Metallic spacers to enhance membrane distillation

Tan, Yong Zen; Ang, Edison Huixiang; Chew, Jia Wei

doi:10.1016/j.memsci.2018.10.073

Cited by 39 publications

(9 citation statements)

References 44 publications

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“…The idea of using spacers (usually employed in membrane modules to promote turbulence in feed channels) to induce photothermal conversion in proximity of the membrane surface, deserves a particular mention. 253 Adoption of metal spacers made of Ni and coated with photocatalytic Pt led to a reduction of up to 28% in energy per unit volume of distillate under light irradiation with respect to DCMD carried out with conventional polymeric spacers. 253…”

Section: Photothermally-assisted Evaporation and Photothermal Membran...mentioning

confidence: 99%

“…253 Adoption of metal spacers made of Ni and coated with photocatalytic Pt led to a reduction of up to 28% in energy per unit volume of distillate under light irradiation with respect to DCMD carried out with conventional polymeric spacers. 253…”

Section: Photothermally-assisted Evaporation and Photothermal Membran...mentioning

confidence: 99%

“…248 The idea of using spacers (usually employed in membrane modules to promote turbulence in feed channels) to induce photothermal conversion in proximity of the membrane surface, deserves a particular mention. 253 Adoption of metal spacers made of Ni and coated with photocatalytic Pt led to a reduction of up to 28% in energy per unit volume of distillate under light irradiation with respect to DCMD carried out with conventional polymeric spacers. 253 In addition to heat loss by convection, the amount of energy leaving the system by thermal radiation can represent a significant parasitic loss: considering the dependence on T 4 in eqn (23c), the radiative heat loss is 680 W m À2 (one-sun illumination) assuming a black solar absorber (e = 1) at 100 1C and an air temperature of 20 1C.…”

Section: Photothermal Membrane Distillation (Pmd)mentioning

confidence: 99%

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The advent of thermoplasmonic membrane distillation

et al. 2022

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Section: Photothermally-assisted Evaporation and Photothermal Membran...mentioning

confidence: 99%

Section: Photothermally-assisted Evaporation and Photothermal Membran...mentioning

confidence: 99%

Section: Photothermal Membrane Distillation (Pmd)mentioning

confidence: 99%

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The advent of thermoplasmonic membrane distillation

et al. 2022

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“…Similarly, Joule heating elements and spacers have been used to deliver localized heating to the feed channel [57,58]. [17] recently demonstrated the TP reduction by using the electrothermal property of carbon nanostructure.…”

Section: Second Law Efficiencymentioning

confidence: 99%

Desalination by Membrane Distillation

Mustakeem¹,

Soukane²,

Nawaz³

et al. 2022

Distillation Processes - From Solar and Membrane Distillation to Reactive Distillation Modelling, Simulation and Optimization

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At present, around 25% of water desalination processes are based on distillation. Similar to classical distillation, membrane distillation is a phased-change process in which a hydrophobic membrane separates two phases. Membrane distillation is considered an emerging player in the desalination, food processing and water treatment market. Due to its high salt rejection, less fouling propensity, operating at moderate temperature and pressure, membrane distillation is considered as a future sustainable desalination technology. The distillation process is quite well known in desalination. However, membrane distillation emerged a few decades ago, and a thorough understanding is needed to adapt this technique in the near future. This review chapter introduces the classical distillation and membrane distillation as an emerging technology in the desalination arena. Heat and mass transfer and thermodynamics in membrane distillation, characteristics of the performance metrics of membrane distillation are also described. Finally, the performance evaluation of MD is presented. The possibility of using low-grade heat in membrane distillation allows it to integrate directly to solar energy and industrial waste heat.

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“…Tijing et al first prepared electrospinning CFMs with PVDF-HFP and PAN to improve permeate flux [ 29 ] Hydrophilic and hydrophobic membranes are also used in MD to treat wastewater containing volatile organic compounds and surfactants [ 30 , 31 ]. CFMs with a modified structure (TiO 2 [ 32 , 33 ], SiO 2 [ 34 , 35 , 36 ], carbon nanotubes [ 37 , 38 ], and silver nanoparticle [ 39 , 40 ]) can achieve anti-fouling or anti-bacterial performance. The membranes with different pore sizes of PVDF-HFP skin layer and polyethylene terephthalate (PET) supporting layer can increase the membrane strength and enhance the MD performance [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

Transport Analysis of Anti-Wetting Composite Fibrous Membranes for Membrane Distillation

2020

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Composite electrospun fibrous membranes are widely studied for the application of membrane distillation. It is an effective approach to enhance the membrane distillation performance in terms of anti-wetting surface and permeate flux by fabricating composite fibrous membranes (CFMs) with a thin skin layer on a thick supporting layer. In this work, various membranes prepared with different pore sizes and porosities by polyacrylonitrile and polyvinylpyrrolidone were prepared. The membrane characteristics and membrane distillation performance were tested. The mass transfer across the membranes was analyzed experimentally and theoretically in detail. It is shown that the skin layer significantly increases liquid entry pressure of the CFM by 5 times. All the membranes have a similar permeate flux. The permeate flux of membranes is stable at 19.2 ± 1.2 kg/m2/h, and the salt rejection ratios remain above 99.98% at 78 ± 1 °C for 11 h. The pore size and porosity of membranes have an insignificant effect on the temperature distribution of membrane. The porosity and pore size of the skin layer have an insignificant effect on the mass transfer process of the CFM. The mass transfer process of the CFM is governed by the supporting layer.

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Metallic spacers to enhance membrane distillation

Cited by 39 publications

References 44 publications

The advent of thermoplasmonic membrane distillation

The advent of thermoplasmonic membrane distillation

Desalination by Membrane Distillation

Transport Analysis of Anti-Wetting Composite Fibrous Membranes for Membrane Distillation

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