Optimizing the performance of sweeping gas membrane distillation for treating naturally heated saline groundwater

Lee, Taemin; Lee, Tae-Min; Naidu, Gayathri; Huang, Yuhan; Shon, Ho Kyong; Kim, Seung Hyun

doi:10.1016/j.desal.2022.115736

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…[32][33][34] Indeed, membrane distillation can be implemented in various congurations with different setups and designs. [35][36][37][38][39][40] One of the commonly used and costeffective congurations is direct contact membrane distillation (DCMD). [41][42][43][44] For successful application of a membrane in MD, the following requirements are imposed on it: membrane should be highly porous, thin and hydrophobic, allowing water vapor to be transferred from the initial solution (concentrate) to a clean side (permeate) with low thermal conductivity, while avoiding leakage of the salt solution.…”

Section: Introductionmentioning

confidence: 99%

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Effect of hydrophobized PET TeMs membrane pore-size on saline water treatment by direct contact membrane distillation

Yeszhanov,

Korolkov,

Güven

et al. 2024

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

“…32–34 Indeed, membrane distillation can be implemented in various configurations with different setups and designs. 35–40 One of the commonly used and cost-effective configurations is direct contact membrane distillation (DCMD). 41–44…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrophobized PET TeMs membrane pore-size on saline water treatment by direct contact membrane distillation

Yeszhanov,

Korolkov,

Güven

et al. 2024

RSC Adv.

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“…MD has been extensively used in the desalination of sea and brackish water where a high water vapor flux is desired, while in solvent recovery, solvent flux and selectivity are important. − During solvent concentration, the solvent and the water flux are related to the overall selectivity, and the goal is to maximize the solvent flux and selectivity. ,− Several factors, such as membrane selection and process parameters, which impact flux and selectivity are important. ,, For example, the effects of temperature, concentration, and flow rate may need to be optimized to optimize selectivity. ,, …”

Section: Introductionmentioning

confidence: 99%

“…Air-sparged MD (ASMD) is a recently developed MD approach where air is sparged during MD to enhance the volatilization of the organic solvents from its aqueous solution. This technique has shown a high flux and reduced fouling during desalination. , Several studies have reported air sparging in various membrane configurations to enhance flux, increase the permeation cycle, and modify selectivity. − …”

Section: Introductionmentioning

confidence: 99%

“…2,21−25 Several factors, such as membrane selection and process parameters, which impact flux and selectivity are important. 13,26,27 For example, the effects of temperature, concentration, and flow rate may need to be optimized to optimize selectivity. 2,28,29 Ethyl acetate (EA) is extensively used in the petrochemical, paint, adhesive, cosmetic, and fine chemical industries as well as in the decaffeination process.…”

Section: Introductionmentioning

confidence: 99%

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Selective Recovery of Ethyl Acetate by Air-Sparged Membrane Distillation Using Carbon Nanotube-Immobilized Membranes and Process Optimization via a Response Surface Approach

Bhoumick

Paul

Roy

et al. 2023

Ind. Eng. Chem. Res.

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Ethyl acetate (EA) is an extensively used industrial solvent, and typically, aqueous mixtures containing EA are discarded as hazardous waste. The recovery of EA from wastewater streams would have significant environmental benefits and be a circular economy approach to solvent recycling. However, with a relatively high water solubility (8.3% w/v at room temperature), it remains a challenge. In this paper, we report the recovery of EA from water using air-sparged sweep gas membrane distillation (AS-SGMD) with carbon nanotube-immobilized membranes. A central composite rotatable design was used to study the effect of process parameters on flux and selectivity via conventional SGMD and AS-SGMD. The experiments were run at different operating conditions of temperature, concentration, and flow rate. The flux reached as high as 1.41 kg/m2 h–1, and selectivity as high as 10.8 was obtained. The introduction of air sparging improved the flux by as much as 12% and the selectivity by 17%. The response surfaces of flux and selectivity as a function of operating variables were studied, and regression models were developed. For both regular SGMD and AS-SGMD, the selectivity of EA recovery followed a quadratic model, while the flux showed a linear response. The predicted and experimental responses were in agreement with a R 2 value of 0.94. The optimization efforts showed that relatively low temperatures, higher concentrations, and high flow rates favored higher selectivity.

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Evaluating the feasibility of direct contact membrane distillation and nanofiltration in ground water treatment through a techno-economic analysis

Elboughdiri,

Cosma,

Amari

et al. 2024

Appl Water Sci

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This study delves into the realm of water treatment by conducting a comprehensive techno-economic evaluation of direct contact membrane distillation (DCMD) and nanofiltration (NF) processes. While previous research has explored the technical aspects of membrane distillation (MD) and nanofiltration, there remains a notable gap in economic analyses. Our research aims to bridge this gap by assessing the financial feasibility of employing MD and NF technologies for water desalination. Specifically, we scrutinize the performance of hydrophobic microporous flat sheet membranes crafted from polytetrafluoroethylene (PTFE) supported by non-woven polypropylene (PP) in desalinating brackish water through DCMD and NF processes. By varying operating conditions such as flow rate and feed temperature, we evaluate the membrane's efficacy. Employing an analytical model based on heat and mass transfer equations, we predict process performance across diverse scenarios. Our model demonstrates a high level of accuracy, with flux predictions deviating by less than 10% when utilizing the Knudsen-molecular mechanism model. Furthermore, through a detailed design and economic analysis of industrial-scale units for both processes, we reveal that the cost of permeated water is lower with NF compared to DCMD. Specifically, our calculations indicate a water cost of 1.34 USD/m3 for DCMD at a feed temperature of 65 °C with an 80% recovery rate, positioning it as a competitive option among conventional desalination methods. Notably, our financial assessment highlights that steam cost constitutes the primary expense in DCMD operations, contingent upon heating value and fuel prices. Noteworthy findings suggest that natural gas emerges as the most cost-effective fuel for steam production in a DCMD plant. This study underscores the economic viability and potential cost efficiencies associated with NF over DCMD in water treatment applications.

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Optimizing the performance of sweeping gas membrane distillation for treating naturally heated saline groundwater

Cited by 12 publications

References 26 publications

Effect of hydrophobized PET TeMs membrane pore-size on saline water treatment by direct contact membrane distillation

Effect of hydrophobized PET TeMs membrane pore-size on saline water treatment by direct contact membrane distillation

Selective Recovery of Ethyl Acetate by Air-Sparged Membrane Distillation Using Carbon Nanotube-Immobilized Membranes and Process Optimization via a Response Surface Approach

Evaluating the feasibility of direct contact membrane distillation and nanofiltration in ground water treatment through a techno-economic analysis

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