Vacuum membrane distillation multi-component numerical model for ammonia recovery from liquid streams

Scheepers, Daniëlle; Tahir, Abdullah; Brunner, Christoph; Guillén-Burrieza, Elena

doi:10.1016/j.memsci.2020.118399

Cited by 21 publications

(10 citation statements)

References 64 publications

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“…10,12,39 For NH 3 in the form of gas, in comparison with its ionic form (NH 4 + ), VMD is the most suitable configuration for its recovery, whereas it is not practical in DCMD and AGMD. 35 Additionally, as described in an experimental analysis by Ding et al, 25 VMD has a higher permeation flux for ammonia than DCMD. Despite the advantages of MD technology over conventional methods, some important challenges regarding the application of MD technology remain, including high temperature and concentration polarization, 40,41 membrane pore wetting, 10 and excessive heat conduction loss (except for the VMD configuration).…”

Section: Introductionmentioning

confidence: 95%

“…In the VMD configuration, vacuum pressure is applied on the permeate side of the membrane. This type of MD is suitable for separating aqueous volatile solutions. ,, For NH 3 in the form of gas, in comparison with its ionic form (NH 4 + ), VMD is the most suitable configuration for its recovery, whereas it is not practical in DCMD and AGMD . Additionally, as described in an experimental analysis by Ding et al, VMD has a higher permeation flux for ammonia than DCMD.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, as described in an experimental analysis by Ding et al, VMD has a higher permeation flux for ammonia than DCMD. Despite the advantages of MD technology over conventional methods, some important challenges regarding the application of MD technology remain, including high temperature and concentration polarization, , membrane pore wetting, and excessive heat conduction loss (except for the VMD configuration). ,, The wetting potential of VMD is higher than that of the other MD configurations because of the higher absolute pressure difference between the feed and permeate sides, and the vacuum pumps used on the permeate side have a lower energy efficiency than the hydraulic pumps used in the other MD configurations …”

Section: Introductionmentioning

confidence: 99%

“…Relative errors of approximately 10% were reported in their study by comparing the numerical predictions with experimental measurements of the permeation flux. In a similar study by Scheepers, an experimentally validated 1D multicomponent simulation model of a flat-sheet VMD module was developed by implementing heat and mass balances through the feed, membrane, and permeate channels. A classical approach for the prediction of the mass transfer coefficients was used in this study based on the semiempirical Graetz–Leveque equation for Sherwood, Reynolds, and Schmidt numbers and empirical equations for the Nusselt number .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

CFD Model Development and Experimental Measurements for Ammonia–Water Separation Using a Vacuum Membrane Distillation Module

Shirzadi

Yoshioka

et al. 2022

Ind. Eng. Chem. Res.

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We developed a computational fluid dynamics (CFD) model that can describe the transport phenomena and performance in a vacuum membrane distillation (VMD) module for ammonia−water separation. This model is based on a multicomponent approach that considers the flow, heat transfer, and mass transfer for the liquid phase on the feed side and gaseous phases on the permeate side. The permeation fluxes across the membrane were modeled theoretically based on Knudsen diffusion and Poiseuille flow. A calibration parameter was introduced to compensate for the error in the permeation flux caused by the uncertainty in the membrane properties necessary for the calculation of the permeation flux. To validate the model, we conducted a laboratory-scale VMD experiment for ammonia−water separation. The predicted permeation rate, ammonia recovery ratio, and ammonia concentration on the permeate side were in good agreement with the experimental results at different inlet flow rates on the feed side. The relative errors of the CFD model in the prediction of ammonia permeation rate, recovery ratio, and ammonia concentration on the permeate side were 8, 1, and 5%, respectively. A parametric study of the effect of the inlet ammonia concentration on the feed side and vacuum pressure applied to the permeate side was conducted to understand the flow and mass transfer characteristics, and the relationship with the module performance was discussed. Sensitivity analysis of the process parameters to the module performance was performed using the simulation results obtained from the parametric study.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

CFD Model Development and Experimental Measurements for Ammonia–Water Separation Using a Vacuum Membrane Distillation Module

Shirzadi

Yoshioka

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Development of mathematical models to accurately describe a process is crucial for optimizing nutrient recovery before reengineering wastewater treatment plants into water resource recovery facilities (WRRFs) . MD research has investigated the applicability to remove volatile compounds other than water. , Scheepers et al had developed and applied a VMD model to remove ammonia from wastewater and biogas digestated slurry . Although the model was validated and showed an relative error at 10%, the model showed that VMD cannot preferentially transport volatile compounds from the permeate side and can only control selectivity (25%) with higher feed concentrations (50 g/L NH 3 ).…”

Section: Introductionmentioning

confidence: 99%

Ammonia Recovery with Sweeping Gas Membrane Distillation: Energy and Removal Efficiency Analysis

2022

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Membrane distillation (MD) is a thermally driven phase separation process. In sweeping gas membrane distillation (SGMD), an air stream is utilized to capture and remove volatile compounds on the sweeping gas stream. SGMD is an attractive, compact, and efficient process to replace conventional ammonia removal processes such as air stripping or to reduce energy consumption related to nutrient removal of existing processes in wastewater treatment plants. In this study, we present an energetic analysis of humidity-assisted SGMD to remove ammonia from wastewater. We developed a numerical simulation to optimize the design and operating conditions (inlet feed temperature, air flow rate, brine flow rate, and humidity level of the sweeping gas stream) of the process. We show that operating under multiple stages in series the process can achieve an ammonia removal rate greater than 90% at high air-to-water ratios while maintaining low energy consumption. SGMD is a promising way to separate ammonia from wastewater compared to conventional ammonia stripping processes.

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Numerical simulation on the pressure, turbulence, and λ2 vortex characteristics within the annular symmetric jet process under different vacuum degrees

Chai,

Hu,

Gao

et al. 2024

Asia-Pacific J Chem Eng

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The jet impingement flash technology represents a paramount research subject in the domain of heat and mass transfer. To augment its commercial potential, the conjunction of annular multi‐aperture jet impingement with negative pressure flash evaporation is introduced in this study. The employment of an annular nozzle array is integral to the enhancement of the heat and mass transfer efficiency between the phases. The Realizable k‐ε model is used in this study. The negative pressure flash vaporization model was also developed by introducing a mass source term and an energy source term based on the Mixture model. The flow characteristics are characterized using numerical simulation. Additionally, the λ2 vortex identification criterion is investigated the vortex structure. The simulation results exhibit good agreement with experimental findings, demonstrating that a higher initial vacuum leads to a stronger flashing effect and a more chaotic movement of the flow group within the flow field. Thus, this study provides a reference method for the structural design and optimization of annular symmetric jet impingement negative pressure deammonia chemical equipment for engineering applications.

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Vacuum membrane distillation multi-component numerical model for ammonia recovery from liquid streams

Cited by 21 publications

References 64 publications

CFD Model Development and Experimental Measurements for Ammonia–Water Separation Using a Vacuum Membrane Distillation Module

CFD Model Development and Experimental Measurements for Ammonia–Water Separation Using a Vacuum Membrane Distillation Module

Ammonia Recovery with Sweeping Gas Membrane Distillation: Energy and Removal Efficiency Analysis

Numerical simulation on the pressure, turbulence, and λ2 vortex characteristics within the annular symmetric jet process under different vacuum degrees

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