A Systematic Framework for Optimizing a Sweeping Gas Membrane Distillation (SGMD)

Safi, Nawras N; Ibrahim, Salah S.; Majdi, Hasan Shakir; Alsalhy, Qusay F.; Drioli, Enrico; Figoli, Alberto

doi:10.3390/membranes10100254

Cited by 20 publications

(20 citation statements)

References 27 publications

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“…It must be stressed that, in the published articles, the presented assessment of the influence of the process parameters on the SGMD course differs many times. Indeed, increasing the feed flow velocity most often significantly increased the permeate flux [10,15,17,20]; however, in other studies, a slight influence of this parameter was shown [14,18]. The gas temperature at the inlet to the module usually has little effect on the process performance [4,15,21], although its importance was shown in [4].…”

Section: Introductionmentioning

confidence: 94%

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The Application of Open Capillary Modules for Sweeping Gas Membrane Distillation

Gryta

2022

Energies

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The paper presents the sweeping gas membrane distillation realised by using the capillary module (length 1.1 m and area 0.1 m2) without housing (module shell). During the tests, the feed was flowing inside the hydrophobic polypropylene membranes. The studies were performed for two variants of process: with pre-heating (313–330 K) and without heating of the feed (brines). Under low gas flow (0.005 m/s) the evaporation performance varied in the range of 0.15–0.25 L/m2h, depending on the relative humidity (42–63%) and the air temperature (293–300 K). The application of feed pre-heating to 330 K led to an increase in the evaporation performance to 2.4 L/m2h. The permeate flux increased by 60% when the air flow velocities between the capillaries increased to 1.8–2.5 m/s. Increasing the feed flow rate from 0.1 to 0.59 m/s led to increase the permeate flux about 20% for feed temperature 293–310 K, and over 55% for feed temperature higher than 323 K.

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Section: Introductionmentioning

confidence: 94%

“…The use of small SGMD modules for testing allows for very favourable yields, often above 20 L/m 2 h [15,16,18,20]. Unfortunately, similarly to large DCMD modules, increasing the process scale causes a multiple decrease in the permeate flux [4][5][6]13,23].…”

Section: Introductionmentioning

confidence: 99%

The Application of Open Capillary Modules for Sweeping Gas Membrane Distillation

Gryta

2022

Energies

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“…Based on Equation (16), assuming the feed heat losses in all four configurations are the same, it can be found that VMD should have the highest thermal energy efficiency, which is close to 100% since there is negligible thermal conduction loss. The permeate sides of both AGMD and SGMD are gas phase, but SGMD would have higher flux [ 78 ] and have comparable or lower thermal efficiency to AGMD [ 79 ]. The permeate side of DCMD is the liquid phase.…”

Section: Mechanism Of Heat Transfer and Mass Transfer Through Poromentioning

confidence: 99%

Review of Transport Phenomena and Popular Modelling Approaches in Membrane Distillation

Dong

Dai

Zhao³

et al. 2021

Membranes

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In this paper, the transport phenomena in four common membrane distillation (MD) configurations and three popular modelling approaches are introduced. The mechanism of heat transfer on the feed side of all configurations are the same but are distinctive from each other from the membrane interface to the bulk permeate in each configuration. Based on the features of MD configurations, the mechanisms of mass and heat transfers for four configurations are reviewed together from the bulk feed to the membrane interface on the permeate but reviewed separately from the interface to the bulk permeate. Since the temperature polarisation coefficient cannot be used to quantify the driving force polarisation in Sweeping Gas MD and Vacuum MD, the rate of driving force polarisation is proposed in this paper. The three popular modelling approaches introduced are modelling by conventional methods, computational fluid dynamics (CFD) and response surface methodology (RSM), which are based on classic transport mechanism, computer science and mathematical statistics, respectively. The default assumptions, area for applications, advantages and disadvantages of those modelling approaches are summarised. Assessment and comparison were also conducted based on the review. Since there are only a couple of full-scale plants operating worldwide, the modelling of operational cost of MD was only briefly reviewed. Gaps and future studies were also proposed based on the current research trends, such as the emergence of new membranes, which possess the characteristics of selectivity, anti-wetting, multilayer and incorporation of inorganic particles.

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“…The Taguchi method was employed in the study of a systematic framework to test and optimize the performance of a sweep gas membrane distillation (SGMD) configuration in combination with a porous polyvinylidene fluoride-co-hexafluoropropylene (PVDF-co-HFP) membrane as reported by Nawras et al [32]. Another study used response surface methodology (RSM) to find the optimal conditions for the removal of brilliant green dye using a combination of photocatalysis and ceramic nanofiltration processes, researching the effect of pH, catalyst loading, and time duration variables on the response [33].…”

Section: Introductionmentioning

confidence: 99%

Optimization of MCM-41 Mesoporous Material Mixed Matrix Polyethersulfone Membrane for Dye Removal

et al. 2021

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The aim of this work is the optimization of the operating conditions under which MCM-41-mesoporous material can be incorporated into polyethersulfone (PES)/MCM-41 membranes for nanofiltration (NF) applications. MCM-41 mesoporous material mixed matrix PES membranes have the potential to reduce membrane fouling by organic dye molecules. Process optimization and modeling aim to reduce wasted energy while maintaining high flow during the operation to handle the energy efficiency problems membranes often have. An optimization technique was applied to obtain optimum values for some key parameters in the process to produce a certain amount of flux above the desired values. Response surface methodology (RSM) and analysis of variance (ANOVA) were used as mathematical and statistical analyses to improve the performance of the process on a larger scale. This work investigated the influence of the operating parameters, such as the feed pH values (3–11), MCM-41 content (0–1 wt.%), and the feed dye concentration (10–100 ppm) for each of the two studied dyes, acid black 210 (AB-210) and rose bengal (RB), and their interactions on the PES membrane permeability. The results showed that the PES membrane had the best performance at 64.25 (L·m−2·h−1·bar-1) and 63.16 (L·m−2·h−1·bar-1) for the AB-210 and RB dyes, respectively. An MCM-41 content of nearly 0.8 wt.% in the casting solution, feed dye concentration of 10 ppm for the studied dyes, and feed pH of 3 for the RB dye was found to be the optimal parameters for eliciting the response. The pH had no significant influence on the response for the AB-210 dye, while the pH shows some minor effects on response with the RB dye, and the Pareto chart of the standardized effects on the permeation flux of both dyes using statistically significant at the 5% significance level support these results.

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A Systematic Framework for Optimizing a Sweeping Gas Membrane Distillation (SGMD)

Cited by 20 publications

References 27 publications

The Application of Open Capillary Modules for Sweeping Gas Membrane Distillation

The Application of Open Capillary Modules for Sweeping Gas Membrane Distillation

Review of Transport Phenomena and Popular Modelling Approaches in Membrane Distillation

Optimization of MCM-41 Mesoporous Material Mixed Matrix Polyethersulfone Membrane for Dye Removal

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