Effect of water-swollen organic materials on crossflow filtration performance

Christensen, Morten Lykkegaard; Nielsen, Troels Bach; Andersen, Morten Boel Overgaard; Keiding, Kristian

doi:10.1016/j.memsci.2009.02.007

Cited by 11 publications

(4 citation statements)

References 29 publications

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“…For cakes formed by wastewater sludge, there is a linear dependency between pressure and resistance due to its extreme compressibility i.e. n is equal to 1, [ 19 , 20 ]. Thus, Eq 3A can be reduced to Eq 3B …”

Section: Methodsmentioning

confidence: 99%

Membrane filtration device for studying compression of fouling layers in membrane bioreactors

Jørgensen¹,

Bugge

Larsen³

et al. 2017

PLoS ONE

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A filtration devise was developed to assess compressibility of fouling layers in membrane bioreactors. The system consists of a flat sheet membrane with air scouring operated at constant transmembrane pressure to assess the influence of pressure on resistance of fouling layers. By fitting a mathematical model, three model parameters were obtained; a back transport parameter describing the kinetics of fouling layer formation, a specific fouling layer resistance, and a compressibility parameter. This stands out from other on-site filterability tests as model parameters to simulate filtration performance are obtained together with a characterization of compressibility. Tests on membrane bioreactor sludge showed high reproducibility. The methodology’s ability to assess compressibility was tested by filtrations of sludges from membrane bioreactors and conventional activated sludge wastewater treatment plants from three different sites. These proved that membrane bioreactor sludge showed higher compressibility than conventional activated sludge. In addition, detailed information on the underlying mechanisms of the difference in fouling propensity were obtained, as conventional activated sludge showed slower fouling formation, lower specific resistance and lower compressibility of fouling layers, which is explained by a higher degree of flocculation.

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Section: Methodsmentioning

confidence: 99%

Membrane filtration device for studying compression of fouling layers in membrane bioreactors

Jørgensen¹,

Bugge

Larsen³

et al. 2017

PLoS ONE

Self Cite

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“…Compressibility observed in cakes formed by inorganic particles is typically considered irreversible (McCarthy et al 2002). Cakes formed by cellular materials show reversible cake compression; as shown recently by Christensen et al (2009), the reversible compression of cellular materials can be reproduced by attaching a water-swellable polymeric coating to hard sphere particles.…”

Section: 7mentioning

confidence: 95%

“…This is a consequence of the backtransport of solids away from the surface induced by crossflow. 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%

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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“…Several efforts have been devoted to analyze the viscoelastic compression behaviors of cake formed by soft particles in recent years. Christensen et al 19) measured the hydraulic pressure at the sample-piston interface to correct the overestimation of the transition time of cake consolidation using conventional theory.…”

Section: Effect Of Cake Compressionmentioning

confidence: 99%

Membrane Filtration of Soft Colloids

Hwang

2014

membrane

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The solid-liquid separation of soft particles or colloids, such as water gels, proteins, emulsions, microbial cells and flocs, has become increasingly important in biochemical, food, biomedical, pharmaceutical, wastewater treatment, and chemical industrial processes in recent years for the production or recovery of high-quality or high-valuable products. Comparing with the filtration of rigid particles, the filtration of soft colloids exhibits more complex behaviors which causes much difficult in filtration analysis and device selection. The typical filtration phenomena of soft colloids, including particle deformation, creeping cake compression and liquid transfer across the interface between colloids and surroundings solvent, always result in a filter cake with extremely high specific cake filtration resistance and extremely low cake porosity. A thin compact cake layer is formed next to the membrane surface which exhibits most filtration resistances. Soft colloids are therefore very hard-to-filtered. In this article, the features of the filtration of soft colloids are described. The current development in filtration mechanisms and future prospects are reviewed and presented.

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Effect of water-swollen organic materials on crossflow filtration performance

Cited by 11 publications

References 29 publications

Membrane filtration device for studying compression of fouling layers in membrane bioreactors

Membrane filtration device for studying compression of fouling layers in membrane bioreactors

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

Membrane Filtration of Soft Colloids

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