One-pass antibacterial efficacy of bipolar air ions against aerosolized Staphylococcus epidermidis in a duct flow

Lee, Sang Gu; Hyun, Junho; Lee, Sung Hwa; Hwang, Jungho

doi:10.1016/j.jaerosci.2013.12.005

Cited by 29 publications

(26 citation statements)

References 35 publications

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“…Inactivation of bacteria leads to harmless substances that pose no threat to humans. Air ions could be a potential approach, but such a method has not been studied systematically, even though the effect of negative ions on microorganisms has long been controversially disputed in many research areas [9,30]. In this study, the distribution of negative ions and their effects on bacteria were numerically and experimentally investigated in ventilation ductwork.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…They showed that it is feasible to remove bioaerosols with a low-efficiency HVAC filter enhanced by continuous emission of unipolar air ions. Lee et al [7][8][9] conducted similar experiments to determine the disinfection performance of air ions against aerosolized bacteria. Unipolar and bipolar ionizers were installed in a duct flow to evaluate the disinfection efficacy with different numbers of ionizers and the polarity effect.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the accuracy of the modeling could not be validated experimentally. Moreover, many studies used negative ionizers in very small tubes or at low velocities [9]. The results therefore may not be applicable for practical ventilation systems.…”

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confidence: 99%

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Numerical and experimental study on airborne disinfection by negative ions in air duct flow

Zhou

Yang

Huang

et al. 2018

Building and Environment

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In this paper, we develop a mathematical model that aims (1) to predict the distribution of negative ions generated by an air ionizer installed in a ventilation duct and (2) to predict the efficiency with which it inactivates bacteria. The transportation equation for the negative ions was resolved combined with the bulk air velocity and the electric field.The bacteria distribution was solved numerically by integrating the susceptibility constant, which was acquired from the experiments. Two types of bacteria (Serratia marcescens, Staphylococcus epidermidis) were aerosolized and released into a 9-m ventilation duct system. Inactivation efficiencies were calculated for inlet velocities from 2 to 6.5 m/s and for various ion intensities. The efficiencies for S. marcescens and S. epidermidis were 31.53% (SD, 11.4%) and 12.17% (SD, 0.43%), respectively, with susceptibility constants of 8.67 × 10 −11 Colony-Forming Units (CFU)/ions and 2.72 × 10 −11 CFU/ions, respectively. The modeling results matched those of the experiments well. The pressure penalty at the maximum velocity (6.5 m/s) was only 9 Pa. The results show that the use of negative ions has great potential to enhance indoor air quality by reducing airborne microorganisms in ventilation systems.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study on airborne disinfection by negative ions in air duct flow

Zhou

Yang

Huang

et al. 2018

Building and Environment

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show abstract

“…The basic metabolic activities of bacteria depend on their membrane potential; thus, drastic changes of the membrane potential and local electrical field induced by imposed charges could affect cell viability, causing their inactivation or death depending on their sensitivity (Fletcher et al, 2007;Kim et al, 2011;Lee et al, 2014;Mainelis et al, 2002aMainelis et al, , 2002b. The mechanism responsible for the bactericidal effect of both negative and positive ions has not yet been fully established.…”

Section: Need For and Feasibility Of Neutralization Of Generated Bactmentioning

confidence: 99%

“…Once the charge state of particles has reached equilibrium, the aerosol shows a bipolar distribution described by the Boltzmann equation (Flagan, 2011). In the case of airborne microorganisms, high positive and negative electrical charges present on their membranes have been shown to affect the culturability or viability of sensitive organisms through physical or chemical processes (Fletcher et al, 2007;Kim et al, 2011;Lee, Hyun, Hwa Lee, & Hwang, 2014;Mainelis et al, 2002aMainelis et al, , 2002b.…”

Section: Introductionmentioning

confidence: 99%