Academic literature on the topic 'Microfiltration [MF]'

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Journal articles on the topic "Microfiltration [MF]"

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Park, J., S. Takizawa, H. Katayama, and S. Ohgaki. "Biofilter pretreatment for the control of microfiltration membrane fouling." Water Supply 2, no. 2 (April 1, 2002): 193–99. http://dx.doi.org/10.2166/ws.2002.0063.

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A pilot scale biofilter pretreatment - microfiltration system (BF-MF) was operated to investigate the effect of biofilter treatment in fouling reduction of microfiltration. Biofiltration was expected to reduce the membrane fouling by removal of turbidity and metal oxides. The hollow-fiber MF module with a nominal pore size of 0.1 μm and a surface area of 8m2 was submerged in a filtration tank and microfiltration was operated at a constant flux of 0.5 m/d. Biofiltration using polypropylene pellets was performed at a high filtration velocity of 320 m/d. Two experimental setups composed of MF and BF/MF, i.e. without and with biofilter pretreatment, were compared. Throughout the experimental period of 9 months, biofilter pretreatment was effective to reduce the membrane fouling, which was proved by the result of time variations of trans-membrane pressure and backwash conditions. The turbidity removal rate by biofiltration varied between 40% to 80% due to the periodic washing for biofilter contactor and raw water turbidity. In addition to turbidity, metals, especially Mn, Fe and Al were removed effectively with average removal rates of 89.2%, 67.8% and 64.9%, respectively. Further analysis of foulants on the used membranes revealed that turbidity and metal removal by biofiltration was the major effect of biofiltration pretreatment against microfiltration fouling.
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Gesan, Genevieve, Georges Daufin, Uzi Merin, Jean-Pierre Labbe, and Auguste Quemerais. "Microfiltration performance: physicochemical aspects of whey pretreatment." Journal of Dairy Research 62, no. 2 (May 1995): 269–79. http://dx.doi.org/10.1017/s0022029900030971.

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SUMMARYClarification of whey by microfiltration (MF) can be achieved after appropriate pretreatment of the feed. A control pretreatment consists of a physicochemical process comprising increased ionic calcium and pH accompanied by heat (50 °C, 15 min) to cause aggregation of complex lipid–calcium phosphate particles, which are then separated by MF. This pretreatment process was modified by increasing the temperature to 55 °C and by maintaining the pH constant during heat treatment. This modification resulted in larger calcium phosphate particles and a lower content of soluble calcium and phosphate ions. As a consequence, a longer period of MF operation, better whey clarification and lower calcium and phosphate content of the filtrate were achieved. This suggests that a loosely structured deposit was formed on the membrane surface which was less resistant to filtration than that resulting from the control pretreatment. During MF, it was necessary to avoid zones of high shear in the retentate compartment that might cause physical alteration of the aggregates.
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Dittrich, J., R. Gnirss, A. Peter-Fröhlich, and F. Sarfert. "Microfiltration of municipal wastewater for disinfection and advanced phosphorus removal." Water Science and Technology 34, no. 9 (November 1, 1996): 125–31. http://dx.doi.org/10.2166/wst.1996.0192.

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The objective of Research Project 02 WA 9253/4 on “Advanced Treatment of Municipal Wastewater: Microfiltration of municipal wastewater for disinfection and advanced phosphorus removal” which is supported by the BMBF (Federal Ministry for Education, Science, Research and Technology) is to show whether microfiltration (MF) is a technically feasible and economically competitive process for disinfection and phosphorus removal of secondary effluent. For bacteria and phosphorus removal, three different microfiltration systems (systems with flat sheet, tube and hollow-fibre modules) with a pore size of 0.2 μm are tested in small-scale pilot plants to find out whether they are suitable for municipal wastewater treatment. The most suitable system will afterwards be tested in one full-scale unit to obtain operational data. The monitoring program with the small-scale MF plants using the final effluent of the Berlin-Ruhleben wastewater treatment plant started in November 1993 and the results obtained so far can be summarized as follows. Total coliforms, E. coli, faecal streptococci and salmonella are removed to levels below the detection limit, less than 1 cfu/100 ml in the effluent of all three MF plants. Coliphage - as a surrogate organism for enterovirus - are significantly reduced with a 2-3 log removal, which means that the limit value for enterovirus laid down in the EU Bathing Water Directive can be met in the effluent of the MF plants. The average concentrations for total phosphorus (PT) in the effluent are 60 μg/l for the Memcor and the DOW units and 90 μg/l for the Starcosa unit without the use of precipitants. With a low ferric dosage of 0.014 mol/m3 prior to the MF, the average effluent PT concentrations of all three MF units are lower than the target concentration of 50 μg/l (no polymer feed). With a specific energy consumption of about 0.2 kWh/m3 filtrate the dead-end MF (Memcor) requires at least five times less energy than the cross-flow MF. Based on the energy consumption dead-end MF should be preferred if large volumetric flows of wastewater with a low concentration of solids have to be treated. Because of unfavourable energy consumption the tests with the cross-flow MF have been discontinued. When using MF systems in the final effluent of wastewater treatment plants, evidence must be produced in a full-scale MF unit to demonstrate that microfiltration is really suitable for practical application. This as well as a reliable calculation of investment and operating costs are the main objectives of further investigations within the framework of this research project.
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Tomczak, Wirginia, and Marek Gryta. "Cross-Flow Microfiltration of Glycerol Fermentation Broths with Citrobacter freundii." Membranes 10, no. 4 (April 8, 2020): 67. http://dx.doi.org/10.3390/membranes10040067.

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This paper reports the study of the cross-flow microfiltration (MF) of glycerol fermentation broths with Citrobacter freundii bacteria. A single channel tubular ceramic membrane with a nominal pore size of 0.14 µm was used. It has been demonstrated that the MF ceramic membrane has been successfully applied to bacteria cell removal and to effectively eliminate colloidal particles from glycerol fermentation broths. However, due to fouling, the significant reduction of the MF performance has been demonstrated. In order to investigate the impact of transmembrane pressure (TMP) and feed flow rate (Q) on MF performance, 24 experiments have been performed. The highest steady state permeate flux (138.97 dm3/m2h) was achieved for 0.12 MPa and 1000 dm3/h. Fouling analysis has been studied based on the resistance-in series model. It has been found that the percentage of irreversible fouling resistance during the MF increases with increasing TMP and Q. The permeate flux regeneration has been achieved by membrane cleaning with 3 wt % NaOH and 3 wt % H3PO4 at 45 °C. The results of this study are expected to be useful in industrially employing the MF process as the first step of glycerol fermentation broth purification.
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Qin, Wu, Yi Zhang, and Jianqing Wu. "Preparation of high-permeance ceramic microfiltration membranes using a pore-sealing method." RSC Advances 10, no. 10 (2020): 5560–65. http://dx.doi.org/10.1039/c9ra09805d.

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Furulyás, Diána, Fanni Savanya, Szilvia Bánvölgyi, Nóra Papp, Éva Stefanivots-Bányai, and Mónika Stéger-Máté. "Effects of Enzyme Treatment on the Microfiltration of Elderberry." Analecta Technica Szegedinensia 10, no. 1 (January 15, 2016): 40–46. http://dx.doi.org/10.14232/analecta.2016.1.40-46.

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The aim of this study was to evaluate the effect of microfiltration (MF) on the antioxidant capacity of elderberry juice using ceramic membrane. Previous to MF measurements preliminary examination was achieved with different enzymes. Four different samples were prepared: one without any enzyme and three with different pectolytic enzymes. The resistances were determined using the resistance-in-series model and difference between four enzyme-treated samples are evaluated. The effect of this technology on the antioxidant component of the clarified elderberry juice has been evaluated in permeate and retentate samples. For ferric reducing antioxidant power was measured with FRAP and total phenolic content (TPC) was determined with Folin Ciocalteau reagent. The total anthocyanin content (TAC) was estimated using spectrophotometric method. Higher juice yield was obtained using enzyme compared with enzyme-free elderberry pulp. The analytical results show that the MF membrane retained the valuable components in different rate. Significant losses are believed to have occurred after the MF clarification process due to fouling layer resistance, what can be decreased with pectolytic enzymes treatment.
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Yuasa, Akira. "Drinking water production by coagulation-microfiltration and adsorption-ultrafiltration." Water Science and Technology 37, no. 10 (May 1, 1998): 135–46. http://dx.doi.org/10.2166/wst.1998.0394.

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Microfiltration (MF) and ultrafiltration (UF) pilot plants were operated to produce drinking water from surface water from 1992 to 1996. Microfiltration was combined with pre-coagulation by polyaluminium chloride and was operated in a dead-end mode using hollow fiber polypropylene and monolith type ceramic membranes. Ultrafiltration pilot was operated in both cross-flow and dead-end modes using hollow fiber cellulose acetate membrane and was combined occasionally with powdered activated carbon (PAC) and granular activated carbon (GAC) adsorption. Turbidity in the raw water varied in the range between 1 and 100 mg/L (as standard Kaolin) and was removed almost completely in all MF and UF pilot plants to less than 0.1 mg/L. MF and UF removed metals such as iron, manganese and aluminium well. The background organics in the river water measured as KMnO4 demand varied in the range between 3 and 16 mg/L. KMnO4 demand decreased to less than 2 mg/L and to less than 3 mg/L on the average by the coagulation-MF process and the sole UF process, respectively. Combination of PAC or GAC adsorption with UF resulted in an increased removal of the background organics and the trihalomethanes formation potential as well as the micropollutants such as pesticides. Filtration flux was controlled in the range between 1.5 and 2.5 m/day with the trans-membrane pressure less than 100 kPa in most cases for MF and UF. The average water recovery varied from 99 to 85%.
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Komaladewi, Anak Agung Istri Agung Sri, Putu Teta Prihartini Aryanti, Graecia Lugito, I. Wayan Surata, and I. Gede Wenten. "Recent progress in microfiltration polypropylene membrane fabrication by stretching method." E3S Web of Conferences 67 (2018): 03018. http://dx.doi.org/10.1051/e3sconf/20186703018.

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Microfiltration polypropylene (MF-PP) membrane has been widely used in many industries due to their excellent combination of good separation performances and low production cost. In addition to membrane configuration, the structure of MF-PP membrane also plays an important role in separation performance. MF-PP membrane is commonly produced by thermal induced phase separation (TIPS) and stretching. TIPS is the simplest one where the polymer is dissolved in a solvent at a decent temperature and then cooled to induce phase separation which leads to the formation of microporous structure. However, this method is limited by the nature of PP that is difficult to dissolve in organic solvents and the solvent-contaminated effluent produced during the fabrication process. Therefore, the stretching method is more favorably used. The Stretching method involves four processing stages in sequence (i.e. melt-extrusion, annealing, stretching, and heat setting). Polymer composition, extrusion draw ratio, as well as stretching rate and temperature, are important parameters that significantly affect the pore structures evolved and thus the properties as well as the performances of MF-PP membrane. In this paper, the recent development of MF-PP fabrication by stretching methods as well as the parameters involved in each method will be reviewed and discussed comprehensively.
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Basu, Subhankar, Sangeeta Mukherjee, Ankita Kaushik, Vidya S. Batra, and Malini Balakrishnan. "Integrated treatment of molasses distillery wastewater using microfiltration (MF)." Journal of Environmental Management 158 (August 2015): 55–60. http://dx.doi.org/10.1016/j.jenvman.2015.04.037.

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Noor, M. J. M. M., S. A. Muyibi, T. Ahmed, A. H. Ghazali, A. Jusoh, A. Idris, F. R. Ahmadun, H. Nagaoka, and H. Aya. "Performance of an extended aeration - microfiltration (EAM) reactor in treating high strength industrial wastewater." Water Science and Technology 46, no. 9 (November 1, 2002): 331–38. http://dx.doi.org/10.2166/wst.2002.0272.

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A laboratory study was conducted on an Extended Aeration - Microfiltration (EAM) reactor in treating a food industry wastewater. The reactor contained horizontally laid hollow fibre microfiltration (MF) units that were fully submerged. The MF units were connected to a peristaltic pump that was used to extract permeate continuously under suction pressure. Continuous aeration from beneath the modules provided the crossflow effect to the MF units. Active activated sludge was used in the start-up where the sludge was mixed together with the feed water at a Food/Microorganisms (F/M) value of about 0.1. Primary effluent with Chemical Oxygen Demand (COD) values ranged between 1,500 and 3,000 mg/l was used as feed water. The EAM reactor was operated for nearly three months without initiating cleaning of the MF units. A suction pressure of 0.9 bar and Mixed Liquor Suspended Solids (MLSS) of over 5,500 mg/l were reached when nearing the end of the three month operation period. Permeate COD and turbidity reduction of over 97% and 99% respectively, were achieved. Prior to this, the MF module arrangements were studied; where vertically arranged modules were found to perform poorly as compared to the horizontally laid modules, in terms of clean water permeate flux.
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Dissertations / Theses on the topic "Microfiltration [MF]"

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Riquelme, Breazeal Maria Virginia. "Effect of wastewater colloids on membrane removal of microconstituent antibiotic resistance genes." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34564.

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Anthropogenically generated antibiotic resistance genes (ARGs) are considered emerging contaminants, as they are associated with a critical human health challenge, are persist independent of a bacterial host, are subject to transfer between bacteria, and are present at amplified levels in human-impacted environments. Given the gravity of the problem, there is growing interest in advancing water treatment processes capable of limiting ARG dissemination. This study examined the potential for membrane treatment of microconstituent ARGs, and the effect of wastewater colloids on their removal. Native and spiked extracellular vanA (vancomycin resistance) and blaTEM (β-lactam resistance) ARGs were tracked by quantitative polymerase chain reaction through a cascade of membrane filtration steps. To gain insight into potential associations occurring between ARGs and colloidal material, the wastewater colloids were characterized by scanning electron microscopy, as well as in their protein, polysaccharide, and total organic carbon content. The results suggest that extracellular DNA (eDNA) containing ARGs interacts with wastewater colloids, and can both be protected against degradation and be removed more efficiently in the presence of wastewater colloidal material. Thus, ARG removal may be achievable in sustainable water reuse scenarios using lower cost membranes than would have been selected based on molecular size alone. As membranes are likely to play a vital role in water sustainability, the results of this study enable consideration of ARG removal as part of a comprehensive strategy to manage emerging contaminants and to minimize overall public health risks.
Master of Science
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Kecili, Karima. "Etude et caractérisation de membranes synthétiques organiques immergées de microfiltration (MF) et d'ultrafiltration (UF) employées pour la production d'eau destinée à la consommation humaine : intensification des opérations de déconditionnement et de nettoyage." Paris 6, 2006. http://www.theses.fr/2006PA066371.

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Le durcissement de la législation en terme du traitement et de la qualité de l’eau destinée à la consommation humaine a favorisé le développement des procédés membranaires. L’un des problèmes majeurs qui limitent l’expansion de ces techniques est le phénomène de colmatage et le manque d’outils de prédiction de son apparition en raison d’une insuffisance d’informations sur les matériaux membranaires. Dans le cadre de ce travail nous avons été amenés à caractériser des membranes de microfiltration et d’ultrafiltration, de configuration fibre creuse en polysulfone PS. La charge de ces membranes a été déterminée par des mesures du potentiel d’écoulement et un point isoélectrique de 2,4 ± 0,2 a été trouvé. Cet outil, potentiel d’écoulement couplé aux mesures de perméabilités hydrauliques, nous a permis d’intensifier les procédés de déconditionnement et de nettoyage chimique des membranes étudiées. D’autres outils analytiques supplémentaires (MEB, AFM, Pyrolyse GC/MS, COD, UV à 254 nm, LC-OCD) ont été utilisés pour confirmer les résultats obtenus. Un déconditionnement des membranes par nettoyage chimique au chlore plus rapide et économique a été mis en place. Nous avons montré également qu’un nettoyage à la soude à 0,1 N est plus efficace qu’un nettoyage au chlore (200 ppm) recommandé par le fabricant de ces membranes. L’étude des propriétés colmatantes d’une eau réelle et de solutions synthétiques d’acides humiques a montré que le diamètre des pores joue un rôle dans le phénomène de colmatage. Les membranes MF colmatent plus que les membranes d’UF.
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Book chapters on the topic "Microfiltration [MF]"

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Madaeni, Sayed S. "Microfiltration (MF)." In Encyclopedia of Membranes, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_2208-1.

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Zeman, Leos J., and Andrew L. Zydney. "Characterization of MF/UF Membranes." In Microfiltration and Ultrafiltration, 180–292. Routledge, 2017. http://dx.doi.org/10.1201/9780203747223-5.

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Zeman, Leos J., and Andrew L. Zydney. "Basic Chemistry and Physics of MF/ UF Membranes and Their Precursors." In Microfiltration and Ultrafiltration, 1–50. Routledge, 2017. http://dx.doi.org/10.1201/9780203747223-2.

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Gaikwad, M. S. "Recent Developments of Membrane Technology for Wastewater Treatment." In Advances in Wastewater Treatment II, 68–105. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901397-3.

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The worldwide one major and important issue is the increasing shortage of freshwater. Water is polluted by various category of pollutant such as heavy metal, organic toxic chemical, dyes and others. In such situation providing better solutions for water treatment is a major challenge for researchers. Various techniques have been used in wastewater treatment applications but among those techniques the membrane technology is the most promising technology. This chapter contains recent progress of membrane technology for advanced wastewater treatment, is systematically summarize. This review includes introduction about different membrane technology such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO). Current status of each membrane separation techniques, membrane cleaning techniques, challenges and promising solutions for various wastewater treatment have been discussed.
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Yurekli, Yilmaz. "Principles of Membrane Surface Modification for Water Applications." In Wastewater Treatment [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96366.

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Membrane technologies offer efficient and reliable solutions to separate components from aqueous media. Among them, pressure driven membrane separation processes namely microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) have been preferred in many industrial operations (food, pharmaceutical, chemical, drinking water, wastewater) due to the intrinsic advantages such as high selectivity, stability, ecocompatibility, scalability, flexibility, small footprint and low operational cost. This chapter will focus on the latest developments of surface modified polymeric membranes via the Layer-by-layer self-assembly approach and incorporation/decoration of nanomaterials. Variable parameters including size and charge of polyelectrolyte, ionic strength of the media, number of bilayers, and different types of nanomaterials on the bulk and surface property, water permeability, selectivity, antifouling, antibacterial, and adsorptive properties of the resultant composite membranes will be reviewed by comparison with the neat membranes. Membrane stability in terms of throughput and rejection characteristics during long-term filtrations will be addressed in this chapter.
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Urošević, Tijana, and Katarina Trivunac. "Achievements in low-pressure membrane processes microfiltration (MF) and ultrafiltration (UF) for wastewater and water treatment." In Current Trends and Future Developments on (Bio-) Membranes, 67–107. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-817378-7.00003-3.

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