Bioaerosol Inactivation by a Cold Plasma Ionizer Coupled with an Electrostatic Precipitator

Area of Science:

• Environmental Science
• Microbiology
• Engineering

Background:

• Airborne infectious diseases spread via bioaerosols, necessitating new control strategies beyond air purification.
• Cold plasma technology presents a potential solution for bioaerosol inactivation.

Purpose of the Study:

• To evaluate the efficacy of cold plasma ionizer (CPI) and CPI-ESP devices in inactivating airborne microorganisms.
• To investigate the mechanism of bacterial cell membrane damage by cold plasma.

Main Methods:

• Testing CPI and CPI-ESP devices against surface-spread porcine respiratory coronavirus and Escherichia coli.
• Assessing CPI-ESP efficacy on aerosolized E. coli and naturally occurring airborne microbes in various indoor settings.
• Utilizing fluorescence microscopy to examine bacterial cell membrane damage.

Main Results:

• CPI-ESP effectively inactivated surface-spread viruses and bacteria.
• CPI-ESP demonstrated efficacy in reducing aerosolized E. coli and airborne microbes.
• Cold plasma treatment caused varying degrees of E. coli cell membrane damage.

Conclusions:

• Cold plasma technology, particularly CPI-ESP, shows significant potential for controlling airborne infectious diseases.
• The technology is effective against both surface and airborne microbes in diverse environments.
• Understanding the disinfection mechanism aids in optimizing cold plasma applications for public health.