Crossflow microfiltration – state of the art

Ripperger, Siegfried; Altmann, Justus

doi:10.1016/s1383-5866(01)00113-7

Cited by 160 publications

(97 citation statements)

References 21 publications

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“…Altmann [84]. Cheryan [85] claimed that particles which are bigger than the 408 membrane pores could be induced under shear force generated by cross-flow 409 velocity, this caused the membranes to become mobilized on the membrane surface 410 thus limiting the effect of fouling.…”

Section: Operational Conditions Of Water Purification Device 364mentioning

confidence: 99%

Membrane-Based Point-Of-Use Water Treatment (PoUWT) System in Emergency Situations

Shamsuddin

Das

Starov

2014

Separation & Purification Reviews

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Citation: SHAMSUDDIN, N., DAS, D.B. and STAROV, V., 2016. Membranebased point-of-use water treatment (PoUWT) system in emergency situations: a review. Separation and Purification Reviews, 45 (1), pp. 50-67. During emergency situations, effective and quick reactions are vital in order to supply 7 safe and unpolluted drinking water within approved guidelines Point-of-use water 8 treatment (PoUWT) system, for instance, portable membrane-based water treatment 9 devices, could help affected people to survive while waiting for aids to arrive. In the 10 context of portable membrane-based water purification devices, it is also found that 11 the most literature does not mention particle depositions and interactions, and 12 membrane fouling mechanisms that might occur in these devices.

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Section: Operational Conditions Of Water Purification Device 364mentioning

confidence: 99%

Membrane-Based Point-Of-Use Water Treatment (PoUWT) System in Emergency Situations

Shamsuddin

Das

Starov

2014

Separation & Purification Reviews

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“…Depending on the operational parameters of the system and the properties of the suspension, crossflow filtration can be operated at equilibrium flux rates similar to the clean water flux (Bacchin et al 2006) or can be as low as 5 to 10% of the initial flux at the start of filtration operations (Christensen et al 2009). As further discussed in 3.3 Christensen, the lowest steady state fluxes typically occur for dispersions with particles in the colloidal size range (i.e., 10 nm to 1 μm) (Sethi andWiesner 1997, Ripperger andAltmann 2002).…”

Section: The Impact Of Time Process Operating Conditions and Propermentioning

confidence: 99%

“…That being stated, cake formation is considered to be the dominant form of filter resistance and filter fouling (Ripperger andAltmann 2002, Christensen et al 2009) and is the focus of many filter fouling and flux evolution studies. The applicability of this assertion to the broad range of filtration encountered in the literature is not clear, as a recent study by found that models for both pore blocking and cake formation had to be considered when trying to model the fouling of alumina membranes of varying pore size (0.2 to 5 m) during filtration of a Cr(OH) 3 suspension.…”

Section: The Impact Of Time Process Operating Conditions and Propermentioning

confidence: 99%

A Brief Review of Filtration Studies for Waste Treatment at the Hanford Site

Daniel¹,

Schonewill²,

Shimskey³

et al. 2010

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SummaryThis document completes the requirements of Milestone 1-2, PNNL Draft Literature Review, discussed in the scope of work outlined in the EM-31 Support Project task plan WP-2.3.6-2010-1. The focus of task WP-2.3.6 is to improve the U.S. Department of Energy's (DOE's) understanding of filtration operations for high-level waste (HLW) to enhance filtration and cleaning efficiencies, thereby increasing process throughput and reducing the sodium demand (through acid neutralization). Developing the processes for fulfilling the cleaning/backpulsing requirements will result in more efficient operations for both the Hanford Tank Waste Treatment and Immobilization Plant (WTP) and the Savannah River Site (SRS), thereby increasing throughput by limiting cleaning cycles.The purpose of this document is to summarize Pacific Northwest National Laboratory's (PNNL's) literature review of historical filtration testing at the laboratory and of testing found in peer-reviewed journals. Eventually, the contents of this document will be merged with a literature review by SRS to produce a summary report for DOE of the results of previous filtration testing at the laboratories and the types of testing that still need to be completed to address the questions about improved filtration performance at WTP and SRS. To this end, this report presents 1) a review of the current state of crossflow filtration knowledge available in the peer-reviewed literature, 2) a detailed review of PNNLrelated filtration studies specific to the Hanford site, and 3) an overview of current waste filtration models developed by PNNL and suggested avenues for future model development.This extensive review provides a starting point to help achieve the ultimate goal of the current project, which is to identify technologies such as modifications to the process (e.g., reconfiguration of the filter geometry or changes to operational techniques) or the use of physical property modifiers that increase the sustainability of the filter process. Overall, two avenues of future model development are recommended: 1) determination of long-term filtration dynamics of actual waste and waste simulant slurries and 2) evaluation of the impact of solution chemistry on the rate of filtration and filter fouling. A better understanding of these long-term fouling dynamics and solution chemistry effects will help in developing better predictive models and improved process optimization.v

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“…Richardson and Nassehi [42] developed a Streamline Upwind Petrov Galerkin (SUPG) finite element scheme to model the free flow domains having curved porous boundaries with a specialised case of cross-flow membrane filtrations. Ripperger and Altmann [6] have discussed in detail the historical developments in the cross-flow filtration along with the mechanisms behind particle depositions on the membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Development of a predictive mathematical model for coupled stokes/Darcy flows in cross-flow membrane filtration

Hanspal

Waghode

Nassehi

et al. 2009

Chemical Engineering Journal

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a b s t r a c tFree flow regimes accompanied by porous walls feature commonly in a variety of natural processes and industrial applications such as groundwater flows, packed beds, arterial blood flows and cross-flow and dead-end filtrations. Cross-flow microfiltration or ultrafiltration processes are generally employed in a range of industrial situations ranging from oil to medical applications. The coupled free/porous fluid transport phenomenon plays an equally important role along with the particle transport mechanisms concerning the separation efficiency of cross-flow membrane filtration. To provide a theoretical background for the experimental outcomes of cross-flow filtration, a mathematically sound model is desired which can reliably represent the interfacial boundary whilst maintaining the continuity of flow field variables across the interface between the free and porous flow regimes. Notwithstanding the numerous attempts reported in the literature, the development of a generic mathematical model for coupled flows has been prohibited by the complexities of interactions between the free and the porous flow systems. Henceforth, the aim of present work is to gain a better mathematical understanding of the interfacial phenomena encountered in coupled free and porous flow regimes applicable to cross-flow filtration systems. The free flow dynamics can be justifiably represented by the Stokes equation whereas the non-isothermal, non-inertial and incompressible flow in a low permeability porous medium can be handled by the Darcy equation. Solutions to the system of partial differential equations (PDEs) are obtained using the finite element method employing mixed interpolations for the primary field variables which are velocity and pressure. A nodal replacement scheme previously developed by the same authors has been effectively enforced as the boundary constraint at the free/porous interface for coupling the two physically different flow regimes in a single mathematical model. A series of computational experiments for permeability values of the porous medium ranging between 10 −6 and 10 −12 m 2 have been performed to examine the susceptibility of the developed model towards complex and irregular shaped geometries. Our results indicate that at high permeability values, the discrepancy in mass balance calculations is observed to be significant for a curved porous surface, which may be attributed to the inability of the Darcy equation to represent the flow dynamics in a highly permeable medium. At a low permeability, a very small amount of fluid permeated through the free/porous interface as most of the fluid leaves the domain through the free flow exit. The geometry and permeability of the free/porous interface are found to affect the amount of fluid passing through the porous medium significantly. All the numerical solutions that are presented have been theoretically validated for their accuracy by computing the overall mass continuity across the computational domains.

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Crossflow microfiltration – state of the art

Cited by 160 publications

References 21 publications

Membrane-Based Point-Of-Use Water Treatment (PoUWT) System in Emergency Situations

Membrane-Based Point-Of-Use Water Treatment (PoUWT) System in Emergency Situations

A Brief Review of Filtration Studies for Waste Treatment at the Hanford Site

Development of a predictive mathematical model for coupled stokes/Darcy flows in cross-flow membrane filtration

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