A Systematic Literature Review of Indoor Air Disinfection Techniques for Airborne Bacterial Respiratory Pathogens

Nguyen, Thi Tham; Johnson, Graham; Bell, S. C.; Knibbs, Luke D.

doi:10.3390/ijerph19031197

Cited by 17 publications

(7 citation statements)

References 69 publications

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“…The extraction of total genomic DNA from microbial aerosol samples followed established protocols outlined in previous studies ( 13 , 14 ). The bacterial Genomic DNA Extraction Kit (Tangen, Catalog No.…”

Section: Methodsmentioning

confidence: 99%

“…Provide high-quality nutrients and a variety of bioactive enzymes conducive to digestive function for the host. Pathogenic members mainly include zoonotic pathogens such as Bacillus anthracis and Bacillus cereus (14) Psychrobacter Psychrobacter, another prevalent genus, holds clinical significance, with certain strains causing human infections, including ocular infections, bacteremia, endocarditis, and meningitis.…”

Section: Data Availability Statementmentioning

confidence: 99%

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The distribution characteristics of aerosol bacteria in different types of sheepfolds

Wang,

Yu,

Raheem

et al. 2024

Front. Vet. Sci.

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With the development of modern sheep raising technology, the increasing density of animals in sheep house leads to the accumulation of microbial aerosols in sheep house. It is an important prerequisite to grasp the characteristics of bacteria in aerosols in sheep house to solve the problems of air pollution and disease prevention and control in sheep house. In this study, the microorganisms present in the air of sheep houses were investigated to gain insights into the structure of bacterial communities and the prevalence of pathogenic bacteria. Samples from six sheep pens in each of three sheep farms, totaling 18, were collected in August 2022 from Ningxia province, China. A high-volume air sampler was utilized for aerosol collection within the sheep housing followed by DNA extraction for 16S rRNA sequencing. Employing high-throughput 16S rRNA sequencing technology, we conducted an in-depth analysis of microbial populations in various sheep pen air samples, enabling us to assess the community composition and diversity. The results revealed a total of 11,207 operational taxonomic units (OTUs) within the bacterial population across the air samples, encompassing 152 phyla, 298 classes, 517 orders, 853 families, 910 genera, and 482 species. Alpha diversity and beta diversity analysis indicated that differences in species diversity, evenness and coverage between different samples. At the bacterial phylum level, the dominant bacterial groups are Firmicutes, Proteobacteria, and Actinobacteria, among which Firmicutes (97.90–98.43%) is the highest. At the bacterial genus level, bacillus, Bacteroides, Fusobacterium, etc. had higher abundance, with Bacillus (85.47–89.87%) being the highest. Through an in-depth analysis of microbial diversity and a meticulous examination of pathogenic bacteria with high abundance in diverse sheep house air samples, the study provided valuable insights into the microbial diversity, abundance, and distinctive features of prevalent pathogenic bacteria in sheep house air. These findings serve as a foundation for guiding effective disease prevention and control strategies within sheep farming environments.

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Section: Methodsmentioning

confidence: 99%

Section: Data Availability Statementmentioning

confidence: 99%

The distribution characteristics of aerosol bacteria in different types of sheepfolds

Wang,

Yu,

Raheem

et al. 2024

Front. Vet. Sci.

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“…In this regard, there is evidence showing that airborne bacteria become more resistant to UV rays as relative humidity increases [84,105,117]. In addition, the use of an increased airflow rate passing through the UV system can result in a lower effectiveness of UV disinfection because microorganisms are exposed to UV rays for less time [84,105,106,118]. A low or a very high airflow temperature is also described to negatively affect the UV output, UV disinfection efficiency and susceptibility constants of microorganisms [84,105,106,117,118].…”

Section: Uv Light Technology-based Disinfection Systemsmentioning

confidence: 99%

Indoor Air Quality: A Review of Cleaning Technologies

et al. 2022

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Aims: Indoor air quality (IAQ) has attracted increased attention with the emergence of COVID-19. Ventilation is perhaps the area in which the most changes have been proposed in response to the emergency caused by this virus. However, other strategies are possible, such as source control and the extraction of pollutants. The latter incorporates clean technologies, an emergent area with respect to IAQ. Method: Various air treatment technologies can be used to control contaminants, which are reviewed and discussed in this work, including physicochemical technologies (e.g., filtration, adsorption, UV-photocatalytic oxidation, ultraviolet disinfection and ionization) and biological technologies (e.g., plant purification methods and microalgae-based methods). Results and interpretation: This work reviews currently available solutions and technologies for “cleaning” indoor air, with a focus on their advantages and disadvantages. One of the most common problems in this area is the emission of pollutants that are sometimes more dangerous to human health than those that the technologies were developed to remove. Another aspect to consider is the limitation of each technology in relation to the type of pollutants that need to be removed. Each of the investigated technologies works well for a family of pollutants with similar characteristics, but it is not applicable to all pollutant types. Thus, the optimal solution may involve the use of a combination of technologies to extend the scope of application, in addition to the development of new materials, for example, through the use of nanotechnology.

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“…Available solutions for air treatment rely on a variety of technologies that can be roughly categorized as either filtration technologies or inactivation technologies, either separately or in combination. − A technique often employed in contemporary practice is the filtration of air within heating, ventilation, and air conditioning (HVAC) systems, supported by established classification and criteria (e.g., ANSI/ASHRAE Standard 52.2–1999 and ISO 14 644–1 1999). , High-efficiency particulate air (HEPA) filters are based primarily on mechanical filtration, i.e., reducing the size of the pores through which the air flows to the size of the particles to be trapped. They can remove 99.97% of particles with a diameter of 0.3 μm or greater.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Optimization of a Novel UV-C LED Aerodynamic Device for Airborne Microbe Viability Abatement

Fornasaro,

Semeraro,

Gaetano

et al. 2024

ACS EST Eng.

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The escalation of the COVID-19 outbreak has significantly increased research into the transmission of airborne infectious diseases in indoor settings, underscoring the urgent necessity for affordable and efficient methods of air disinfection. The aim of the present work is the development of a complete framework based on designed experiments for exploring and optimizing the bioaerosol removal and inactivation efficiency of a novel air disinfection device. This device combines the aerodynamic effect of a three-dimensional vortex structure with UV-C radiation provided by commercially available UV-C lightemitting diodes (UV-C LEDs). The system was designed and tested to locally maintain a high radiation intensity that is suitable for bioaerosol disinfection. A controlled experimental laboratory model of bioaerosol aerosolization was set up by using an impinger medical vibrating nebulizer, a cylindrical chamber for bioaerosol travel, and an SKC BioSampler for collecting microorganisms capable of replicating. A nonpathogenic strain of E. coli (BL21-DE3) was used as a model of airborne bacteria. The inactivation efficiency was assessed based on the enumeration of the colonies originating from viable E. coli. Interactions between analytical factors and their optimal levels were investigated by using sequential D-optimal designs adapted to domain constraints and previous computational simulations of the aerodynamic performance of the device. Five experimental variables (the concentration of aerosolized bacteria; the size of aerosol particles; the volumetric airflow; the power of the LEDs; and two configurations of the device) were considered as factors in the optimization process. Response surfaces allowed for the identification of the ideal working conditions to maximize the efficiency of the device, an essential requirement for the device's future exploitation in real-world settings.

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A Systematic Literature Review of Indoor Air Disinfection Techniques for Airborne Bacterial Respiratory Pathogens

Cited by 17 publications

References 69 publications

The distribution characteristics of aerosol bacteria in different types of sheepfolds

The distribution characteristics of aerosol bacteria in different types of sheepfolds

Indoor Air Quality: A Review of Cleaning Technologies

Characterization and Optimization of a Novel UV-C LED Aerodynamic Device for Airborne Microbe Viability Abatement

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