Effect of Fouling Conditions and Cake Layer Structure on the Ultrasonic Cleaning of Ceramic Membranes

Lamminen, Mikko; Walker, Harold W.; Weavers, Linda K.

doi:10.1080/01496390600997641

Cited by 27 publications

(9 citation statements)

References 26 publications

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“…Therefore, a uniform fouling reagent with tunable surface charge is essential to describe the role of electrostatic interaction while membrane fouling, e.g., polystyrene (PS) beads. As already described by several groups, PS beads can be used as model fouling reagent [31][32][33][34][35][36][37][38][39][40][41][42][43][44]. Nevertheless, an investigation regarding the fouling of differently charged PS beads is missing so far.…”

Section: Polystyrene Beads As Model Fouling Reagentmentioning

confidence: 99%

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

et al. 2015

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Abstract:In this work we aim to show that the overall surface potential is a key factor to understand and predict anti-fouling characteristics of a polymer membrane. Therefore, polyvinylidene fluoride membranes were modified by electron beam-induced grafting reactions forming neutral, acidic, alkaline or zwitterionic structures on the membrane surface. The differently charged membranes were investigated regarding their surface properties using diverse analytical methods: zeta potential, static and dynamic water contact angle, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Porosimetry measurements proved that there is no pore blocking due to the modifications. Monodisperse suspensions of differently charged polystyrene beads were synthesized by a radical emulsion polymerization reaction and were used as a model fouling reagent, preventing comparability problems known from current literature. To simulate membrane fouling, different bead suspensions were filtered through the membranes. The fouling characteristics were investigated regarding permeation flux decline and concentration of model fouling reagent in filtrate as well as by SEM. By considering electrostatic interactions equal to hydrophobic interactions we developed a novel fouling test system, which enables the prediction of a membrane's fouling tendency. Electrostatic forces are dominating, especially when charged fouling reagents are present, and can help to explain fouling characteristics that cannot be explained considering the surface wettability.

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Section: Polystyrene Beads As Model Fouling Reagentmentioning

confidence: 99%

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

et al. 2015

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“…In particular, the effectiveness of ultrasonic cleaning to remove polystyrene latex particles deposited on aluminum membranes was studied at different pH and ionic strength values in Lamminen et al (2006). In this study, it was observed that solution conditions (pH and ionic strength) had a much greater impact on cleaning effectiveness than particle size.…”

Section: 13mentioning

confidence: 88%

“…The weakness of cake inferences from flux is that they do not allow direct observation of cake thickness or morphology. Post-filtration imaging of filter cakes by SEM has been used to study cake thickness (see Lamminen et al 2006), and while this technique provides significant insight on cake thickness, SEM can occur only after the filtration experiment is complete. Furthermore, imaging requires preparing the specimen, which may alter the cake.…”

Section: 7mentioning

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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“…The use of an ultrasonic field has been studied widely in membrane filtration systems for both flux enhancement during fouling [5][6][7][8][9][10][11][12][13] and to improve cleaning efficiency [14][15][16][17]. When an acoustic field is applied to a liquid, acoustic cavitation, a phenomenon in which bubbles present in the liquid medium grow and collapse due to pressure fluctuations caused by ultrasound waves, is generated.…”

Section: Introductionmentioning

confidence: 99%

The use of ultrasonic feed pre-treatment to reduce membrane fouling in whey ultrafiltration

Koh

Nguyen

Chandrapala

et al. 2014

Journal of Membrane Science

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The production of whey protein concentrate powders is often limited by the fouling of the ultrafiltration membranes and the low heat stability of the whey protein solutions. Ultrasonic treatment of whey solutions has previously been shown to break down protein aggregates and improve heat stability. This study investigates the use of ultrasound as a pre-treatment step to improve downstream ultrafiltration performance. Results show that sonication alone alleviated membrane fouling to a small extent. However, the use of ultrasound following heat exposure reduced membrane pore blockage and growth of the foulant cake greatly, relative to heat exposure in the absence of ultrasound. The extent of changes to pore blockage and cake growth was greater at higher solids concentration. In all cases, the protein concentration in the permeate remained unchanged. This work has the potential to reduce energy requirements in the ultrafiltration of whey as feed pre-treatment by both ultrasound and the combination of heat and ultrasound produced a lower viscosity feed solution.

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Effect of Fouling Conditions and Cake Layer Structure on the Ultrasonic Cleaning of Ceramic Membranes

Cited by 27 publications

References 26 publications

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

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

The use of ultrasonic feed pre-treatment to reduce membrane fouling in whey ultrafiltration

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