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STUDY ON EFFICACY OF OZONE AIR DISINFECTOR IN KILLING MICROORGANISMS IN AIR

XU Yan,TAN Zhi,SUN Jun,WANG Xiao-lei,WANG Ling,RONG Yi (Jiangsu Provincial Center for Disease Prevention and Control,Nanjing 210009,China)  
Objective To observe the efficacy of ozone air disinfector in disinfection of indoor air and the speed of ozone degradation.Method Air microorganism sampling examination method was used to detect laboratory and field germicidal efficacy.Results In a 20 m~3 closed room,operation of the ozone air disinfector for 30 min produced 10.39 mg/m~3 ozone concentration in air and operation the disinfector for 60 min produced 18.82 mg/m~3 ozone concentration in air.After shuting down the disinfector and opening the window for ventilation for 30 min,the ozone concentration in air was lower than 0.2 mg/m~3.Operation of the ozone air disinfector for 30 min in a 20 m~3 closed room killed over 99.90% of Staphylococcus albus artificially sprayed in air.Operation of the ozone air disinfector for 60 min in a 40 m~3 closed room eradicated over 90% of natural bacteria in indoor air.Conclusion The ozone air disinfector produces high concentration of ozone in closed environment and has high efficacy in killing artificially sprayed bacteria and natural bacteria in room.
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