Performance evaluation of ePTFE and PVDF flat-sheet module direct contact membrane distillation

This paper reports experiments using a flat-sheet module with 0.18 approximately 0.45 microm ePTFE (expanded polytetrafluoroethylene) and PVDF (polyvinylidene fluoride) membranes to show the effects of membrane properties, salt concentration and fluid hydrodynamics on the permeate flux and salt reje...

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Bibliographic Details
Published in:Water science and technology 2010-01, Vol.62 (2), p.347-352
Main Authors: Chuang, Ching-Jung, Tung, Kuo-Lun, Fan, Yang-Hsiang, Ho, Chii-Dong, Huang, James
Format: Article
Language:English
Subjects:
Cooling
Desalination
Distillation
Distillation - instrumentation
Distillation - methods
Distilling
Energy
Energy consumption
Energy efficiency
Experiments
Fluctuations
Fluid dynamics
Fluid flow
Fluorides
Flux
Heat exchangers
Heat transfer
Hydrodynamics
Integration
Membranes
Membranes, Artificial
Performance evaluation
Permeability
Polytetrafluoroethylene
Polytetrafluoroethylene - chemistry
Polyvinylidene fluorides
Polyvinyls - chemistry
Pore size
Reynolds number
Rivers
Salt rejection
Temperature
Water Purification - instrumentation
Water Purification - methods
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Summary:This paper reports experiments using a flat-sheet module with 0.18 approximately 0.45 microm ePTFE (expanded polytetrafluoroethylene) and PVDF (polyvinylidene fluoride) membranes to show the effects of membrane properties, salt concentration and fluid hydrodynamics on the permeate flux and salt rejection of DCMD (direct contact membrane distillation). A theoretical prediction of the permeate flux was carried out, and was in close agreement with the experimental results. In addition, the energy integration of the process was also analyzed in order to evaluate module design to increase energy efficiency. According to the simulated results of the energy integration design, a combination of simultaneous cooling of the permeate stream and an additional heat exchanger to lower the temperature of the permeate stream not only enhances the MD flux, but also reduces energy consumption.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2010.740