|Document ID (ISN)||65462|
|ISSN - Serial title
||1047-322X - Applied Occupational and Environmental Hygiene
|Convention or series no.
||Burkhart J.E., Stanevich R., Kovak B.
||Microorganism contamination of HVAC humidification systems - Case study
||Dec. 1993, Vol.8, No.12, p.1010-1014. Illus. 8 ref.
||Water samples were collected from humidification system water reservoir pans in a large office building. Air washers and steam injection humidification systems are used in the building. Streptococcus and Pseudomonas were found to be the most predominant microorganisms. Only small quantities of bacteria were found in the steam systems, while water collected from the air wash systems was highly contaminated. Data were also available to test the effectiveness of the cleaning system. A sample collected one day before cleaning had 58,100 colony forming units per millilitre (CFU/mL). Samples collected one and two days after cleaning had 250,200 and 258,160 CFU/mL, respectively. This demonstrates not only that the cleaning process is ineffective biologically but also that it may increase the risk of bioaerosol contamination. Sample concentrations, in colony forming units per millilitre, were found to be quite different depending upon the side of the baffle plates from which the sample was collected.
||heating systems; microorganisms; buildings; determination of concentration; air conditioning; air humidification; ventilation systems
||contamination monitoring; case study; thermophilic fungi; steam cleaning; fungi; taking of samples; bacteria
||D - Periodical articles
|Country / State or Province||USA|
||Heating, ventilation and climate
|Broad subject area(s)
||Heating and air conditioning