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Occurrence of salt breakthrough and air-vapor pocket in a direct-contact membrane distillation.pdf
Desalination 402 (2017) 42–49
Contents lists available at ScienceDirect
Desalination
journal homepage: /locate/desal
Occurrence of salt breakthrough and air-vapor pocket in a direct-contact membrane distillation
Yuelian Peng a,?, Ju Ge a, Shaobin Wang b,?, Zhehao Li c,?
a Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, PR China b Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia c Changchun Gold Research Institute, 130012, PR China
HIGHLIGHTS
? Salt breakthrough and vapor pocket in membrane distillation was investigated. ? Salt permeation will occur in hydrophobic polyvinylidene ?uoride membrane. ? Hydrophobic polytetra?uoroethylene membrane prevents wetting and salt permeation. ? An increase in packing density increases the membrane distillation ?ux.
article info
Article history: Received 23 April 2016 Received in revised form 26 September 2016 Accepted 28 September 2016 Available online 2 October 2016
Keywords: Hollow ?ber Direct-contact membrane distillation Salt breakthrough Air-vapor pocket Membrane wetting
abstract
A polyvinylidene ?uoride (PVDF) hollow ?ber module with a low packing density and the permeate ori?ces on one side was used in a direct-contact membrane distillation process (DCMD). Comparative tests were also performed using a highly hydrophobic polytetra?uoroethylene (PTFE) membrane and a low hydrophobic PVDF membrane with different packing densities. Under varying operating conditions such as the feed and permeate ?ow rates as well as temperature, the performances of the DCMD were comprehensively investigated. It was rarely found that salt breakthrough in an idle mode and air-vapor pocket in an operative mode could occur. Partial wetting was for the ?rst time found tending to happen in the PVDF membrane in idle mode, which led to salt breakthrough. High feed temperature and ?ow rate accelerate
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