OBSERVATION ON EFFICACY OF AN AIR DISINFECTION-PURIFYING DEVICE IN DISINFECTION OF AIR IN STERILE SUPPLY SERVICE UNDER DAMP ENVIRONMENT IN THE SOUTH OF CHINA

Objective To observe the efficacy of air disinfection-purifying device in disinfection of air in underground sterile supply room under dump environment in south of China.Method Flat slab exposure method was used to examine the actual disinfection efficacy of this air disinfection-purifying device.Results In an unoccupied room about 55 m3 in volume,circulating purification of the air for 60 min with this air disinfection-purilfying device reduced the average count of natural bacteria in air from 785 cfu/m3 to 105 cfu/m3.After it worked for 180 minutes,no bacteria grew on the sampling slab.After it worked for 120 minutes,if two persons entered the room for common activities for less than 180 minutes,the total count of natural bacteria in air could be controlled at less than 200 cfu/m3.If three persons worked for 180 minutes in the room,the total bacteria count could achieve 366 cfu/m3.If five persons worked for 120 minutes,the total bacteria count could achieve 419 cfu/m3.Conclusion If the air disinfection-purfying device is used to disinfect the air in the underground sterile supply room under dump environment in south of China,the total bacteria count can be kept at category-II environment hygiene standard if the number of persons for common activities i nthe room is controlled at two.The total bacteria count would exceed the allowable limit with increasing the number of persons and prolonging the time.