Aerobiological, ecological, and health linkages

Main, C. E.

doi:10.1016/s0160-4120(03)00012-6

Cited by 35 publications

(23 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Airborne pathogens from indoor coughing and sneezing may spread to other indoor spaces through air‐conditioning return air ducts. People who are known to be exposed to airborne pathogens from HVAC systems have developed a wide range of health problems including infectious, allergenic, or toxigenic diseases …”

Section: Introductionmentioning

confidence: 99%

Disinfection efficacy of ultraviolet germicidal irradiation on airborne bacteria in ventilation ducts

et al. 2018

View full text Add to dashboard Cite

A full-scale ventilation duct ultraviolet germicidal irradiation (in-duct UVGI) system was designed to investigate its disinfection efficacy on five airborne pathogens: Serratia marcescens, Pseudomonas alcaligenes, Escherichia coli, Salmonella enterica, and Staphylococcus epidermidis, with airflow Reynolds numbers from 4 × 10 to 8 × 10 . By varying the UV intensity, the susceptibility constants (Z-values) of the bacteria were experimentally determined to be 1.2, 1.0, 0.60, 0.39, and 0.37 m /J for S. marcescens, P. alcaligenes, E. coli, S. enterica, and S. epidermidis, respectively. The disinfection efficacy was numerically investigated on the basis of the predicted irradiance, which included emissive irradiance and diffuse refection irradiance. The results suggest that it is vital to properly evaluate the UV dose (irradiance intensity) received by airborne bacteria to determine their Z-values. In-duct UVGI inactivated nearly all of the test bacteria with Reynolds numbers of 4 × 10 (inlet velocity = 3 m/s), and the disinfection efficacy decreased as Reynolds numbers increased. The in-duct UVGI system would potentially provide a supplementary solution for improving indoor air quality (IAQ) within mechanical ventilated/air-conditioned environment.

show abstract

Section: Introductionmentioning

confidence: 99%

Disinfection efficacy of ultraviolet germicidal irradiation on airborne bacteria in ventilation ducts

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Bioaerosols, such as airborne bacteria, viruses, fungi, and biological fragments, can flow freely with airflow movement and can spread over a wide area in a short period of time (Burge 1990). In suitable hosts, bioaerosols can cause both acute and chronic diseases, which may be infectious, allergenic, or toxigenic (Main 2003;Jung et al 2009a). Numerous engineering solutions, such as ultraviolet germicidal irradiation (UVGI) (Lin and Li 2002;Walker and Ko 2007), air electric ion emission , and thermal exposure, are under development as control methodologies for bioaerosols (Jung et al 2009a(Jung et al , 2009c.…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial Air Filtration Using AirborneSophora FlavescensNatural-Product Nanoparticles

Jung

Hwang

Park

et al. 2011

Aerosol Science and Technology

View full text Add to dashboard Cite

We investigated nanoparticle generation from a natural plant extract using the aerosol technique of the nebulization-thermal drying process, and tested its usefulness for antimicrobial air filtration. Sophora flavescens Ait. ethanolic extract was prepared as an antimicrobial natural-product suspension. Suspension droplets were generated using a single-jet Collison nebulizer, passed through an active carbon absorber to remove ethanol, and mixed and dried with sheath air. For drying, natural-product particles were exposed to 200 • C for ∼1 s. Finally, particles were introduced into a scanning mobility particle sizer, and their size distribution and morphology were analyzed. For application of natural-product particles to antimicrobial air filtration, the nanosized particles generated were deposited continuously onto air filter medium at various times. Physical characteristics (filtration efficiency, pressure drop, and fiber morphology by scanning electron microscopy), and biological characteristics (antimicrobial tests against Staphylococcus epidermidis, Bacillus subtilis, and Escherichia coli bioaerosols) were then evaluated. We also analyzed the chemical composition of particles deposited on the filter surface. The results showed that the nanoparticles generated were spherical and demonstrated a polydisperse size distribution, ranging from several tens to several hundred nanometers. Although the filter pressure drop increased with the amount of nanoparticle on the filter, the bioaerosol filtration efficiency and antimicrobial activity were enhanced. In particular, the S. flavescens natural-product nanoparticle-deposited filters were more effective for removal of Gram-positive than Gram-negative bioaerosols. These results are promising for the implementation of this new technology for control of air quality against hazardous bioaerosols.

show abstract

“…AgNP-loaded ceramic filters [503] and carbon fibers [504][505][506] were also approved as effective and sustainable water purification materials for household water treatment. Bioaerosols accumulating in ventilating and air-conditioning systems are capable of causing acute and chronic diseases [507,508]. AgNP-deposited activated carbon fibers have shown effective antimicrobial activities against Bacillus subtilis and E. coli by completely inhibiting bacterial growth within a 10-and 60-min time period, respectively [509].…”

Section: Antimicrobialsmentioning

confidence: 99%