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  • Title: [Assessment of the air quality improment of cleaning and disinfection on central air-conditioning ventilation system].
    Author: Liu H, Zhang L, Feng L, Wang F, Xue Z.
    Journal: Wei Sheng Yan Jiu; 2009 Sep; 38(5):576-8. PubMed ID: 19877519.
    Abstract:
    OBJECTIVE: To assess the effect of air quality of cleaning and disinfection on central air-conditioning ventilation systems. METHOD: 102 air-conditioning ventilation systems in 46 public facilities were sampled and investigated based on Hygienic assessment criterion of cleaning and disinfection of public central air-conditioning systems. RESULTS: Median dust volume decreased from 41.8 g/m2 to 0.4 g/m2, and the percentage of pipes meeting the national standard for dust decreased from 17.3% (13/60) to 100% (62/62). In the dust, median aerobic bacterial count decreased from 14 cfu/cm2 to 1 cfu/cm2. Median aerobic fungus count decreased from 10 cfu/cm2 to 0 cfu/cm2. The percentage of pipes with bacterial and fungus counts meeting the national standard increased from 92.4% (171/185) and 82.2% (152/185) to 99.4% (165/166) and 100% (166/166), respectively. In the ventilation air, median aerobic bacterial count decreased from 756 cfu/m3 to 229 cfu/m3. Median aerobic fungus count decreased from 382 cfu/m3 to 120 cfu/m3. The percentage of pipes meeting the national standard for ventilation air increased from 33.3% (81/243) and 62.1% (151/243) to 79.8% (292/366) and 87.7% (242/276), respectively. But PM10 rose from 0.060 mg/m3 to 0.068 mg/m3, and the percentage of pipes meeting the national standard for PM10 increased from 74.2% (13/60) to 90.2% (46/51). CONCLUSION: The cleaning and disinfection of central air-conditioning ventilation systems could have a beneficial effect of air quality.
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