Modeling and Simulation of a Vacuum Membrane Distillation Plant Coupled With Solar Energy and Using Helical Hollow Fibers

Zrelli, Adel; Chaouachi, Béchir

doi:10.1590/0104-6632.20190363s20180531

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…Many configurations of membranes can be seen such as hollow fiber membranes or flat membranes [28]. In this study, we prepared flat membranes from a waste of low density polyethylene (LDPE) as described elsewhere [29].…”

Section: Membrane Preparationmentioning

confidence: 99%

Valorization of Date Palm Wastes by Lignin Extraction to be Used for the Improvement of Polymeric Membrane Characteristics

Zrelli

Elfalleh

Ghorbal

et al. 2021

Period. Polytech. Chem. Eng.

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This work aimed to valorize Date Palm Wastes (DPW) by the extraction of lignin and its application for polymeric membrane modification. Lignin was extracted from five types of DPW (date palm kernel, leaflet, pedicel, palm frond, and fibrilium) using the Klason method. Following DPW characterization, we remark the highest amount of extractives content in the leaflet sample (10.07 %) and the lowest in the fibrilium sample (6.51 %). The ash content ranged from 1.56 % for fibrilium to 7.96 % for palm frond. After extraction, the lignin yield was in the range of 22–32 %. The extracted lignins were characterized by Infrared and Ultraviolet–visible spectroscopy. All extracted lignins provide a high concentration of (-OH) group. Besides, both syringyl and guaiacyl are present in the extracted lignins with a slightly more syringyl unit. The extracted lignins were added to the polymeric solution, prepared from waste plastic, to produce membranes. These membranes showed improved hydrophilicity marked a decrease in the contact angle of 28 % when the lignin concentration increased from 0.125 to 0.5 %. In addition, the membrane porosity increased with the use of the extracted lignins as an additive.

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Section: Membrane Preparationmentioning

confidence: 99%

Valorization of Date Palm Wastes by Lignin Extraction to be Used for the Improvement of Polymeric Membrane Characteristics

Zrelli

Elfalleh

Ghorbal

et al. 2021

Period. Polytech. Chem. Eng.

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“…It can be noticed that the publication rate follows two distinct regimes (slopes) during these two decades displaying a slow progression during the 2000-2009 period and followed by a sharp uptake in pace after 2010. More specifically, researchers have sought to leverage hydrodynamic phenomena' simulation and modeling studies to optimize membrane distillation operating parameters [1][2][3][4][5]. Furthermore, the choice of membrane materials and fabrication processes have been widely explored to increase the permeate flux and mitigate fouling phenomena [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Applications of Helical Versus Straight Hollow Fiber Membranes: A Review

Zrelli¹,

Debaya²,

Doucoure³

et al. 2022

ETJ

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A comprehensive comparison was performed between helical and straight hollow fibers.  Applications of helical hollow fibers membrane were studied.  The use of helical fibers minimizes fouling and concentration polarization.  Helical configuration promotes turbulence.The production of straight and helical hollow fibers plays an important role in developing hollow fiber membrane technology that encompasses a broad range of designs. During the last two decades, scientific studies devoted to straight hollow fibers were more abundant than those focused on helical fibers. Several major applications considering side-by-side testing of these two geometries are discussed in this review. For membrane extraction, desalination, and membrane contactor processes, it is observed that permeability rates are 10%-400 % higher for helical fibers compared to straight fibers. This outcome is justified by the presence of Dean-vortices-induced flow turbulences inherent to the geometry of helical membranes. These conditions give rise to an uptake of mass and heat transfer coefficients and a reduction of temperature and concentration polarization phenomena. Aside from enhanced flow properties, helical hollow fiber bundles tend to be more robust by design, thus exhibiting better resiliency over long service operations than straight bundles. One persistent shortcoming of the helical fibers seems to be an increase in pressure drop. However, this does not always translate into a higher energy consumptioni.e., versus straight bundles. Given the performance advantage, product robustness, and adaptiveness to a broad range of applications, the adoption of helical hollow fiber technology deserves growing support from the membrane community in academic and industrial settings.

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“…This process has the advantage of reducing energy expenditure while rejecting nonvolatile compounds and macromolecules (Li et al., 2018). One of the many advantages of adopting the MD process is the possibility to use the residual process heat (Liao et al., 2020) or even renewable sources of energy, like solar energy to raise the feed temperature (Zrelli & Chaouachi, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of non‐solvent on the synthesis of polyvinylidene fluoride membranes for vacuum membrane distillation desalination

Sachett

Duarte

Zeni

et al. 2021

Environmental Quality Mgmt

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The need for freshwater boosted the research for alternative technologies with a cleaner and more efficient approach. Membrane distillation (MD) stands out due to its efficiency in purifying aqueous solutions and easy operation. Thus, this work aims at developing and characterizing polyvinylidene fluoride membranes using the non-solvent phase inversion (NIPS) methodology for the MD process. Distilled water and ethanol (at different proportions) were tested as non-solvent and N'N'dimethylformamide as solvent. The morphology, crystallinity, and porosity of each sample were determined. The utilization of ethanol as non-solvent produced more hydrophobic membranes with higher liquid entry pressure. Scanning electron microscope analysis showed that different proportions of water and ethanol changes the morphology of the resulting membrane, with clear influence on the formation of macrovoids. The samples crystallinity was over 54% and the porosity, over 55%. The sample with best results in the vacuum MD process prpesented an average of over 98% of salt retention during a period of 6 h. This work shows the beneficial influence ethanol as non-solvents for the preparation of PVDF membranes for the process of hydrophobic vacuum MD.

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Modeling and Simulation of a Vacuum Membrane Distillation Plant Coupled With Solar Energy and Using Helical Hollow Fibers

Cited by 8 publications

References 25 publications

Valorization of Date Palm Wastes by Lignin Extraction to be Used for the Improvement of Polymeric Membrane Characteristics

Valorization of Date Palm Wastes by Lignin Extraction to be Used for the Improvement of Polymeric Membrane Characteristics

Applications of Helical Versus Straight Hollow Fiber Membranes: A Review

Effect of non‐solvent on the synthesis of polyvinylidene fluoride membranes for vacuum membrane distillation desalination

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