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Title: Application of an air purification system to control air-borne bacterial contamination in a University clinic
Authors: Chan, DWT
Law, KC
Kwan, CHS
Chiu, WY
Keywords: Air purification
Bacteria count
Photo-catalytic oxidation (PCO)
Titanium dioxide
Ultraviolet light
Issue Date: 2005
Publisher: Hong Kong Institution of Engineers
Source: HKIE transactions, 2005, v. 12, no. 1, p. 17-21 How to cite?
Journal: HKIE transactions 
Abstract: Indoor air purification has become a popular issue since the outbreak of severe acute respiratory syndromes (SARS) in 2003. Bacterial and viral contamination in indoor air has become a serious concern in healthcare facilities. In addition, there was a market boom in air purification products during the outbreak. This paper reviews the major techniques available for bacteria removal, including ultraviolet (UV) germicidal irradiation, photo-catalytic oxidation, filtration using HEPA filters and ozone disinfection; and describes the testing results of an air purification system in a university clinic. The system is installed with UV lamps and titanium dioxide honeycomb section for photo-catalytic oxidation. Total bacteria count was measured to test the effectiveness of the system. Without the use of purifier, the bacteria count could reach 500-600 cfu/m 3 when there were 18 persons or more In the clinic waiting area. The air purifier can reduce the bacteria count to 400-450 cfu/m 3 under similar occupancy condition. In addition, two bacteria decay profiles were measured after clinic service hour. The one with the use of air purifier could achieve a decay rate of 4.72 hour 1, comparing with the natural decay rate of 0.95 hour 1.
ISSN: 1023-697X
EISSN: 2326-3733
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