Correlation between the feed composition and membrane wetting in a direct contact membrane distillation process

Lim, Ji Eun; Son, Kwang Pyo; Kang, Seung Mo; Park, Jeongwon; Lee, Tae-Min; Cho, Hyeongrak; Kim, Seung Hyun; Lee, Sang-Ho; Chae, So-Ryong; Park, Pyung Kyu

doi:10.1039/d0ew01125h

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…sults showed that although unsteady vortex structures are able to mix ization layers with the bulk, they are unable to mix the concentration spacers often increase the permeate flux at the expense of greater mine Lim et al [15] used a lab-scale DCMD system to investigate the e concentration of organic and inorganic contents in feed bulk on wettin Their results show that a salt concentration rise in the added solution i brane wetting. Moreover, salts could pass through wetted pores and fo on the distillate side of the membrane.…”

Section: Modeling and Configuration Descriptionmentioning

confidence: 99%

“…Lim et al [ 15 ] used a lab-scale DCMD system to investigate the effect of varying the concentration of organic and inorganic contents in feed bulk on wetting membrane pores. Their results show that a salt concentration rise in the added solution increased the membrane wetting.…”

Section: Introductionmentioning

confidence: 99%

“…Membranes 2023, 13, 588 2 of 15 Swaminathan et al [3] developed a simplified numerical model for membrane distillation energy-efficiency modules based on the heat exchanger analogy. It was found that, over a wide range of operating conditions, the results of the simplified heat exchanger model were within 11% of the results from more detailed simulations.…”

Section: Introductionmentioning

confidence: 99%

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Using the Log Mean Temperature Difference (LMTD) and ε-NTU Methods to Analyze Heat and Mass Transfer in Direct Contact Membrane Distillation

Almeshaal

Choubani

2023

Membranes

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In direct contact membrane distillation (DCMD), heat and mass transfers occur through the porous membrane. Any model developed for the DCMD process should therefore be able to describe the mass transport mechanism through the membrane, the temperature and concentration effects on the surface of the membrane, the permeate flux, and the selectivity of the membrane. In the present study, we developed a predictive mathematical model based on a counter flow heat exchanger analogy for the DCMD process. Two methods were used to analyze the water permeate flux across one hydrophobic membrane layer, namely the log mean temperature difference (LMTD) and the effectiveness-NTU methods. The set of equations was derived in a manner analogous to that employed for heat exchanger systems. The obtained results showed that the permeate flux increases by a factor of approximately 220% when increasing the log mean temperature difference by a factor of 80% or increasing the number of transfer units by a factor of 3%. A good level of agreement between this theoretical model and the experimental data at various feed temperatures confirmed that the model accurately predicts the permeate flux values for the DCMD process.

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Section: Modeling and Configuration Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Using the Log Mean Temperature Difference (LMTD) and ε-NTU Methods to Analyze Heat and Mass Transfer in Direct Contact Membrane Distillation

Almeshaal

Choubani

2023

Membranes

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“…The precipitated minerals block the membrane pores and reduce the membrane’s water vapor permeability. Scaling by gypsum, silica, calcite, sodium chloride, and mixed salt feed solutions has been investigated. − Among different types of scalants, gypsum is one of the most challenging and widely studied scalants due to its practical relevance and its low and pH-insensitive solubility, that is, scaling by gypsum cannot be mitigated by merely adjusting the pH of the feed solution as in the case of mitigating calcite scaling. ,, …”

Section: Introductionmentioning

confidence: 99%

Negative Pressure Membrane Distillation for Excellent Gypsum Scaling Resistance and Flux Enhancement

Liu

Horseman

Wang

et al. 2021

Environ. Sci. Technol.

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Membrane distillation (MD) has potential to become a competitive technology for managing hypersaline brine but not until the critical challenge of mineral scaling is addressed. The state-of-the-art approach for mitigating mineral scaling in MD involves the use of superhydrophobic membranes that are difficult to fabricate and are commercially unavailable. This study explores a novel operational strategy, namely, negative pressure direct contact membrane distillation (NP-DCMD) that can minimize mineral scaling with commercially available hydrophobic membranes and at the same time enhance the water vapor flux substantially. By applying a negative gauge pressure on the feed stream, NP-DCMD achieved prolonged resistance to CaSO4 scaling and a dramatic vapor flux enhancement up to 62%. The exceptional scaling resistance is attributable to the formation of a concave liquid–gas under a negative pressure that changes the position of the water–air interface to hinder interfacial nucleation and crystal growth. The substantial flux enhancement is caused by the reduced molecular diffusion resistance within the pores and the enhanced heat transfer kinetics across the boundary layer in NP-DCMD. Achieving substantial performance improvement in both the scaling resistance and vapor flux with commercial membranes, NP-DCMD is a significant innovation with vast potential for practical adoption due to its simplicity and effectiveness.

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Novel chlorine resistant thin-film composite forward osmosis membrane: Preparation and performance evaluation in the regeneration of MEG aqueous solution

Samieirad

Mousavi

Saljoughi

2022

Chemical Engineering Research and Design

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Correlation between the feed composition and membrane wetting in a direct contact membrane distillation process

Abstract: Membrane distillation is a promising option for desalination owing to its advantages, but additional studies are still required before drawbacks such as membrane wetting can be resolved. To investigate the...

Cited by 7 publications

References 35 publications

Using the Log Mean Temperature Difference (LMTD) and ε-NTU Methods to Analyze Heat and Mass Transfer in Direct Contact Membrane Distillation

Using the Log Mean Temperature Difference (LMTD) and ε-NTU Methods to Analyze Heat and Mass Transfer in Direct Contact Membrane Distillation

Negative Pressure Membrane Distillation for Excellent Gypsum Scaling Resistance and Flux Enhancement

Novel chlorine resistant thin-film composite forward osmosis membrane: Preparation and performance evaluation in the regeneration of MEG aqueous solution

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