Comparison of disinfection performance of UVC-LED and conventional upper-room UVGI systems.

Abstract:

:We developed a novel, compact upper-room ultraviolet germicidal irradiation system with light-emitting diode sources (UR-UVGI-LED) to enhance the disinfection of bioaerosols in an enclosed room space. Its effectiveness was evaluated and compared with the conventional upper-room ultraviolet germicidal irradiation system with mercury vapor sources (UR-UVGI-MV). Escherichia coli, Serratia marcescens, and Staphylococcus epidermidis were atomized under the well-mixed condition and exposed to UR-UVGI-LED (or UR-UVGI-MV) device. The intensity output of the UR-UVGI-LED was also varied from 0% (no LED), 25%, 50% to 100% to further evaluate the UR-UVGI-LED disinfection effectiveness under different power levels. The decay rates for UR-UVGI-LED ranged from -0.1420 ± 0.04 min-1 to -0.3331 ± 0.07 min-1 for Escherichia coli, -0.1288 ± 0.01 min-1 to -0.3583 ± 0.02 min-1 for Serratia marcescens, and -0.0330 ± 0.01 min-1 to -0.0487 ± 0.01 min-1 for Staphylococcus epidermidis. It was noticed that the intensity level had a non-linear influence on the UR-UVGI-LED's performance. The decay rates achieved by the UR-UVGI-MV system were -0.3867 ± 0.08 min-1 , -0.4745 ± 0.002 min-1 , and -0.1624 ± 0.02 min-1 for Escherichia coli, Serratia marcescens, and Staphylococcus epidermidis, respectively. Hence, the disinfection performance of both UR-UVGI-LED and UR-UVGI-MV systems was comparable for Escherichia coli and Serratia marcescens. These results demonstrate that the UR-UVGI-LED system has a high potential to be used as a safe and effective irradiated light source to disinfect indoor airborne pathogens.

journal_name

Indoor Air

journal_title

Indoor air

authors

Nunayon SS,Zhang H,Lai ACK

doi

10.1111/ina.12619

subject

Has Abstract

pub_date

2020-01-01 00:00:00

pages

180-191

issue

1

eissn

0905-6947

issn

1600-0668

journal_volume

30

pub_type

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