A New Method of Removing Fine Particulates Using an Electrostatic Force

Heo, Jaeseok; Jang, Yelim; Versoza, Michael; Kim, Gihwan; Park, Duckshin

doi:10.3390/ijerph18126199

Cited by 5 publications

(13 citation statements)

References 29 publications

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“…The potential value of LA-NFs was found to be relatively maximum (71 V), ultimately yielding the highest percentage of removal efficiency and vice versa. The findings are consistent with the study of Heo et al that electrostatic force generated by electrostatic charges can improve the filter’s PM removal efficiency.…”

Section: Resultssupporting

confidence: 93%

Effect of Different Symmetries of Electrospun Poly(lactic acid) Nanofibers on Facemask Filtration

Kashif

Han

et al. 2023

ACS Appl. Polym. Mater.

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The Covid-19 pandemic has prompted the use of disposable facemasks, which has raised serious environmental concerns. Thus, we developed ultrafine electrospun masks comprising eco-friendly and biodegradable polymer polylactic acid, spun with different degrees of fiber alignments, ranging from random to less, medium, and highly aligned nanofibers. The filtration performance was assessed by penetrating sodium chloride (NaCl) aerosol particles (mean diameter 0.25 μm). The LA-NF samples exhibited a homogeneous network of fibers and thus even pore size distribution. The homogeneity of flow is generally accompanied by a decreased value of pressure drop. Such flow through the gaps (pores) created between the fibers follows Bernoulli’s principle, which revealed an extremely decreased value of pressure drop of 96 Pa and yielded a high filtration efficiency of 99.998% and a Q f of 0.17 Pa–1. The presence of static charges on membranes varies according to the geometry of the surface, which provides a strong electrostatic force between fine particulates and the charged surface. Moreover, a comparative study of static chargeability of the less aligned sample and conventional polypropylene filter was conducted, which revealed mean potential values of 67.1 and 60.8 V, respectively. The outcome implies the superior characteristics of the former, which can be attributed to the surface geometry of the structured membrane.

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Section: Resultssupporting

confidence: 93%

Effect of Different Symmetries of Electrospun Poly(lactic acid) Nanofibers on Facemask Filtration

Kashif

Han

et al. 2023

ACS Appl. Polym. Mater.

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“…Particulate matter is harmful to human health [1][2][3][4][5][6]. Vehicles are a representative source of particulate matter in urban areas [3,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Vehicles are a representative source of particulate matter in urban areas [3,7,8]. Internal combustion engines in vehicles emit various pollutants, including particulate matter, sulfur oxides, nitrates, and ozone [6,7]. The particulate matter generated by internal combustion engines can lead to cardiovascular contraction, causing hypertension and heart disease [6,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Internal combustion engines in vehicles emit various pollutants, including particulate matter, sulfur oxides, nitrates, and ozone [6,7]. The particulate matter generated by internal combustion engines can lead to cardiovascular contraction, causing hypertension and heart disease [6,9,10]. Studies have shown that high, continuous exposure to particulate matter is associated with an increased relative risk of daily cardiovascular disease mortality [6,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Removal of Particulate Matter by a Non-Powered Brush Filter Using Electrostatic Forces

Heo,

Lee,

Yoon

et al. 2023

Toxics

Self Cite

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In urban areas, a major source of harmful particulate matter is generated by vehicles. In particular, bus stops, where people often stay for public transportation, generate high concentrations of particulate matter compared to the general atmosphere. In this study, a non-powered type brush filter that generates electrostatic force without using a separate power source was developed to manage the concentration of particulate matter exposed at bus stops, and the removal performance of particulate matter was evaluated. The dust collection performance of the non-motorized brush filter varied by material, with particle removal efficiencies of 82.1 ± 3.4, 76.1 ± 4.7, and 73.7 ± 4.5% for horse hair, nylon, and stainless steel, respectively. In conditions without the fan running to see the effect of airflow, the particle removal efficiency was relatively low at 58.2 ± 8.4, 53.6 ± 9.2, and 58.0 ± 7.3%. Then, to check the dust collection performance according to the density, the number of brushes was increased to densify the density, and the horse hair, nylon, and stainless steel brush filters showed a maximum dust collection performance of 89.6 ± 2.2, 88.3 ± 3.2, and 82.1 ± 3.8%, respectively. To determine the replacement cycle of the non-powered brush filter, the particulate removal performance was initially 88.0 ± 3.2% when five horse hair brushes were used. Over time, particulate matter tended to gradually decrease, but after a period of time, particulate matter tended to increase again. The purpose of this study is to evaluate the particulate matter removal performance using a brush filter that generates electrostatic force without a separate power source. This study’s brush filter is expected to solve the maintenance problems caused by the purchase and frequent replacement of expensive HEPA filters that occur with existing abatement devices, and the ozone problems caused by abatement devices that use high voltages.

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“…Research pertaining to the electrical dust collection method has mainly been conducted with the goal of generating an artificial electrostatic force by applying a high voltage using a corona discharge charging system before and after the filter [ 11 , 12 ]. However, the corona discharge used in the operation of the electrostatic precipitator may result in a gas that is harmful to the human body at high concentrations, such as the ozone generated in the process of charging particles, which may irritate the respiratory tract [ 12 , 13 , 14 , 15 , 16 ]. Accordingly, the Ministry of Environment recommended that the indoor ozone concentration in multi-use facilities, such as underground stations and waiting rooms, should be maintained below 0.06 ppm as of 2017.…”

Section: Introductionmentioning

confidence: 99%

Effects of Brush-Type Ionizer Materials on Virus Inactivation

Heo

Lee

Park

2022

Toxics

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Many studies have found that bioaerosols are harmful to humans. In particular, infectious viruses, such as the virus that causes COVID-19, are increasing. Therefore, the research on methods for reducing bioaerosols is becoming progressively more important. The purpose of this study was to improve the existing electrostatic precipitator, which generates high concentrations of ozone, by reducing bioaerosols effectively without significant ozone production. A brush-type ionizer was studied as a replacement for the existing electrostatic precipitator. The study, which was conducted at the laboratory scale, determined the amounts of ions generated with different ionizer materials (carbon, copper, and stainless steel) and voltages (−1, −2, and −3 kV), as well as it compared the virus inactivation efficiency under the various conditions. As a result, about two million ions were produced when a voltage of −3 kV was applied to all of the materials, and 99.9 ± 0.2% and 98.8 ± 0.6% virus inactivation efficiencies were confirmed in the cases of carbon and copper, respectively. In addition, an assessment of the effect of flow velocity confirmed that the inactivation efficiency decreased as the flow velocity increased. However, the results for the flow velocities of 0.2 and 0.4 m/s had similar trends. Therefore, this system can be used with flow velocities up to 0.4 m/s.

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A New Method of Removing Fine Particulates Using an Electrostatic Force

Cited by 5 publications

References 29 publications

Effect of Different Symmetries of Electrospun Poly(lactic acid) Nanofibers on Facemask Filtration

Effect of Different Symmetries of Electrospun Poly(lactic acid) Nanofibers on Facemask Filtration

Removal of Particulate Matter by a Non-Powered Brush Filter Using Electrostatic Forces

Effects of Brush-Type Ionizer Materials on Virus Inactivation

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