Air Disinfection by Atmospheric Pressure Grating-like Dielectric Barrier Discharge Plasma
Air purification and disinfection are effective measures for the control of respiratory infectious diseases.Die-lectric barrier discharge(DBD)is a promising method for air disinfection due to its high efficiency,large discharge area,and low airflow resistance;however,the research on its disinfection characteristics,factors,and dosage is rarely available in the literature.This paper provides a brief introduction of the recent research progress in air disinfection by grating-like DBD plasma from the Gas Discharge and Plasma Research Team in the Department of Electrical Engineering at Tsinghua University.In terms of disinfection characteristics,the effects of discharge structural parameters,humidity,microbial spe-cies,voltage type,and other factors was mainly investigated.It was found that narrowing the gap,increasing electrode size,and increasing airflow humidity could all improve both efficiency and Z-value.When the relative humidity(RH)was 60％,the Z-value could reach 1.68 L/J.The single-pass removal efficiency of MS2 bacteriophage aerosol could reach 99.5％～99.9％.In terms of bactericidal factors,experiments showed that gas-phase short-lived species were the major contributors to bacterial inactivation,with long-lived species accounting for at most 30％of the total bactericidal effect.In terms of disinfection dosage,specific energy density(SED)was proposed as the dose parameter for plasma-based air dis-infection.Based on the chemical kinetic model of wet-air plasma discharge,a linear relationship between single-specie dose and power density was discovered,illustrating why SED could be served as the dose.This study can provide theo-retical and engineering support for DBD-plasma-based air disinfection.
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