A facile and cost-effective method for removal of indoor airborne psychrotrophic bacterial and fungal flora based on silver and zinc oxide nanoparticles decorated on fibrous air filter

Pokhum, Chonlada; Intasanta, Varol; Yaipimai, Wittaya; Subjalearndee, Nakarin; Srisitthiratkul, Chutima; Pongsorrarith, Voraluck; Phanomkate, Nipon; Chawengkijwanich, Chamorn

doi:10.1016/j.apr.2017.08.005

Cited by 23 publications

(15 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Airborne microorganisms, along with PM, moisture and organic matter from the whole room, are pumped into the air purifier compulsively and intercepted on the filter in an air purifier via its high dust-holding capacity 55,56 . Indoor bacteria are trapped in the fine porous structures of the HEPA filters 55 , but the trapped bacteria are not killed 57 . Atmospheric dust deposited in air filters may serve as a nutrient for microbes 20 .…”

Section: Effect Of Occupancy Density On the Bacterial Community In Thmentioning

confidence: 99%

“…Atmospheric dust deposited in air filters may serve as a nutrient for microbes 20 . Accompanied by the absorption of organic matter to the filter, the filter changes gradually, forming a more favorable habitat for the microorganisms 57 . The more nutritious habitat might explain the higher proportion of viable bacteria in the filter (Fig.…”

Section: Effect Of Occupancy Density On the Bacterial Community In Thmentioning

confidence: 99%

“…The HEPA filter in the air purifier should be considered as a new ecological niche owing to its enrichment of particles and quite different bacterial sources and bacterial community structure. Air purifiers remove PM by pumping air, and the environmental bacteria are trapped by the HEPA filters 55,57 . Thus, various bacteria possibly tend to keep alive on the filter.…”

Section: Effect Of Occupancy Density On the Bacterial Community In Thmentioning

confidence: 99%

See 2 more Smart Citations

Bacterial community analysis of floor dust and HEPA filters in air purifiers used in office rooms in ILAS, Beijing

Guo

Xiong

Kang

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Air purifiers with high-efficiency particulate air (HEPA) filters remove not only particulate matter but also airborne microorganisms in indoor environments. We investigated the bacterial community in HEPA filters (used for 1 year) and that in the floor dust of 12 office rooms in Beijing. We found that the viable bacteria proportion in the filter was significantly higher than that in the floor dust (p < 0.001). The Non-Metric Multi-Dimensional Scaling analysis showed that the bacterial communities in the filters and dust were significantly different (p = 0.001). The Chao1, Shannon-Wiener and phylogenetic diversity values in the filter were significantly higher than those in the dust (p < 0.001). The predominant bacterial classes in the filter were Alphaproteobacteria and Actinobacteria, whereas those in the dust were Bacteroidia, Clostridia and Bacilli. Human occupancy contributed more to the bacterial community in the filter than that in the dust. Klebsiella and Alloprevotella in the dust and filters positively correlated with the occupancy density. Soil bacteria contributed to a significantly higher proportion of the bacteria in the HEPA filter (p < 0.001). In contrast, human oral, indoor air and outdoor haze contributed to a higher proportion of the bacteria in the dust samples (p < 0.001, p < 0.01 and p < 0.05, respectively). As HEPA filters serve as an ecological niche for indoor bacteria, they should be carefully investigated during the assessment of indoor environmental health. People spend the majority of their time indoors, wherein air pollution levels highly correlate with outdoor pollution levels 1-6. In recent years, haze pollution, fine particulate matter (PM) in particular, has been reported to increase human mortality rates owing to the development of heart disease 7,8 , stroke, respiratory disease 9 and lung cancer 10,11. The level of air pollution in China is substantially higher than in many developed countries 12. Moreover, its threat to public health has become a serious concern, particularly concerning haze events 13. Thus, an effective technology is essential for the removal of PM from indoor environments during periods of haze. To this end, air purifiers with high-efficiency particulate air (HEPA) filters are widely used in the indoor environment, particularly in areas with heavy haze 14. People are exposed to various microbes in indoor environments. Many factors could affect indoor microbial composition, including human occupancy, occupant behavior, pets and outdoor environment 15-18. The air purifier was mainly used to remove indoor PM, partly comprising microorganisms. Microbes in the air could be transmitted to the HEPA filter in the air purifier. Suzuki et al. (2003) collected swab samples from the air purifier filters in the houses of seven healthy children with varicella. They found the varicella-zoster virus was detected in 29% of filters in air purifiers by day 3 19. Furthermore, Maus et al. (2001) studied the effect of the filters on the viability of microbes. They reported microb...

show abstract

Section: Effect Of Occupancy Density On the Bacterial Community In Thmentioning

confidence: 99%

Section: Effect Of Occupancy Density On the Bacterial Community In Thmentioning

confidence: 99%

Section: Effect Of Occupancy Density On the Bacterial Community In Thmentioning

confidence: 99%

See 1 more Smart Citation

Bacterial community analysis of floor dust and HEPA filters in air purifiers used in office rooms in ILAS, Beijing

Guo

Xiong

Kang

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…It was reported that microbes could stay viable in the filters for a long period of time and may enter back into the filtered air. The filter forms a more favorable environment for the microorganisms to grow [43]. Another drawback of HEPA filters is that they are extremely expensive due to high energy cost which is required for powerful fans to generate sufficient airflow through the filter to eventually clean the indoor air [42].…”

Section: High Efficiency Particulatementioning

confidence: 99%

Untitled

2021

IJCMCR

View full text Add to dashboard Cite

Patient safety and health worker safety from infectious diseases as well as occupational hazards is of utmost importance in every field of medicine. Bioaerosols and splatters generated by air syringes, ultrasonic scalers and high-speed turbine handpieces during dental treatment pose a potential hazard of infection not only to the patients but, to the dentists, dental hygienists, dental assistants as well as other healthcare workers. Severe infectious diseases such as Severe Acute Respiratory Syndrome (SARS), influenza, measles, tuberculosis, hepatitis, HIV AIDS can be transmitted through aerosols. With the emergence of β-coronavirus (COVID-19), questions concerning the protection from such viral transmission in dental hospital setting have arisen due to close contact and its transmission through the exposure of saliva, blood and other body fluids. Guidelines from regulatory organizations such as CDC regarding infection control in healthcare settings and infection prevention practices should be strictly followed. A systematic electronic search with relevant key terms viz. Aerosol Management, Dental Aerosols, Dentistry and COVID-19, Dental Unit Waterlines, Preprocedural Mouth rinsing, High Volume Suction Evacuators (HVE) and CDC Guidelines was executed in PubMed and Medline databases for literature extraction and data has been interpreted by including articles based on predefined inclusion criteria .In this review article, we address the importance of understanding and implementation of dental safety by following various systems for management of dental aerosols.

show abstract

“…The multiplied microorganisms with their microbial volatile organic compounds may be released into the air (Park and Jang, 2003;Verdenelli et al, 2003;Cecchini et al, 2004;Byeon et al, 2007). To address this issue, antimicrobial filters with prompt antimicrobial activity have been fabricated by coating air filter media with various antimicrobial agents (Sim et al, 2015;Taylor et al, 2016;Choi et al, 2018;Pokhum et al, 2018;Ren et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Dry Aerosol Coating of Anti-viral Particles on Commercial Air Filters Using a High-volume Flow Atomizer

Park

Joe

Hwang

2019

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Filtration is a common air cleaning technique used to remove airborne particulates. However, microorganisms can survive and multiply on the filter's surface in heating, ventilation, and air-conditioning systems. These multiplied microorganisms eventually disperse in the air. The most conventional method of coating pristine air filter media with anti-viral material involves applying a wet coating via solution processing, wherein the filter media needs to be soaked in a solution containing a large amount of dispersed anti-viral material, and then drying the coated filter using a heated air flow. However, the latter step requires additional time and energy and often causes the deformation of the filter material. By contrast, applying an aerosolized coating is a dry process, wherein aerosolized anti-viral material is directly deposited on the filter at atmospheric pressure and room temperature. In this work, we design a laboratory-made atomizer to generate highly concentrated aerosolized particles at a high flow rate (> 200 L min -1 ). The generated anti-viral material (SiO 2 -Ag nanoparticles), which includes liquid droplets, is dried by a sheath air flow and directly applied to a commercial air filter unit. The coated antiviral filter is evaluated for filtration efficiency and anti-viral activity against aerosolized MS2 bacteriophage.

show abstract

A facile and cost-effective method for removal of indoor airborne psychrotrophic bacterial and fungal flora based on silver and zinc oxide nanoparticles decorated on fibrous air filter

Cited by 23 publications

References 30 publications

Bacterial community analysis of floor dust and HEPA filters in air purifiers used in office rooms in ILAS, Beijing

Bacterial community analysis of floor dust and HEPA filters in air purifiers used in office rooms in ILAS, Beijing

Untitled

Dry Aerosol Coating of Anti-viral Particles on Commercial Air Filters Using a High-volume Flow Atomizer

Contact Info

Product

Resources

About