Downstream variations of air-gap membrane distillation and comparative study with direct contact membrane distillation: A modelling approach

Ansari, Abolfazl; Galogahi, Fariba Malekpour; Thiel, David V.; Helfer, Fernanda; Millar, Graeme J.; Soukane, Sofiane; Ghaffour, Noreddine

doi:10.1016/j.desal.2021.115539

Cited by 24 publications

(4 citation statements)

References 50 publications

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“…Thus, achieving an optimal MD performance for desalination requires a fine balance between permeability and selectivity. While high porosity and pore diameter may improve flux, they may compromise selectivity. , …”

Section: Resultsmentioning

confidence: 99%

“…While high porosity and pore diameter may improve flux, they may compromise selectivity. 65,66 The water vapor flux for 1 wt % Cu + CNF/PVDF mixed membranes was observed to be significantly superior compared to 1 wt % CNF/PVDF and PVDF membranes, despite a marginal decrease over time. All the membranes exhibited a salt rejection rate of approximately 99.98%, although a reduction in this rate was noted for PVDF membranes, and a minor decline was observed for 1 wt % CNF membranes over a period of 36 h. Given the largely uncharted stability of nanomaterial-incorporated mixed membranes over prolonged durations, primarily due to the time-consuming and laborintensive nature of MD experiments, 54−57 a time-series forecasting model was trained based on the experimental data gathered from 36 h runs.…”

Section: Pore Morphology Porosity and Wetting Characteristics Of Pvdf...mentioning

confidence: 95%

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Investigating Permselectivity in PVDF Mixed Matrix Membranes Using Experimental Optimization, Machine Learning Segmentation, and Statistical Forecasting

Merugu,

Kearney,

Keum

et al. 2024

ACS Omega

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Section: Resultsmentioning

confidence: 99%

Section: Pore Morphology Porosity and Wetting Characteristics Of Pvdf...mentioning

confidence: 95%

Investigating Permselectivity in PVDF Mixed Matrix Membranes Using Experimental Optimization, Machine Learning Segmentation, and Statistical Forecasting

Merugu,

Kearney,

Keum

et al. 2024

ACS Omega

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“…The focus of AGMD investigations, in general, has mainly been directed towards improving process efficiency through optimization of operating parameters (theoretically and experimentally) [ 24 ], design improvement, or exploration of alternative heat sources [ 25 ] to make the technology more affordable [ 26 ]. Little attention has been paid to studying MD performance at high recoveries, especially for natural seawater and landfill leachate.…”

Section: Introductionmentioning

confidence: 99%

Fouling and Performance Investigation of Membrane Distillation at Elevated Recoveries for Seawater Desalination and Wastewater Reclamation

et al. 2022

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: This study reports on the impact of elevated recovery (i.e., 80%, 85%, and 90%) on the fouling and performance of air gap membrane distillation (AGMD) with real seawater and landfill leachate wastewater samples using polytetrafluoroethylene (PTFE) polymer membranes. Increasing the feed temperature from 55 °C to 65 °C improved the water flux of seawater and wastewater and shortened the operating time by 42.8% for all recoveries. The average water flux in the 80%, 85%, and 90% recovery experiments at the 65 °C feed temperature was 32%, 37.32%, and 36.7% higher than the case of 55 °C for the same recoveries. The water flux decline was more severe at a higher temperature and recovery. The highest flux decline was observed with a 90% recovery at 65 °C feed temperature, followed by an 85% recovery at 65 °C. Close examination of the foulants layer revealed that seawater formed a cake fouling layer made predominantly of metal oxides. In contrast, the landfill leachate fouling was a combination of pore blocking and cake formation, consisting mainly of carbonous and nitrogenous compounds. Physical cleaning with deionized (DI) water at 55 °C and 65 °C and chemical cleaning with hydrogen peroxide (H2O2) were investigated for their efficiency in removing membrane foulants. Analytical results revealed that seawater fouling caused membrane pore blockage while wastewater fouling formed a porous layer on the membrane surface. The results showed that membrane cleaning with hydrogen peroxide restored >97% of the water flux. Interestingly, the fouling factor in seawater tests was 10%, while it was 16% for the wastewater tests.

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“…; however, there are certain problems in the practical application of each process [12]. Membrane separation technology has become a research hotspot [13], as it is an effective way to treat micro-polluted water because of its positive water purification effect and its complete removal of organic matter [14]. Nanofiltration membrane technology has become the preferred membrane separation technology for the treatment of micro-polluted water due to its strong selective-separation ability [15]; the removal of disinfection by-products (trace weeding and pesticides, heavy metals, partial hardness), low operating pressure, partial removal of solute ions, excellent resulting water quality, and low energy consumption [16].…”

Section: Introductionmentioning

confidence: 99%

Study on Spacing Regulation and Separation Performance of Nanofiltration Membranes of GO

et al. 2022

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Graphene oxide (GO) membranes have attracted significant attention in the field of water processing in recent years due to their unique characteristics. However, few reports focus on both membrane stability and the “trade-off” effect. In this study, a series of aliphatic diamines (1, 2-ethylenediamine, 1, 4-butanediamine, and 1, 6-hexamethylenediamine) of covalent crosslinked GO were used to prepare diamine-modified nanofiltration membranes, BPPO/AX-GO, with adjustable layer spacing using the vacuum extraction–filtration method. Moreover, Ax-GO-modified nanofiltration membranes modified with adipose diamine had higher layer spacing, lower mass-transfer resistance, and better stability. When the number of carbon atoms was 5, the best layer spacing was reached, and when the number of carbon atoms was greater than 4, the modified membrane nanosheets more easily accumulated. With the increase in layer spacing, the water flux of the composite film increased to 26.27 L/m2·h·bar. Meanwhile, adipose diamine crosslinking significantly improved the stability of GO films. The interception sequence of different valence salts in the composite membrane was NaCl > Na2SO4 > MgSO4, and the rejection rate of bivalent salts was higher than that of monovalent salts. The results can provide some experimental basis and research ideas for overcoming the “trade-off” effect of a lamellar GO membrane.

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Downstream variations of air-gap membrane distillation and comparative study with direct contact membrane distillation: A modelling approach

Cited by 24 publications

References 50 publications

Investigating Permselectivity in PVDF Mixed Matrix Membranes Using Experimental Optimization, Machine Learning Segmentation, and Statistical Forecasting

Investigating Permselectivity in PVDF Mixed Matrix Membranes Using Experimental Optimization, Machine Learning Segmentation, and Statistical Forecasting

Fouling and Performance Investigation of Membrane Distillation at Elevated Recoveries for Seawater Desalination and Wastewater Reclamation

Study on Spacing Regulation and Separation Performance of Nanofiltration Membranes of GO

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