Environmental Engineering Reference
In-Depth Information
17
Filtration and Sampling of
Aerosols by Fibrous Filters
A.K. Budyka, A.A. Kirsch, and B.I. Ogorodnikov
CONTENTS
17.1 Introduction........................................................................................................................ 439
17.2 Filtering Characteristics of Fibrous Filters ........................................................................ 441
17.3 Aerosol Particle Capture Mechanisms in Fibrous Filters .................................................. 442
17.4 Modeling Filtration Processes ...........................................................................................444
17.4.1 Hydrodynamic Resistance of Parallel Fiber Model Filters ....................................444
17.4.2 Difusive Deposition of Particles in Model Filters................................................. 447
17.4.3 Model Filters of Ultraine Fibers............................................................................ 449
17.4.4 Particles of the Most Penetrating Size for Nanoibrous Filters .............................. 450
17.4.5 Fan-Type Modeling Filter....................................................................................... 452
17.5 Method of Calculation of Particle Deposition Eficiency in Real Filtering Materials ...... 454
17.6 On Testing Submicron and Nanoiber Filters with Nanoparticles..................................... 455
17.7 Nonstationary Filtration and Optimization Problems ....................................................... 456
17.8 Analytical Filtration........................................................................................................... 456
17.9 Rebound of Particles .......................................................................................................... 458
17.10 Fibrous Filtering Materials of FP Type .............................................................................460
17.11 Using Fibrous Filters for Determination of Particle Size Distribution .............................. 461
17.11.1 Size Range ...........................................................................................................464
17.11.2 Sampling ..............................................................................................................464
17.11.3 Comparison with the Impactor ............................................................................464
17.11.4 MFM Application ................................................................................................ 465
17.12 Filters for Capturing Gaseous Substances ......................................................................... 465
17.12.1 Correction for Volatile Substances Desorption ...................................................466
17.13 Composition of Filtering Materials for Atmospheric Monitoring ..................................... 467
17.14 Conclusion.......................................................................................................................... 467
Acknowledgment ........................................................................................................................... 468
References...................................................................................................................................... 468
17.1 INTRODUCTION
Air and gas puriication from submicron particles is one of the prime components of modern
technologies applied in high-precision mechanics, electronics, medicine, nanotechnologies, high-
purity materials obtaining, etc. High requirements to air quality are declared for production
departments where radioactive agents and different origin hazardous aerosols containing toxic
chemical compounds are being generated. Therefore, adequate means of personal respiratory system
protection against such aerosols as well as against bioaerosols containing viruses and bacteria are
essential.
439
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