Effect of Negative Air Ions on Fog and Smoke

Sawant, V. S.; Meena, G. S.; Jadhav, D. B.

doi:10.4209/aaqr.2011.11.0214

Cited by 35 publications

(30 citation statements)

References 31 publications

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“…in the air as well as on the inanimate surfaces was also reported in that study. Other successful applications of air ionizers have also been reported for particle control in closed environment (Shiue et al, 2011;Sawant et al, 2012). In this study, though the efficient air ventilation that homogenize the air quality in the ICU may explain the lack of noticeable microbial concentration differences on the two sides of the air purifiers, one may still argue that the local air purifiers do not work well in open-space ICU.…”

Section: Effects Of Patient Visitation Activities and Local Air Purifmentioning

confidence: 48%

Airborne and Surface-Bound Microbial Contamination in Two Intensive Care Units of a Medical Center in Central Taiwan

Huang

Shi

Chen

et al. 2013

Aerosol Air Qual. Res.

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Samples of airborne and surface-bound microbial contamination were taken in two intensive care units of a large-scale medical center. Microbial analyses included total bacterial and fungal loads, as well as the four bacterial species of Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Acinetobacter baumannii. Among the 114 surface samples taken from seven designated surface locations of room and equipment for each patient, P. aeruginosa was the most frequently detected (19.3%) and most abundant (mean count: 4.18 cfu/plate) bacterium, whereas the respirator represented the most heavily contaminated surface location in both total pathogenic bacteria colony counts (272 cfu) and frequency of positive detection (38.2%). P. aeruginosa also represented the most frequently detected (39.1%, n = 46) and abundant (11.52 ± 17.16 cfu/m 3 ) bacterium in the air samples (n = 46), and was the only bacterium exhibiting a positive correlation of the mean counts between air and surface samples. The data analysis results further suggested a higher value of relative risk among the infected patients in the presence of the pathogens as compared to those in the absence of them, although the evidence of a of correlation for the individual bacterial species between the environmental samples and infected patients was inconclusive. This study also found that the mean airborne counts and the detection frequencies of these bacteria after patient visitation periods were higher than those before visitation, and that the installation of local air ionizers did not lead to any discernible differences in total bacterial and fungal concentrations.

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Section: Effects Of Patient Visitation Activities and Local Air Purifmentioning

confidence: 48%

Airborne and Surface-Bound Microbial Contamination in Two Intensive Care Units of a Medical Center in Central Taiwan

Huang

Shi

Chen

et al. 2013

Aerosol Air Qual. Res.

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“…PM concentration was reduced by up to two orders of magnitude after 2 hours of treatment by NAI generator in an unoccupied office room (50 m 3 ) [ 144 ]. Many other similar reports showed the high efficiency of NAIs in PM removal ( Table 3 ; [ 138 , 140 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 ]). Evidence showed that many factors might affect PM reducing efficiency by NAIs ( Table 3 ; [ 34 , 139 , 150 , 153 ]).…”

Section: The Release Of Negative Air Ions As An Efficient Way To Rmentioning

confidence: 72%

Negative Air Ions and Their Effects on Human Health and Air Quality Improvement

Jiang

Ramachandran

2018

IJMS

144

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Negative air ions (NAIs) have been discovered for more than 100 years and are widely used for air cleaning. Here, we have carried out a comprehensive reviewing on the effects of NAIs on humans/animals, and microorganisms, and plant development. The presence of NAIs is credited for increasing psychological health, productivity, and overall well-being but without consistent or reliable evidence in therapeutic effects and with controversy in anti-microorganisms. Reports also showed that NAIs could help people in relieving symptoms of allergies to dust, mold spores, and other allergens. Particulate matter (PM) is a major air pollutant that affects human health. Experimental data showed that NAIs could be used to high-efficiently remove PM. Finally, we have reviewed the plant-based NAI release system under the pulsed electric field (PEF) stimulation. This is a new NAI generation system which releases a huge amount of NAIs under the PEF treatment. The system may be used to freshen indoor air and reduce PM concentration in addition to enriching oxygen content and indoor decoration at home, school, hospital, airport, and other indoor areas.

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“…Under similar conditions of the electric circuit the loss of the positive corona is greater than that of the negative corona at the same applied voltage. Because the negative corona curve is flatter and since larger negative corona currents can be obtained, the negative corona is much better adapted for applications such as fog elimination and electrical precipitation than the positive corona (Sawant et al, 2012;Strong, 1913) The wire electrode is a low-cost and high-efficiency plasma source configuration, especially for the large-scale corona discharge system. For a wire electrode radius within the range of 100 to 1000 µm, the plasma thickness increases with increasing wire radius.…”

Section: Corona Discharge Installation and Ion Measurementsmentioning

confidence: 99%

Large-scale ion generation for precipitation of atmospheric aerosols

et al. 2020

Atmos. Chem. Phys.

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Abstract. Artificial rain is explored as a remedy for climate change caused farmland drought and bushfires. Increasing the ion density in the open air is an efficient way to generate charged nuclei from atmospheric aerosols and induce precipitation or eliminate fog. Here we report on the development of a large commercial-installation-scale atmospheric ion generator based on corona plasma discharges, experimental monitoring, and numerical modeling of the parameters and range of the atmospheric ions, as well as the application of the generated ions to produce charged aerosols and induce precipitation at the scale of a large cloud chamber. The coverage area of the ions generated by the large corona discharge installation with the 7.2 km long wire electrode and applied voltage of −90 kV is studied under prevailing weather conditions including wind direction and speed. By synergizing over 300 000 localized corona discharge points, we demonstrate a substantial decrease in the decay of ions compared to a single corona discharge point in the open air, leading to large-scale (30 m ×23 m ×90 m) ion coverage. Once aerosols combine with the generated ions, charged nuclei are produced. Higher wind speed has led to larger areas covered by the plasma-generated ions. The cloud chamber experiments (relative humidity 130±10 %) suggest that charged aerosols generated by ions with a density of ∼104 cm−3 can accelerate the settlement of moisture by 38 %. These results are promising for the development of large-scale installations for the effective localized control of atmospheric phenomena.

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Effect of Negative Air Ions on Fog and Smoke

Cited by 35 publications

References 31 publications

Airborne and Surface-Bound Microbial Contamination in Two Intensive Care Units of a Medical Center in Central Taiwan

Airborne and Surface-Bound Microbial Contamination in Two Intensive Care Units of a Medical Center in Central Taiwan

Negative Air Ions and Their Effects on Human Health and Air Quality Improvement

Large-scale ion generation for precipitation of atmospheric aerosols

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