Removal of volatile organic compounds from aqueous solutions applying thermally driven membrane processes. 2. Air gap membrane distillation

Kujawska, Anna; Kujawski, Jan; Bryjak, Marek; Cichosz, Marcin; Kujawski, Wojciech

doi:10.1016/j.memsci.2015.10.047

Cited by 43 publications

(24 citation statements)

References 50 publications

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“…Among these studies, various authors applied MD to the separation of model alcohol-water binary solutions. The efficiency of the major MD module configurations have been tested including DCMD [24], VMD [25][26][27], SGMD [28] and AGMD [29][30][31]. In most reported works, a parametric study showing the influence of operating parameters is provided.…”

Section: Figure 1: the 4 Major Configurations Of MD Modules (Adapted mentioning

confidence: 99%

“…In these studies, models have also been developed allowing to study heat and mass transfer, the role of concentration and thermal polarization and to predict MD performances [24,26,27]. Kujawska et al, (2016) [31] also compared AGMD to another thermally driven membrane process, namely thermopervaporation. Under the tested conditions, they concluded that AGMD was the more desirable technique to separate ethanol from water-ethanol binary mixtures (feed concentration in the range 0-4 wt %).…”

Section: Figure 1: the 4 Major Configurations Of MD Modules (Adapted mentioning

confidence: 99%

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Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth

Loulergue

Balannec

Graët

et al. 2019

Separation and Purification Technology

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et al.. Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth. Separation and Purification Technology, Elsevier, 2019, 213, pp. Abstract :More than 80 % of the energy consumed in the world comes from fossil fuels alone. However, fermentative production of bioethanol has recently gained a considerable interest as an alternative and renewable fuel. Among the different biomasses, the use of macro-algae hydrolysate as the fermentation substrate has been shown to be interesting. However, after fermentation, ethanol has to be separated from the complex broth containing numerous compounds such as microorganisms, fermentation co-products, non-fermentable organic matter, salts, etc. In this study, Air-Gap Membrane Distillation (AGMD) was evaluated to extract ethanol from these complex mixtures.Experiments were conducted using synthetic mixtures and real algal-based fermentation broths.AGMD was able to obtain an ethanol-enriched permeate while other compounds were retained by the membrane. Furthermore, by adjusting the operating parameters, it was possible to maximize the process productivity and selectivity at the same time. Finally, working with the real biofluids revealed that AGMD operation was robust toward membrane wetting, even in presence of membrane fouling.AGMD was thus demonstrated to be a suitable technique for bioethanol extraction from algal-based fermentation broths.

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Section: Figure 1: the 4 Major Configurations Of MD Modules (Adapted mentioning

confidence: 99%

Section: Figure 1: the 4 Major Configurations Of MD Modules (Adapted mentioning

confidence: 99%

Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth

Loulergue

Balannec

Graët

et al. 2019

Separation and Purification Technology

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“…MD is classified into different configurations: direct contact membrane distillation (DCMD), vacuum membrane distillation (VMD), air gap membrane distillation (AGMD) and sweep gas membrane distillation (SGMD). 1 Different applications in which the MD process is generally used include desalination, [2][3][4] water purification, 5 food processing, 6 concentration of aqueous solutions 7,8 and removal of VOCs 9,10 Air gap membrane distillation is a thermally driven membrane separation process that operates at relatively lower temperature and pressure. 11 In AGMD, an air gap is introduced between the permeate side membrane surface and condensing plate.…”

Section: Introductionmentioning

confidence: 99%

Experimental and mathematical study of air gap membrane distillation for aqueous HCl azeotropic separation

Kalla

Upadhyaya

Singh

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND In the present study, the feasibility of air gap membrane distillation (AGMD) process is investigated for breaking an azeotropic mixture. A test cell AGMD module with hydrophobic PTFE membrane was fabricated and HCl/H2O azeotrope (20.2 wt% HCl) was taken as feed. A mathematical model based on Stefan diffusion multicomponent molecular‐Knudsen mass transfer approach has been developed and validated with experimental data. The effects of different process parameters on total permeate flux, on selectivity and on breaking an HCl/H2O azeotrope mixture also have been studied. The feed side membrane surface temperature and membrane side condensing surface temperature were estimated by CFD modelling. RESULTS The HCl selectivity obtained in the permeate was <1, which indicates that permeate flux is leveraged with water and a higher HCl concentration in the retentate was achieved relative to the permeate. The permeate flux decreased from 36 to 17 kg m−2 h−1 upon increasing the air gap from 3 mm to 11 mm at 50 °C feed temperature. The permeate flux increased from 4 to 28.5 kg m−2 h−1 upon increasing the feed temperature from 30 to 50 °C at 5 mm air gap. CONCLUSION With azeotropic feed, the maximum concentration of HCl achieved in the retentate was 30.8 wt% HCl (i.e. a hyperazeotropic solution) and in permeate was found to be 15.29 wt% HCl (i.e. hypoazeotropic solution). This indicates a strong possibility of using AGMD for azeotropic mixture separation. It also was observed that the permeate flux is affected mainly by feed temperature and air gap width. © 2018 Society of Chemical Industry

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“…Chemically attached coupling agents with low-surface-energy can be also efficiently used to turn the hydrophilic character materials to hydrophobic one [38][39][40][41]. Within that group of compounds, perfluoroalkylsilane (PFAS) molecules [42][43][44][45], hydrophobic polymers [46], as well as Grignard compounds [47,48] have been found to generate hydrophobic surfaces. The aforementioned grafting agents were efficiently modified by the chemical attachment to the ceramic support.…”

Section: Introductionmentioning

confidence: 99%

“…For that particular reason, the modification of membrane surface is required to change the surface character from hydrophilic to hydrophobic one. Considering the high effectiveness of the grafting process of ceramic materials and good performance in membrane-based separation techniques (e.g., vacuum pervaporation [42,43,54,55], vacuum membrane distillation [56], air-gap and direct membrane distillation [42,45], and organic solvent nanofiltration [47,48,57]) it should be pointed out that such modification also possessed disadvantages. Namely, a significant drawback is the presence of fluorine atoms in coupling agents.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Ceramic Membranes for Water Desalination

et al. 2017

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Hydrophilic ceramic membranes (tubular and planar) made of TiO 2 and Al 2 O 3 were efficiently modified with non-fluorinated hydrophobic grafting molecules. As a result of condensation reaction between hydroxyl groups on the membrane and reactive groups of modifiers, the hydrophobic surfaces were obtained. Ceramic materials were chemically modified using three various non-fluorinated grafting agents. In the present work, the influence of grafting time and type of grafting molecule on the modification efficiency was evaluated. The changes of physicochemical properties of obtained hydrophobic surfaces were determined by measuring the contact angle (CA), roughness (RMS), and surface free energy (SFE). The modified surfaces were characterized by contact angle in the range of 111-132 • . Moreover, hydrophobic tubular membranes were utilized in air-gap membrane distillation to desalination of sodium chloride aqueous solutions. The observed permeate fluxes were in the range of 0.7-4.8 kg·m −2 ·h −1 for tests with pure water. The values of permeate fluxes for membranes in contact with NaCl solutions were smaller, within the range of 0.4-2.8 kg·m −2 ·h −1 . The retention of NaCl in AGMD process using hydrophobized ceramic membranes was close to unity for all investigated membranes.

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Removal of volatile organic compounds from aqueous solutions applying thermally driven membrane processes. 2. Air gap membrane distillation

Cited by 43 publications

References 50 publications

Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth

Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth

Experimental and mathematical study of air gap membrane distillation for aqueous HCl azeotropic separation

Hydrophobic Ceramic Membranes for Water Desalination

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