2 edition of Crossflow microfiltration modelling and mechanical means to prevent membrane fouling found in the catalog.
Crossflow microfiltration modelling and mechanical means to prevent membrane fouling
Guan Mei Zhang
Written in English
Thesis (Ph.D.) - Loughborough University of Technology, 1992.
|Statement||by Guan Mei Zhang.|
Scale-up of microfiltration systems: fouling phenomena and Vmax analysis: by Andrew L. Zydney and Chia-Chi Ho. Desalination () Abstract Proper sizing and scale-up of normal flow filtration devices requires an understanding of the effects of membrane fouling on system capacity. The Vmax test is often used to accelerate testing and. Membrane fouling in microfiltration (MF) and ultrafiltration (UF) of an activated sludge (AS) effluent was investigated. It was found that the major membrane foulants were polysaccharides, proteins, polysaccharide-like and protein-like materials and humic by: Fouling is a phenomenon that occurs in all membrane processes. It is a complex problem, which limits the full operation of this technology. Fouling in pressure-driven membranes (PDMs) has been studied extensively, and the occurrence is well understood in that methods of mitigation have been proposed; however, limitations still occur for their full : Martha Noro Chollom, Sudesh Rathilal. Fouling is the accumulation of unwanted material on solid surfaces to the detriment of function. The fouling materials can consist of either living organisms or a non-living substance (inorganic and/or organic).Fouling is usually distinguished from other surface-growth phenomena in that it occurs on a surface of a component, system, or plant performing a defined and useful function .
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Crossflow microfiltration modelling and mechanical means to prevent membrane fouling The definition, history and applications of Microfiltration (MP) are briefly reviewed in Chapter 1.
The physical mechanisms and mathematical models of the filtration process including concentration polarization (CP), gel polarization (GP) and pore blocking are given in Chapter : Guan Mei Zhang. Crossflow microfiltration membrane fouling and the deposition of solids onto the filter surface have been investigated using a process fluid (seawater), latex and a ground mineral.
The performance of various membrane materials has also been studied, including: acrylonitrile, polypropylene, PTFE, ceramic and stainless steel. Crossflow microfiltration membrane fouling and the deposition of solids onto the filter surface have been investigated using a Crossflow microfiltration modelling and mechanical means to prevent membrane fouling book fluid (seawater), latex and a ground mineral.
Crossflow microfiltration modelling and mechanical means to prevent membrane fouling book performance of various membrane materials has also been studied, including: acrylonitrile, polypropylene, PTFE, ceramic and Crossflow microfiltration modelling and mechanical means to prevent membrane fouling book : Guan Mei Zhang.
The performance of membranes in microfiltration is strongly influenced by the buildup of a fouling layer, which finally may completely plug the porous membrane surface. Several studies have been performed on membrane fouling using bovine serum albumin (BSA) as the foulant by: Microfiltration of model cell suspensions combining macroscopic and microscopic approaches was studied in order to better understand microbial membrane fouling mechanisms.
The respective impact of Saccharomyces cerevisiae yeast and Escherichia coli bacteria on crossflow microfiltration performances was investigated using a multichannel ceramic Cited by: Whatiscrossflowfiltration.
Crossflowfiltration(CFF,alsoknownastangentialflowfiltrationTFF)isafiltration. Effects of transmembrane pressure and cross-flow velocity on the pseudo-steady filtration flux.
The flux attenuation during a cross-flow microfiltration is mainly due to the membrane fouling. The macromolecules in the suspension may adsorb onto the membrane surface or in the membrane pores to form a fouled by: Microfiltration Membrane Fouling in Water Treatment: Impact of Chemical Attachments by Haiou Huang Membrane fouling is the loss of membrane permeability as a result of the accumulation of aquatic materials on membrane surfaces.
It was hypothesized in this study that the origin of MF membrane fouling is the chemical attachment of these. In this paper, the effects of the operating pressure and cross-flow velocity on the membrane performance and the individual resistances in microfiltration of whey for both unsteady and steady-state conditions were investigated for two µm mean pore size polymeric membranes, Polyethersulfone (PES) and Polyvinylidene fluoride (PVDF).
An important aspect of modeling in microfiltration is to follow up the decrease of flux in conditions of membrane fouling. This is often done by using the resistance-in-series model (in contrast to pore blocking models, not considered here), which considers a foulant layer as an additional mass transfer resistance.
The aim of this study was to investigate the individual impact on wine molecules as tannins, pectins and mannoproteins on multichannel ceramic membrane fouling during wine cross-flow microfiltration. The characterization of fouling mechanisms involved in the previous filtrations was realized by using the classical fouling models and the analysis of the total resistance Cited by: Without reliable mathematical modeling, the automated plants are vulnerable to membrane fouling because this problem could not be predicted properly in the initial stage, and it will be too late to prevent the fouling problem when it is by: 2.
"a well-written and documented text. This book can be considered the comprehensive reference for microfiltration and ultrafiltration techniques and principles. Scientists interested in an in-depth analysis of Crossflow microfiltration modelling and mechanical means to prevent membrane fouling book techniques of membrane filtration will want to add this reference to their library.
"Sim-News. Mathematical models of membrane fouling in cross-flow Modelling the microfiltration of lactic acid fermentation. crossflow microfiltration systems., Desalination, Influence of Crossflow Microfiltration on Ceramic Membrane Fouling and Beer Quality Article in Desalination and water treatment 51() June.
cross-flow microfiltration. They incorporated the effect of cross-flow into the constant-pressure, blocking filtration equation developed by Hermia () for dead-end filtration and derived a general equation to represent the decline of permeate flux with time.
Their model will be discussed in detail later in this paper. Koltuniewicz et al. Abstract. Compared to deadend filtration, in crossflow filtration (also called tangential flow or inertial filtration) pressure drives only part of the feed through the medium; the remaining feed flows tangentially along the surface of the medium, continuously sweeping particles from the medium’s surface back into the by: Cross-flow microfiltration with ceramic membranes was applied for beer recovery from tank bottoms.
The cross-flow microfiltration was optimised using model yeast suspension and the effects of pore. A mechanistic model was developed to represent the fouling of a cross-flow microfiltration membrane operated at constant permeate flux. Fouling was observed as an increase in the transmembrane pressure (TMP) and assumed to occur first by pore blockage followed by cake formation over the blocked : Maja Stressmann.
crossflow microfiltration pilot plant equipped with ceramic membranes with a m 2 total effective filtration area and mean pore diameter of µm. The juice was evaluated at transmembrane pressuresand bar, and at temperatures of 30, 35 and 40”C at different volumetric reduction factors.
The tests. Cost Modeling and Estimation of Crossflow Membrane Filtration Processes Article in Environmental Engineering Science 17(2) March. Cross-flow filtration (CFF) is also known as tangential flow filtration, which is not of recent origin.
It began with the development of reverse osmosis (RO) more than three decades ago. Abstract. In this chapter, recent theories describing crossflow microfiltration behavior are presented.
First, the use of macroscopic balances to describe the overall behavior of various microfiltration module configurations is briefly by: membrane fouling during cross-flow microfiltration of wine. () Innovative Food Science and Emerging Technologies, vol. 16 pp. ISSN Open Archive Toulouse Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where by: A mechanistic model was developed to represent the fouling of a cross-flow microfiltration membrane operated at constant permeate flux.
Fouling was observed as an increase in the transmembrane pressure (TMP) and assumed to occur first by pore blockage followed by cake formation over the blocked pores. The effect of the cross-flow action was Author: Maja Stressmann.
Analysis of the Membrane Fouling on Cross-flow Ultrafiltration and Microfiltration of Soy Sauce Lees Although since the 's Japanese soy sauce manufactures have developed cross-flow membrane filtration systems to recover soy sauce from its lees, the mechanisms by which the membrane fouls during filtration have not been theoretically.
most attractive methods for modeling membrane filtration until now (Al-Abri and Hilal, ; Aydiner et al., ; Chen and Kim, ; Sahoo and Ray, ). Dornier et al. () first used BPNNs to predict the dynamic process of membrane fouling during cross-flow microfiltration of crane sugar.
They studied the. The membrane is not a consumable component. The differences in these two filtration processes are displayed in the graphic below.
Microfiltration and Cross flow Filtration. Microfiltration is a separation process utilized to remove particles typically in the to 10 micron range.
Yeast-foulant removal via reverse filtration from cellulose acetate microfiltration membranes was observed in situ using a direct visual observation (DVO) microvideo system. The sizes of the foulant blockages increased with filtration time as cells aggregated on the membrane surface and in the suspension.
Coupling of the DVO-determined fractional coverage data with Cited by: membrane must be chosen to ensure that the crossflow over the membrane can remove the boundary layer—which forms at the surface of the membrane—at a rate faster than it is formed.
Last but not least, the bacteriological conditions of the feed and in the plant must be controlled to prevent growth of microorganisms Reverse Osmosis Membranes. where ΔP (Pa) is transmembrane pressure, μ (Pa-s) is the solution viscosity and Rm (1/m) is the hydrodynamic resistance of clean membrane.
Additional work has been done to relate R ⌢ c to the structure of the cake layer formed by particles or aggregates [19, 20].The cake filtration model has been used to fit filtration data and reasonable results have been obtained .Cited by: Milk protein fractionation by microfiltration membranes is an established but still growing field in dairy technology.
Even under cross-flow conditions, this filtration process is impaired by the formation of a deposit by the retained protein fraction, mainly casein micelles. Due to deposition formation and consequently increased overall filtration resistance, the mass flow of the smaller.
Understanding Direct Flow and Crossflow Microfiltration in Food and Beverage Industry Applications Overview Food and beverage production spans a wide range of process applications, which require contaminant removal or separations of components in liquids and gases, with the goal of achieving high product Size: 1MB.
surface-renewal model of cross-flow microfiltration A schematic of cross-flow microfiltration is shown in Fig. In the surface-renewal model developed in this work (Fig. 2), it is postulated that the dominant fouling mechanism responsible for permeate flux decline is cake formation.
The research on electro-conductive membranes has expanded in recent years. These membranes have strong prospective as key components in next generation water treatment plants because they are engineered in order to enhance their performance in terms of separation, flux, fouling potential, and permselectivity.
The present review summarizes recent Cited by: Sintered stainless steel (SSS) microfiltration membranes, which served as electrode directly, were used for the experiment of separating Alamin, a calcium salt and protein containing particles, found in dairy processing. Fouling and cleaning of the SSS membranes under the application of an external electric field were studied.
The imposed electric field was found, diverging the pH Cited by: 4. Cross-flow membrane filtration technology has been used widely in industry around the globe. Filtration membranes can be polymeric or ceramic, depending upon the application. The principles of cross-flow filtration are used in reverse osmosis, nanofiltration, ultrafiltration and microfiltration.
The study of the effect of operating parameters on the fouling of a ceramic microfiltration membrane The study of the effect of operating parameters on the fouling of a ceramic microfiltration membrane (velocities and pressures) using real effluent showed that the maximum permeate flux was obtained at m/s and 2 bar; it was about l/h.m2.
Membrane filtration (microfiltration and ultrafiltration) has become an accepted process for drinking water treatment, but membrane fouling remains a significant problem.
The objective of this study was to systematically investigate the mechanisms and components in natural waters that contribute to fouling. Natural waters from five sources were filtered in a benchtop filtration Cited by: Synder’s Custom Solutions. > Custom Membrane Development.
> Membrane Feasibility Tests. > Membrane Resources. Applications in the Oil and Gas Industry. > New NFS™ Membrane for Sulfate Removal. The science behind membranes.
Membrane separation processes. > Nanofiltration, Ultrafiltration, Microfiltration. Membrane technology at work. In this paper, the effects of the operating pressure and crossflow velocity pdf the membrane performance and the individual resistances in microfiltration of whey for both unsteady and steady-state conditions were investigated for two µm mean pore size polymeric membranes, Polyethersulfone (PES) and Polyvinylidene fluoride (PVDF).The MemTriq® is based on a cross-flow filtration process.
The biomass is filtered in a filter installation download pdf to the bioreactor. The membrane modules are placed in a pressurized circulation loop located outside the bioreactor. Membrane fouling is prevented by the use of the shear forces created by the cross-flow operation of the membranes.ebook Membrane fouling is often characterized using ebook crossflow filtration apparatus.
Typically, the transmembrane pressure (TMP) difference is fixed, and the flux is allowed to decline as the membrane fouls and the resistance to mass transfer increases.
However, as flux varies, so too does the rate at which foulants are brought to the membrane surface, so the observed fouling Cited by: