OMSD – An open membrane system design tool

Aschmoneit, Fynn Jerome; Hélix-Nielsen, Claus

doi:10.1016/j.seppur.2019.115975

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…The design and the development of the next-generation membranes for reverse osmosis (RO), nanofiltration (NF), forward osmosis, and other separation processes based on high selectivity between water and solutes or among solutes, cannot do without robust membrane characterization protocols and transport modeling tools [1,2,3,4]. In turn, the deployment of current and future membranes in high-value applications require the ability to predict system performance, chiefly membrane flux, in the presence of transport-limiting phenomena, such as concentration polarization [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Accounting for concentration polarization means knowing or being able to predict the hydrodynamics condition of the membrane feed channel, whether in laboratory setups or in full-scale modules [15,16]. When the transport parameters of a membrane are known, adequate prediction of water flux that the same membrane would provide becomes possible under a variety of engineering conditions or applications, also with the goal to support the design of such systems [17,4]. The fluid dynamics in the feed channel are governed by the convection-diffusion equation and the separation characteristics of the membrane.…”

Section: Introductionmentioning

confidence: 99%

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Towards standardized and simplified practices in membrane science: new simplified equations and a proposed protocol for membrane characterization and water flux prediction

Aschmoneit

Tiraferri

Malaguti

et al. 2023

Preprint

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The development of new membranes, membrane materials, and membrane-based separation processes should be accompanied by a standardization of the protocols applied for membrane characterization and for data analysis by the community of academic and industrial stakeholders. For example, there exists no recognized and robust protocol for membrane characterization, with characterization conditions often unreported or unclear, which impairs reproducibility and the possibility of comparison between data originated from different stakeholders. Also, regarding membrane analysis, one of the obstacles to the simple use of the classical transport equations to extract membrane transport parameters and to perform predictive flux calculations, is the fact that the magnitude of concentration polarization must be known, which is not always the case and in all cases complicates calculations requiring numerical solutions. Here, a protocol for the experimental characterization of the transport properties of dense membranes is discussed and the results are compared to those expected from classical models of species transport. In addition, new, streamlined equations for the calculation of the water flux and of the solute permeability coefficient in pressure-driven dense membrane processes and in the presence of salt in the feed stream are presented. In contrast to the classical mathematical expression for water flux, the respective equation proposed in this study is algebraic. This characteristic poses the advantage of simple calculation, whereas the classical equation needs to be solved iteratively or numerically. Moreover, in contrast to the solution of the traditional expression for the solute permeability coefficient, which requires knowledge of the hydrodynamics conditions to estimate the magnitude of concentration polarization, the respective equation proposed in this study only requires readily available bulk parameters. Non-dimensional variables for water flux, driving pressure, and mass transfer are introduced as parameters of the new equations. In particular, the non-dimensional variables address the effect of concentration polarization and relate this phenomenon directly to a decline in water flux, allowing for the definition of a filtration efficiency, a useful parameter also in terms of process design.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards standardized and simplified practices in membrane science: new simplified equations and a proposed protocol for membrane characterization and water flux prediction

Aschmoneit

Tiraferri

Malaguti

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The design and the development of the next-generation membranes for reverse osmosis (RO), nanofiltration (NF), forward osmosis, and other separation processes based on high selectivity between water and solutes or among solutes, cannot do without robust membrane characterization protocols and transport modeling tools [1][2][3][4] . In turn, the deployment of current and future membranes in high-value applications requires the ability to predict system performance, chiefly membrane flux, in the presence of transport-limiting phenomena, such as concentration polarization [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, when the transport characteristics of a membrane are known, adequate predictions of the water flux become possible under a variety of engineering conditions or applications, also with the goal to support the design of such systems 4,17 . One of the main obstacles for the correct predictions of water flux or for the calculation of the transport parameters, is that concentration polarization must be taken into account 18 .…”

Section: Introductionmentioning

confidence: 99%

Standardizing practices and flux predictions in membrane science via simplified equations and membrane characterization

Tiraferri,

Malaguti,

Mohamed

et al. 2023

npj Clean Water

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The development of membranes and membrane-based separation processes should be accompanied by a standardization of the protocols applied for membrane characterization and for data analysis. Here, streamlined equations for the estimation of the water flux and of the observed salt permeability coefficient in pressure-driven processes deploying dense membranes are presented. Also, a protocol for the experimental characterization of the transport properties of dense membranes is presented and the results are validated against the proposed equations. The proposed water flux equation is algebraic, whereas the ordinary equation needs to be solved iteratively. Moreover, in contrast to the traditional expression for the solute transport coefficient, which requires estimation of the concentration polarization, the respective equation proposed in this study only requires bulk parameters. Dimensionless variables for water flux, driving pressure, and mass transfer are introduced, and a filtration efficiency is defined, a useful parameter in terms of process design.

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Modeling and simulation for design and analysis of membrane-based separation processes

Kancherla

Nazia

Kalyani

et al. 2021

Computers & Chemical Engineering

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OMSD – An open membrane system design tool

Cited by 4 publications

References 4 publications

Towards standardized and simplified practices in membrane science: new simplified equations and a proposed protocol for membrane characterization and water flux prediction

Towards standardized and simplified practices in membrane science: new simplified equations and a proposed protocol for membrane characterization and water flux prediction

Standardizing practices and flux predictions in membrane science via simplified equations and membrane characterization

Modeling and simulation for design and analysis of membrane-based separation processes

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