Air ionization as a control technology for off-gas emissions of volatile organic compounds

Kim, Ki‐Hyun; Szulejko, Jan E.; Kumar, Pawan; Kwon, Eilhann E.; Adelodun, Adedeji A.; Reddy, Police Anil Kumar

doi:10.1016/j.envpol.2017.03.026

Cited by 50 publications

(13 citation statements)

References 92 publications

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“…Ionizers are easy to deploy and have high energy efficiency but have not been evidenced as effective devices against viruses including SARS-CoV-2. Some devices are known to produce by-products such as ozone so their effect on air quality should also be considered [99,110]. A recent study concluded that associated by-products other than ozone can also adversely affect the respiratory and cardiovascular systems [111].…”

Section: Other Mitigating Measuresmentioning

confidence: 99%

The ventilation of buildings and other mitigating measures for COVID-19: a focus on wintertime

et al. 2021

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Section: Other Mitigating Measuresmentioning

confidence: 99%

The ventilation of buildings and other mitigating measures for COVID-19: a focus on wintertime

et al. 2021

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“…The efficiency in the destruction of VOCs depends on the ion density, the treatment time, and the chemical structure of the VOCs [23]. The most widely used method for the generation of ions in the air is by thermal plasma reactors [24]. Ozone is a powerful oxidant.…”

Section: Air Purification Of Interiormentioning

confidence: 99%

Microchannel filter for air purification

2020

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AbstractIn this study, we propose a new design for a microchannel filter. The closed indoor environments with which we interact daily are sources of diseases for the respiratory system of human beings. Recommendations for the design of microchannel filters for indoor air purification are proposed, implementing low-cost microequipment technology (MET) for the manufacture of the elements that constitute a microfiltration system. For the microchannel filter production, we proposed to use MET, which is a miniaturization technology and can reduce manufacturing costs. The microchannel filter was 3.75 cm in radius with a thickness of 3 mm. It had a triangular profile and a helical trajectory. It was designed, manufactured, and tested for two profile dimensions. The main purpose was to reduce the pressure drop of the air flow through the filter. We described the air flow simulation for the microchannel filter using SolidWorks. A prototype microchannel filter was constructed, which underwent manufacturing tests. It is possible to clean the microchannel using water flow, which allows us to maintain the filtration quality within an optimum range of contaminant removal.

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“…These are often marketed as a way to eliminate virus-containing particles from indoor air (given the ongoing COVID-19 pandemic), with VOC removal presented as an added benefit to PM reduction or virus inactivation. However, the oxidative removal of VOCs (using techniques such as photocatalytic oxidation or ionization − ) runs the risk of generating harmful oxidation byproducts, ,,,, such as ozone or oxidized organic compounds. Moreover, most manufacturers do not provide data on VOC removal rates; the limited previous study of oxidation-based, consumer-grade air cleaners has found their efficacy to be widely variable .…”

Section: Introductionmentioning

confidence: 99%

Real-Time Laboratory Measurements of VOC Emissions, Removal Rates, and Byproduct Formation from Consumer-Grade Oxidation-Based Air Cleaners

Krechmer

Shutter

et al. 2021

Environ. Sci. Technol. Lett.

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Levels of volatile organic compounds (VOCs) in the indoor environment can be decreased by the use of "air cleaners", devices that remove VOCs by sorption and/or oxidative degradation. However, efficacies of these technologies for removing VOCs tend to be poorly constrained, as does the formation of oxidation byproducts. Here, we examine the influence of several oxidation-based air cleaners, specifically ones marketed as consumer-grade products, on the amounts and composition of VOCs. Experiments were conducted in an environmental chamber, with a suite of real-time analytical instruments to measure direct emissions, VOC removal efficacies (by the addition of either limonene and toluene), and byproduct formation. We find that the air cleaners themselves can be a source of organic gases, that removal efficacy can be exceedingly variable, and that VOC loss is primarily driven by physical removal in some cleaners. When oxidative degradation of VOCs was observed, it was accompanied by the formation of a range of oxidation byproducts, including formaldehyde and other oxygenates. These results indicate that some consumer-grade portable air cleaners can be ineffective in removing VOCs and that the air delivered may contain a range of organic compounds, due to direct emission and/or byproduct formation.

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Air ionization as a control technology for off-gas emissions of volatile organic compounds

Cited by 50 publications

References 92 publications

The ventilation of buildings and other mitigating measures for COVID-19: a focus on wintertime

The ventilation of buildings and other mitigating measures for COVID-19: a focus on wintertime

Microchannel filter for air purification

Real-Time Laboratory Measurements of VOC Emissions, Removal Rates, and Byproduct Formation from Consumer-Grade Oxidation-Based Air Cleaners

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