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Articles
  • Effect of the layer arrangement of meltblown depth filter media for collection of nanoparticles   [CET 2015]
  • Author(s)
  • Kang-San Lee
  • ABSTRACT
  • Airborne nanoparticles are sometimes reffered to as nanoaerosols and ultrafine particulate matters. Nanoaerosols comprise over 95% of particle matters when the particle number distribution is considered. As the concentrations of airborne nanoparticles increase with the development of nanotechnology and other sources, the special properties of nanoparticles give rise to recent concerns about the potential health hazards posed to workers or users that are exposed to them. Nanoparticles can cause adverse health effects due to they can readily enter the human body and their toxicity is relatively high because of the large specific surface area. Therefore, the filtration of nanoparticles is becoming an important issue. Filtration is the simplest and most common method for air pollution control, emission reduction. Based on classical filtration theory, the collection efficiency for nanoparticles is significantly high due to higher levels of Brownian diffusion. This paper presents experimental results and theoretical analysis of nanoparticle penetration through meltblown depth filter media using KCl nanoparticles. The effect of the filter media thickness and the media layer arrangement was evaluated by performing the tests with laboratory scale test unit. As a result, the meltblown multi-layer depth filter media fractional collection efficiency of nanoparticles are in good agreement with predicted filtration theory by Lee. To ignore electric force, uncharged filter prepared by discharging the charged filters by isopropyl alcohol treatment were used as test filters. The results shows that multi layer melt-blown filter meda has a high collection efficiency of nanoparticles and low pressure drop. Further tests will be performed to evaluate the performance of the pleated meltblown multi-layer depth filter elements for application of hospital heating ventilating and air conditioning(HAVAC) system.
  • KEYWORDS
  • layer arrangement, meltblown depth filter media, collection of nanoparticles
  • References

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