| Recent studies have suggested a link between exposure to ambient particulate matter <2.5μM in diameter and the hospital acquired infection. The conventional ways only temporarily reduced or inactivate the bacteria, parasites, viruses and microorganisms. However, this approach could not provide a continuously work in the environment with people. Due to exposion to fine particulate, especially to microorganism aerosol, air pollution consider as a major cause of in-hospital infections and the conventional way have nothing to do with air particulate matter <2.5μM, the dynamic air disinfection has obvious adventage and distinctions. A dynamic air disinfecting equipment contains a high strength built-in ultraviolet irradiation function, a laminar filter system, an oxygen anion generator and a starting device to survey the source of pollution automatically. Each part of the equipment is expensive and hard to maintain. Compared with conventional air disinfection way, dynamic air disinfection equipment could provide constantly purified ambient and control the germ and bacteria's concentration under specific level which would facilitate to the recover of patients. Purpose of our study is to eveluate the effect of dynamic air disinfecting equipment and to estimate its feasibility in hospital.Our study conducted as three part as follows:(1) Detection of air quality in hospital environment 5intensive care unit was selected as the study objects and then the degradation rates of inhalable particles and Staphylococcus were detected and analyzed by laser-dust counter. then observe on particles with Scaning Electron Microscope.(2) Detection of efficacy of new type air purification system3air simulated cabins was selected as the study objects and were randomly divided into3groups, group A (TA100air purifier), group B(TA1000air purifier), and blank control group C (no air purifier). And then the degradation rates of inhalable particles was measured with laser aerosol particle counter, Staphylococcus was measured with Anderson sampler, and formaldehyde of each group was measured with spectrophotometer.(3) Detection of efficacy of new type air purification system in intensive care unit2intensive care unit with the same area were selected as the study objects and were randomly divided into2groups, study group (air purifier is on), and blank control group (no air purifier). And then the dynamic degradation rates of inhalable particles was measured and analyzed with laser aerosol particle counter.RESULT:(1) Present situation of air quality in hospitalThe concentration of PM2.5and PM10in5hospital is (260096.7±33097.39)/m3,(260980.5±33214.69315)/m3respectively. PM2.5is important part of PM10,the amount of particles decrease with the increase of its grain size.(2) Efficacy of new type of air purification system in purification of indoor air①The1h degradation rates of inhalable particles of group A and B is47%,56%respectively, The2h degradation rates of group A and B is73.6%,77.8%respectively. Both groups were significantly higher than the blank control group C (P<0.01).②The2h degradation rates of Staphylococcus of group A and B is94.47%and99.99%respectively. Both groups were significantly higher than that of blank control group C (P<0.01)③The2h degradation rates of formaldehyde of group A and B is74%and83%respectively. Both groups were significantly higher than that of blank control group C (P<0.01)(2) Efficacy of new type of air purification system in purification of intensive care unitThe concentration of PM10and PM2.5in5study group(TA2000air purifer was on) hospital is197951/m3and197440/m3respectively. Both of them are lower than blank control group (P<0.05). The concentration of inhalable particles of study group is lower than blank control group. This study revealed that qualiy of ambient air in selected hospital was disturbing. Traditional methods could not provide a satisfactory quality of air to meet the requirement in high-ranking hospital. The dynamic air disinfecting system domenstrated a high efficacy in air purificatiion and in processing ambient particulate matters.This study has provided basicmaterials for the further study of the distribution rules of the microbial aerosols of the air inside the hospital rooms and has offered scientific grounds for the administration.
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