application of direct contact membrane distillation for fluoride removal from aqueous solutions	en_US
dc.type	Journal Article
utslib.citation.volume	97	en_US
utslib.for	0904 Chemical Engineering	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
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	97	en_US

Abstract:

© 2017 Desalination Publications. All rights reserved. The practicability of direct contact membrane distillation (DCMD) process for the removal of fluoride was investigated under different feed water, operational and membrane characteristics. Commercially available hydrophobic 0.22 mm porous polytetrafluoroethylene (PTFE) and polyvinylidenefluoride (PVDF) membrane applied on fluoridated ultrapure water exhibit over 99% rejection of fluoride, yielding fluxes of up to 39.3 and 26.4 kg/m2 h at 60°C, respectively. The dusty gas mathematical model and energy balance equations were employed to study the mass and heat transfer mechanisms. In addition to the good agreement between the theoretical and experimental comparison, the overall mass transfer analysis revealed that Knudsen–molecular–Poiseuille transition diffusion and Knudsen–Poiseuille diffusion are the dominant mass transfer mechanisms across the 0.22 mm flat sheet PVDF and PTFE membranes, respectively. The effects of different parameters, such as temperature, initial fluoride concentration, feed flow rate, and membrane properties, on the flux and removal efficiencies were also evaluated, and feed temperature was found to be the most important operating parameter since higher temperatures induce the lowest temperature polarization coefficient (TPC) and a higher thermal efficiency (TE). Moreover, a wetting rate analysis in actual industrial wastewater sample indicated that a solution with higher organic matter, an membrane distillation (MD) system with PTFE membrane, and a sample with bigger initial fluoride concentration induce bigger wetting rate. Therefore, the DCMD process can be applied on fluoride affected water sources toward producing high-quality water suitable for a potable water supply. Exploiting renewable source potentials or industrial waste (free) energy will bring better economic advantage on the application.

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http://hdl.handle.net/10453/126260