某综合管廊内微生物气溶胶污染和粒径分布特征

Pollution and size distribution characteristics of bioaerosol in utility tunnel

随着我国综合管廊的建设进程的推进,管廊内空气微生物气溶胶的污染与控制逐渐成为人们关注的热点问题。为探明综合管廊内微生物气溶胶的污染特征,选择南京某综合管廊的一般区段中部,潮湿区段中部及两条线路重叠交叉部等典型位置为对象,对各典型位置的可培养空气细菌、真菌浓度分布、污染特性和粒径分布特征进行了研究。结果表明:管廊内3个采样点空气微生物气溶胶的浓度存在显著性差异,其中一般区段中部的空气细菌浓度最高(516 CFU/m^(3)),空气真菌浓度的最高区域为潮湿区段中部(931 CFU/m^(3))。管廊内空气细菌平均浓度为333 CFU/m^(3),真菌平均浓度为851 CFU/m^(3)。管廊内通风对空气细菌的控制效果更好。研究结果为评价管廊内空气微生物污染现状和人员职业安全健康影响提供了参考。

With the progress of the construction of underground utility tunnels in China,pollution and control of microbiological aerosol from utility tunnels have gradually become the focus of people’s attention.In order to define the characteristics of microbial aerosol contamination in utility tunnels,such as the middle of a general section,the middle of a wet section and the overlapping intersection of two lines of the utility tunnel in the south of the Hexi New City of Nanjing were chosen as research objects,the concentration distribution,pollution characteristics and particle size distribution characteristics of the culturable airborne bacteria and fungi in typical location were studied.Results showed that concentrations of airborne microbial aerosols were completely different at the three sampling points within the utility tunnel,particularly highest for airborne bacteria in the middle of the general section(516 CFU/m^(3)),and highest airborne fungi in the middle of the wet section(931 CFU/m^(3)).The average concentration of airborne bacteria and fungi in the gallery were 333 CFU/m^(3)and 851 CFU/m^(3),respectively.The effect of ventilation on airborne bacteria was better.The results of the study provide a basis for the control of airborne microorganism in utility tunnel.