Eco-friendly Air Decontamination of Biological Warfare Agents Using “Counterfog” System

Martín-Pérez, Tania; Llerena-Aguilar, Francisco-José; Pérez-Serrano, Jorge; Copa-Patiño, José Luis; Carranza, Juan Soliveri de; Orellana-Muriana, José-María; Pérez-Díaz, José-Luis

doi:10.1007/978-3-319-91791-7_14

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…If the projected liquid is a biocide, the biological particles are neutralized as they collapse with the fog droplets. The layer of liquid formed after the application of the fog should be extremely thin, allowing its evaporation in a few minutes depending on the environmental conditions, guaranteeing the necessary time to disinfect said surfaces [9].…”

Section: Introductionmentioning

confidence: 99%

Fast surface disinfection with COUNTERFOG® SDR-F05A+

Díaz

García-Casarrubios

Carranza³

et al. 2021

Eur. Phys. J. Plus

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COUNTERFOG® has been proposed as a rapid decontamination and disinfection technology that uses dynamic submicrometric-disinfecting fog cones. When projected onto surfaces, they create a micrometre-thick film of disinfectant minimizing the use of liquids and the impact on environment. The extremely thin film is intended to be enough to cover and kill microorganisms and simultaneously thin enough to evaporate in a few minutes-depending on the environmental conditions. In the present work, experimental tests were carried out to verify this hypothesis. These include a physical characterization of the fog in the cone, a measurement of the liquid flow projected on surfaces as well as disinfection tests with a series of microorganisms. In addition to these results, operational recommendations are derived to ensure disinfection reliability.

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Section: Introductionmentioning

confidence: 99%

Fast surface disinfection with COUNTERFOG® SDR-F05A+

Díaz

García-Casarrubios

Carranza³

et al. 2021

Eur. Phys. J. Plus

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“…Preliminary tests with Bacillus thuringiensis var. kurstaki spores were also performed with encouraging results [34]. This device can produce different types of fog composed of any liquid and dynamics depending on their operating parameters.…”

Section: Introductionmentioning

confidence: 91%

Optimal Fast Integral Decontamination of Bacillus thuringiensis Aerosols and Fast Disinfection of Contaminated Surfaces

et al. 2023

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Aerosolized anthrax (Bacillus anthracis) spores are of extreme health concern and can remain airborne for hours and contaminate all kinds of surfaces, constituting reservoirs from which resuspension is easily produced. The assessment of decontamination techniques must therefore consider both air and surfaces. In the present study, several kinds of disinfecting fogs were experimentally tested against Bacillus thuringiensis spores, which served as a surrogate for Bacillus anthracis, both as aerosols released into the air and spread on porous and non-porous surfaces with different positions and orientations. This technology removed Bacillus thuringiensis spores from the air in 20 min with just a 1 min application of fog. The dynamics and characteristics of the fog, related to aerosol and surface interactions, proved to be critical for optimal performance and decontamination. An optimal configuration could provide effective disinfection even on indirectly reached surfaces. In all cases, 8% hydrogen peroxide (H2O2) provided a higher disinfection rate than 2% glutaraldehyde.

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“…It has been previously demonstrated that this new technology can either be used against biological agents, being able to efficiently reduce the amount of viable of Bacillus thurigiensis spores from the air after 5 min of the fog release (Martín-Pérez et al, 2018 ); or other inert agents, COUNTERFOG® system was able to reduce the number of solid particles from the combustion of the Diesel in a percentage close to 100% in the case of particles of sizes 2.5 μm, 5 μm and 10 μm diameter in a time not exceeding 30 min (Pérez-Díaz et al, 2019 ). COUNTERFOG® is presented as an efficient and safe to use alternative for large scale decontamination and disinfection of submicrometric agents that suppose a threat for the environmental and public health.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Surface Disinfection Effectiveness of Decontamination System COUNTERFOG® SDR-F05A+ Against Bacteriophage ɸ29

et al. 2022

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The experience of COVID19 pandemic has demonstrated the real concern of biological agents dispersed in the air and surfaces environments. Therefore, the need of a fast and large-scale disinfection method has arisen for prevention of contagion. COUNTERFOG® is an innovative technology developed for large-scale decontamination of air and surfaces. The objective of this study is to assess experimentally the effectiveness of COUNTERFOG® in disinfecting viral-contaminated surfaces. We also aim to measure the necessary time to disinfect said surfaces. Stainless steel surfaces were contaminated with bacteriophage φ29 and disinfected using COUNTERFOG® SDR-F05A+, which uses a sodium hypochlorite solution at different concentrations and for different exposure times. A log reduction over 6 logs of virus titer is obtained in 1 min with 1.2% sodium hypochlorite when the application is direct; while at a radial distance of 5 cm from the point of application the disinfection reaches a reduction of 5.5 logs in 8 min. In the same way, a higher dilution of the sodium hypochlorite concentration (0.7% NaOCl) requires more exposure time (16 min) to obtain the same log reduction (> 6 logs). COUNTERFOG® creates, in a short time and at a distance of 2 m from the point of application, a thin layer of disinfectant that covers the surfaces. The selection of the concentration and exposure time is critical for the efficacy of disinfection. These tests demonstrate that a concentration between 0.7- 1.2% sodium hypochlorite is enough for a fast and efficient ɸ29 phage inactivation. The fact that ɸ29 phage is more resistant to disinfection than SARS-CoV-2 sustains this disinfection procedure.

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Eco-friendly Air Decontamination of Biological Warfare Agents Using “Counterfog” System

Cited by 5 publications

References 10 publications

Fast surface disinfection with COUNTERFOG® SDR-F05A+

Fast surface disinfection with COUNTERFOG® SDR-F05A+

Optimal Fast Integral Decontamination of Bacillus thuringiensis Aerosols and Fast Disinfection of Contaminated Surfaces

Assessment of Surface Disinfection Effectiveness of Decontamination System COUNTERFOG® SDR-F05A+ Against Bacteriophage ɸ29

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