Aerosol filtration

Friedlander, S. K., "Aerosol Filtration by Fibrous Filters," in Biochemical and Biological Engineering Science, vol 1., ed. N. Blakebrough. London, England Academic Press, Inc., 1967, pp. 49 - 67. 

Kogan, V., Kuhlman, M.R., Coutant, R.W. and Lewis, R.G. (1993) Aerosol filtration by sorbent beds. Journal of the Air sj Waste Management Association, 43,... 

Collection on porous filter media is perhaps the most efficient means of particle removal. Aerosol filtration is an effective means of air purification, while at the same time it has been widely used for sampling airborne material for mass and chemical composition determination. A wide variety of filter media is available, ranging from fibrous mats of relatively inert material to porous membranes. Fibrous mats and model filter arrays appear microscopically as stacks of overlaid cylinders, where the cylinders may be smooth or rough. In contrast, the membrane media are plastic films with microscopic holes of nearly uniform size nuclepore filters, for example, are produced of sheets of polyester, and the holes are introduced by neutron bombardment. 

Lee KW, Liu B Y H. Theoretical study of aerosol filtration by fibrous filters. Aerosol Sci Technol 1982 1 147-161. 

Application Maleic anhydride general Aerosol filtration Coal combustion... 

Type of Reaction and Application. An increased emphasis on gas-solid reactions has been evident for about a decade. Three of the papers in this symposium treat gas-solid reactions, two (13,18) dealing with coal combustion and the other (11) with catalyst regeneration. Of the four papers which consider solid-catalysed gas-phase reactions, one (15) deals with a specific application (production of maleic anhydride), and one (12) treats an unspecified consecutive reaction of the type A B C the other two (14,16) are concerned with unspecified first order irreversible reactions. The final paper (17) considers a relatively recent application, fluidized bed aerosol filtration. Principles of fluid bed reactor modeling are directly applicable to such a case Aerosol particles disappear by adsorption on the collector (fluidized) particles much as a gaseous component disappears by reaction in the case of a solid-catalysed reaction. 

Schreuder-Gibson, H. and Gibson, P, 2002. Use of electrospun nanofibers for aerosol filtration in textile structures. Proceedings of the 23rd Army Science Conference, December 2-5, Orlando, FL. 

Subbiah, T., and Ramkumar, S.S., 2004a. Composite nanofibers substrates for high efficiency aerosol filtration. Proceedings ofthe 14th Annual TANDEC Conference, University of Tennessee, Knoxville, TN, November 9-11, pp. 4.2.1-4.2.11. 

Flow normal to a right circular cylinder is the basic model for the theory of aerosol filtration by fibrous and cloth filters, and of particle collection by pipes and rods in a flow (Fig. 3.1). The aerosol concentration at large distances from the surface is uniform at one particle radius from the surface, the concentration vanishes. 

Billings, C. E. (1966) EJfevts of Parlide At ciintulatioti in Aerosol Filtration, PhD thesis in Environmental Health Engineering, California Institute of Technology. 

Spurny KR, Lodge JP Jr, Frank ERand Sheelsley DC (1979) Aerosol filtration by means of nucleopore filters structural and filtration properties. Environ Sci Technol 3 453. 

Aerosol Filtration, Ph.D. dissertation, California Institute of Technology, Pasadena, 1966), forming chainlike agglomerates termed dendrites. The growth of dendritic deposits on fibers has been studied experimentally [Billings, op. cit. Bhutra and Payatakes,/. Aerosol Sci., 10, 445 (1979)], and Payatakes and coworkers [Payatakes and Tien, J. Aerosol Sci., 7, 85 (1976) Payatakes, Am. Inst. Chem. Eng. J., 23,192 (1977) and Payatakes and Gradon, Chem. Eng. Sci., 35,1083 (1980)] have attempted to model the growth of dendrites and its influence on filter efficiency and pressure drop. 

Hanley JT, Ensor DS, Smith DD et al (1994) Fractional aerosol filtration efficiency of in-duct ventilation air cleaners. IndoOT Air 4 169-178 Hinds WC (1999) Aerosol technology. Wiley, New York... 

Gibson, P. and Gibson, H. S. Use of Electrospun Nanofibers for Aerosol Filtration in Textile Structures, Proceeding of 24th Army Science Conference (ASC2004) Orland, FL, (20 Novem-ber-December, 2004). 

Researchers have reported some properties of electrospun mats. They compared the performances of electrospun fibre mats with the properties of textiles and membranes currently used in protective clothing systems and showed that electrospun layers are extremely efficient for trapping airborne particles. Meanwhile, the air flow resistance and aerosol filtration properties are affected by the coating weight. It was shown that an extremely thin layer of electrospun nanofibres completely prevented particle penetration through the layer. 

Zhong W and Pan N (2007), Aerosol filtration by fibrous filters A statistical mechanics approach . Text Res J, 77(5), 284-289. 

Most filtration processes used in large-scale biotechnology should not have the potential to generate microbial aerosols. Filtration columns normally use gravitational forces to separate products from impurities and so are low energy processes. The only potential problem can come in either rotary vacuum filtration or with filter presses if a violent method of biomass removal from the filter is used. Wickramanayake has reported that it is often the practice with filter presses to knock the cell mat of the filter with hammers. This practice has been shown to generate microbial aerosols. 

The technical portion of the NOSH Consortium filtration study focused on three areas where current aerosol filtration methods and instrumentation can be explored, including (1) isolating and quantifying particle losses due solely to aerosol particle interactions with filter media, (2) measuring the... 

Another difficulty experienced when using the sparging method is the possibility of unintended aerosol production and transport with the vapor. Expedient measures can be implemented to remove aerosols from the product stream, including aerosol filtration and maintaining the sparger at subambient temperature however, this phenomenon reduces the operator s ability to establish predictable concentration with the generator s operating conditions. 

The potential of discussed approaches for high oi7-repellence of technical fabrics made of PET and its impact in the field of aerosol filtration was evaluated in a recent study by the authors [49]. The objective of this study was to assess the performance of technical fabrics as drainage media in compressed air filters. Drainage layers are designed to take up the oil from... 

NORM Eurovent DIN 24185 DIN DIN Test aerosol Filtration grade lEC Average transmittance grade Test aerosol BIA Test aerosol Average transmittance grade... 

Krish AA, Stechkina IB. The theory of aerosol filtration with fibrous filters. In Shaw DT, editor. Fundamentals of aerosol science. Wiley 1978. 

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