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Atmosphere
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Advances in Understanding Aerosols Filtration
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Advances in Understanding Aerosols Filtration

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Air Pollution Control".

Deadline for manuscript submissions: closed (10 August 2022) | Viewed by 9193

Special Issue Editor

Dr. Soleiman Bourrous

E-Mail Website
Guest Editor
SCA, Inst Radioprotect & Surete Nucl IRSN, PSN RES, F-91192 Gif Sur Yvette, France
Interests: aerosol filtration; aerosol physic and metrology

Special Issue Information

Dear Colleagues,

Over the last century, the effect of the air quality on human activities has been demonstrated beyond any doubt. Airborne contaminant impacts machinery lifetime, human health, and many aspect of everyday life. The current pandemic is, therefore, a relevant illustration. To avoid unwanted effects induced by poor air quality, filtration technologies are widely used and continuously improved. The need for reliable and efficient technologies is a real issue for a very wide range of uses, from general high flowrate ventilation systems to personal protective devices or small electronic cooling.

The progress of numerical simulation and instrumentation technics allows us to continuously improve our understanding of the physical phenomenon and to model them. The behavior of classical filters in terms of airflow resistance, collection efficiency, and potential failures in specific working conditions is more and more accurately predicted.  The design of filters is improved through the use of nanofibrers, electrostatic effects, improved  pleat geometries, or advanced medium design. New filtration concepts based on aerosol and gas physicochemical properties are developed to overcome imitation of existing technologies.

This Special Issue aims to gather original works, new approaches, and scientific reviews on air filtration-related topics. Experimental, numerical, and original approaches to design, understand, or improve current knowledges on this thematic are welcome.

Dr. Soleiman Bourrous
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atmosphere is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fibrous medium
  • pleated filter
  • clogging
  • porous media
  • nanofibers
  • inertial collector
  • electrostatic filters

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Published Papers (4 papers)

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Research

19 pages, 4511 KiB  
Article
Stabilized Electrospun Polyacrylonitrile Fibers for Advancements in Clean Air Technology
by Ivan P. Beckman, Gentry Berry, Mine Ucak-Astarlioglu, Travis L. Thornell, Heejin Cho and Guillermo Riveros
Atmosphere 2023, 14(3), 573; https://doi.org/10.3390/atmos14030573 - 16 Mar 2023
Cited by 3 | Viewed by 2715
Abstract
Particulate matter air pollution and volatile organic compounds released into the air from the incomplete combustion of fossil fuels and wildfires creates significant damage to human health and the environment. Advances in air filtration and purification technology are needed to mitigate aerosol hazards. [...] Read more.
Particulate matter air pollution and volatile organic compounds released into the air from the incomplete combustion of fossil fuels and wildfires creates significant damage to human health and the environment. Advances in air filtration and purification technology are needed to mitigate aerosol hazards. This article details an effort to explore the potential benefits of new materials and methods for the production of nonwoven air filtration media through electrospinning and stabilizing polyacrylonitrile fibers. The investigated production methods include electrospinning fibrous matting onto a stainless steel wire mesh and stabilizing the nonwoven media in a chamber furnace. The media is then tested for air filtration penetration and airflow resistance, and the fiber size distribution is measured using scanning electron microscopy. The experimental results show that the electrospun media approaches the performance criteria for airflow resistance and particle capture efficiency of high-efficiency particulate air (HEPA) filter media. Furthermore, performance estimations for electrospun media of increased thickness and for a decreased filtration velocity show potential to exceed the HEPA media resistance and efficiency criteria. Thus, it is suggested that electrospun and stabilized nonwoven fibrous media are candidates as alternatives to traditionally manufactured HEPA media and may potentially benefit modern air filtration technology and reduce hazards associated with particulate matter. Additionally, the authors recommend future exploration into the carbonization and activation of electrospun filter media for the adsorption and mitigation of volatile organic compounds as a secondary benefit, while maintaining high efficiency and low airflow resistance in the removal of particulate matter from aerosol streams. Full article
(This article belongs to the Special Issue Advances in Understanding Aerosols Filtration)
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11 pages, 2538 KiB  
Article
Numerical Simulation of a CAM-Measured Spectra Influenced by Coarse Aerosol
by Grégoire Dougniaux, William Soerjady, Kelvin Ankrah and Diane Mauclère
Atmosphere 2022, 13(12), 2113; https://doi.org/10.3390/atmos13122113 - 16 Dec 2022
Viewed by 1966
Abstract
In nuclear facilities, the mandatory atmosphere surveillance is operated by Continuous Air Monitors. This standalone instrument is designed to measure the airborne aerosol activity concentration and to trig an alarm signal when a predetermined activity concentration is exceeded. However, a rapid resuspension event [...] Read more.
In nuclear facilities, the mandatory atmosphere surveillance is operated by Continuous Air Monitors. This standalone instrument is designed to measure the airborne aerosol activity concentration and to trig an alarm signal when a predetermined activity concentration is exceeded. However, a rapid resuspension event of coarse aerosol leads to a measurement error: the airborne aerosol activity concentration is over-evaluated. Prior results have shown that the coarse aerosol deposit disturbs the background evaluation for the radioactivity measurement. The interactions between radioactive aerosols (with radon daughters) and coarse non-radioactive aerosols have to be investigated by running together aerosol models and nuclear simulations. Therefore, this paper investigates different ways to represent an aerosol deposit in numerical simulations. We developed two numerical aerosol deposit models that we integrated into Geant4, a tool for the simulation of the passage of radiations through matter, and then compared these to experimental results. The simplest model was discarded, and by using the second model, we managed to correctly frame our simulation results as an experimental measurement: an aerosol has been correctly considered in a nuclear simulation. By combining theory, simulations, and experimentations on both aerosol science and nuclear physics, this research will be able to improve the comprehension of monitors’ behaviour in delicate situations and, more broadly, the filtration of aerosols using radioactivity. Full article
(This article belongs to the Special Issue Advances in Understanding Aerosols Filtration)
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16 pages, 3725 KiB  
Article
Precoating Effects in Fine Steelmaking Dust Filtration
by Bárbara K. S. A. Andrade, Rafael Sartim and Mônica L. Aguiar
Atmosphere 2022, 13(10), 1669; https://doi.org/10.3390/atmos13101669 - 13 Oct 2022
Cited by 4 | Viewed by 2208
Abstract
Particle emissions into the atmosphere can cause extensive damage to the environment and human health. To improve the efficiency in the collection of submicronic particles, new filtration media appeared on the market due to new textile technologies and equipment, such as filter media [...] Read more.
Particle emissions into the atmosphere can cause extensive damage to the environment and human health. To improve the efficiency in the collection of submicronic particles, new filtration media appeared on the market due to new textile technologies and equipment, such as filter media developed with polytetrafluoroethylene (PTFE) membranes; however, these are more expensive. A filter coating technique called precoating is a more economical alternative that could enhance filtration efficiency. This paper aimed to evaluate the operational parameters of precoating for micro- and nanoparticle filtration and compare the results with those obtained from the PTFE membrane. For this purpose, filtration cycles were performed, using precoated polyester with hydrated lime and dolomitic limestone, polyester with a PTFE membrane, and steel industry ultrafine dust. The results showed that the precoated polyester had a longer cycle duration and lower pressure drop than the polyester with a PTFE membrane. Therefore, precoating was shown to be a great alternative to be used in bag filters in steel mills because it presented high collection efficiency for submicronic particles, in addition to increasing the bag lifespan with less energy expenditure. Full article
(This article belongs to the Special Issue Advances in Understanding Aerosols Filtration)
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Graphical abstract

17 pages, 5217 KiB  
Article
Investigation of the Possibility of Application of Metal Fibrous Media in the Process of Filtration of Liquid Aerosols
by Marie Lecoq, Soleiman Bourrous, Dominique Thomas, Jean-Christophe Appert-Collin, Fabien Floc’Hlay and Mathieu Barrault
Atmosphere 2022, 13(10), 1633; https://doi.org/10.3390/atmos13101633 - 7 Oct 2022
Cited by 2 | Viewed by 1446
Abstract
This manuscript presents a study of the possibility of applying metallic fibre filter media made of stainless steel for the filtration process of liquid aerosols. To perform the experiment, three types of filters were used: single layer and symmetric or non-symmetric multi-layered filters. [...] Read more.
This manuscript presents a study of the possibility of applying metallic fibre filter media made of stainless steel for the filtration process of liquid aerosols. To perform the experiment, three types of filters were used: single layer and symmetric or non-symmetric multi-layered filters. Filters have been loaded with DEHS (Di-Ethyl-Hexyl-Sebacate) aerosol while the pressure drop and the collection efficiency were monitored. The impact of the filtration velocity on the saturation pressure drop has been quantified for monolayer filters. The building of a draining film on the free surface of the multi-layered filters has been studied and the impact of this phenomenon on the filtration performances and saturation ratio of the medium are discussed. For multilayer filters, the clogging dynamic, occurring by a successive loading of the draining layers, is highlighted in this work. Finally, propositions are made to evaluate the behaviour of metallic multi-layered filters for liquid aerosol filtration applications. Full article
(This article belongs to the Special Issue Advances in Understanding Aerosols Filtration)
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