Experimental mass transfer comparison between vacuum and direct contact membrane distillation for the concentration of carbonate solutions

Sparenberg, Marie-Charlotte; Hanot, Bastien; Molina-Fernández, Cristhian; Luis, Patricia

doi:10.1016/j.seppur.2021.119193

Cited by 22 publications

(4 citation statements)

References 45 publications

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“…Additionally, the vapor pressure in the saline solution is related to the water activity. As the salt concentration increases, the water activity decreases and the vapor pressure decreases [ 31 ], causing a decrease in the transmembrane flux of the membrane distillation process due to changes in the density, viscosity, and diffusion coefficient of the feed [ 32 ]. Furthermore, the crystallization on the membrane surface may be another reason for the decrease in performance because it reduces the effective membrane surface available for evaporation.…”

Section: Resultsmentioning

confidence: 99%

Finned Tubular Air Gap Membrane Distillation

Guo

2023

Membranes

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Finned tubular air gap membrane distillation is a new membrane distillation method, and its functional performance, characterization parameters, finned tube structures, and other studies have clear academic and practical application value. Therefore, the tubular air gap membrane distillation experiment modules composed of PTFE membrane and finned tubes were constructed in this work, and three representative air gap structures, including tapered finned tube, flat finned tube, and expanded finned tube, were designed. Membrane distillation experiments were carried out in the form of water cooling and air cooling, and the influences of air gap structures, temperature, concentration, and flow rate on the transmembrane flux were analyzed. The good water-treatment ability of the finned tubular air gap membrane distillation model and the applicability of air cooling for the finned tubular air gap membrane distillation structure were verified. The membrane distillation test results show that with the tapered finned tubular air gap structure, the finned tubular air gap membrane distillation has the best performance. The maximum transmembrane flux of the finned tubular air gap membrane distillation could reach 16.3 kg/m2/h. Strengthening the convection heat transfer between air and fin tube could increase the transmembrane flux and improve the efficiency coefficient. The efficiency coefficient (σ) could reach 0.19 under the condition of air cooling. Compared with the conventional air gap membrane distillation configuration, air cooling configuration for air gap membrane distillation is an effective way to simplify the system design and offers a potential way for the practical applications of membrane distillation on an industrial scale.

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Section: Resultsmentioning

confidence: 99%

Finned Tubular Air Gap Membrane Distillation

Guo

2023

Membranes

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“…However, since the flux depends on the applied driving force, the overall membrane mass transfer coefficient B m was calculated 69 to enable a more direct comparison between TBB-doped and undoped membranes. Indeed, B m allows evaluation of the real permeability performance of the membrane, apart from the effect of the driving force 71 . Fig.…”

Section: Resultsmentioning

confidence: 99%

Smart dynamic hybrid membranes with self-cleaning capability

Pantuso,

Ahmed,

Fontananova

et al. 2023

Nat Commun

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The growing freshwater scarcity has caused increased use of membrane desalination of seawater as a relatively sustainable technology that promises to provide long-term solution for the increasingly water-stressed world. However, the currently used membranes for desalination on an industrial scale are inevitably prone to fouling that results in decreased flux and necessity for periodic chemical cleaning, and incur unacceptably high energy cost while also leaving an environmental footprint with unforeseeable long-term consequences. This extant problem requires an immediate shift to smart separation approaches with self-cleaning capability for enhanced efficiency and prolonged operational lifetime. Here, we describe a conceptually innovative approach to the design of smart membranes where a dynamic functionality is added to the surface layer of otherwise static membranes by incorporating stimuli-responsive organic crystals. We demonstrate a gating effect in the resulting smart dynamic membranes, whereby mechanical instability caused by rapid mechanical response of the crystals to heating slightly above room temperature activates the membrane and effectively removes the foulants, thereby increasing the mass transfer and extending its operational lifetime. The approach proposed here sets a platform for the development of a variety of energy-efficient hybrid membranes for water desalination and other separation processes that are devoid of fouling issues and circumvents the necessity of chemical cleaning operations.

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