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目的了解杭州市集中空调通风系统微生物污染状况,为制定有效的公共场所监管制度提供参考依据。方法于2013年-2015年随机抽取杭州市共63家单位的集中空调通风系统进行检测与分析。结果被检测到的56家单位中,送风中细菌总数、真菌总数以及β-溶血性链球菌的合格率分别为60.71%(34/56)、62.50%(35/56)和100.00%(56/56),送风中可吸入颗粒物、风管内表面积尘量和风管内表面细菌总数三者的合格率均为98.21%(55/56);风管内表面真菌总数的合格率为87.50%(49/56)。2013年风管内表面真菌总数的合格率(78.95%)与2015年(100.00%)差异有统计学意义(P<0.05),其他指标在不同年份之间差异无统计学意义(P>0.05)。结论杭州市集中空调通风系统卫生状况近年来有一定的改善,但仍存在一定程度的污染,应加大监管力度,改善公共场所集中空调通风系统的卫生状况。
Objective To understand the status of microbial contamination in central air conditioning and ventilation system in Hangzhou City and provide a reference for the formulation of an effective public place supervision system. Methods From 2013 to 2015, 63 central air conditioning and ventilation systems in Hangzhou City were randomly selected for testing and analysis. Results Among the 56 tested units, the total number of bacteria, total fungi and β-hemolytic streptococci were 60.71% (34/56), 62.50% (35/56) and 100.00% (56% / 56), the inhalable particles in the air supply, the dust volume on the inner surface of the air duct and the total number of bacteria on the inner surface of the air duct were all 98.21% (55/56); the total number of fungi on the inner surface of the duct was 87.50% (49 / 56). The total number of fungi on the inner surface of the wind tunnel in 2013 (78.95%) was significantly different from that in 2015 (100.00%) (P <0.05). The other indexes had no significant difference between years (P> 0.05). Conclusion The health status of central air conditioning and ventilation system in Hangzhou has been improved in recent years, but there is still some degree of pollution. Supervision should be intensified to improve the sanitation status of central air conditioning and ventilation system in public places.