State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; National Engineering Laboratory for VOCs Pollution Control Material & Technology, University of Chinese Academy of Sciences, Beijing 101408, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Sci Total Environ. 2018 Mar 15;618:469-478. doi: 10.1016/j.scitotenv.2017.11.071. Epub 2017 Nov 11.
Municipal wastewater treatment plants (MWTPs) are regarded as sources of airborne microorganisms. Sludge dewatering house (SDH) is one of the most serious indoor bioaerosol pollution treatment sectors in MWTPs. In this study, properties of bioaerosols from SDHs of nine MWTPs were investigated in China. Results suggested that bioaerosols were generated mainly from the mixed liquor and will be promoted by the mechanical motion of belts of dewatering devices. They will accumulate in the SDHs due to the treatment devices placed inside. Levels of airborne bacteria and chemicals showed regional variations. In Hefei and Yixing, the emissions of total suspended particles (TSP) and airborne bacteria were higher than those in Beijing and Guangzhou. Results of bacterial population showed that bacterial species in bioaerosols from SDHs also presented significant regional disparity; these regional disparities were closely related with the source of bioaerosols in SDHs. Among these identified bacterial species, some common potential pathogens were detected in all SDHs, such as Aeromonas caviae, Flavobacterium sp., and Staphylococcus lentus. Relative humidity (RH) and temperature were the major parameters on bioaerosols to survive. As shown in this study, SDHs in wastewater treatment plants should be provided considerable attention for being an emission source of indoor bioaerosols.
城市污水处理厂（MWTPs）被认为是空气传播微生物的来源。污泥脱水房（SDH）是 MWTPs 中室内生物气溶胶污染最严重的处理区域之一。本研究在中国调查了九个 MWTPs 的 SDH 中的生物气溶胶特性。结果表明，生物气溶胶主要由混合液产生，并会受到脱水设备皮带的机械运动的推动。由于内部处理设备，它们会在 SDH 中积累。空气中细菌和化学物质的水平存在区域差异。在合肥和宜兴，总悬浮颗粒物（TSP）和空气中细菌的排放量高于北京和广州。细菌种群的结果表明，SDH 中生物气溶胶中的细菌种类也表现出显著的区域差异；这些区域差异与 SDH 中生物气溶胶的来源密切相关。在这些鉴定出的细菌种类中，在所有 SDH 中都检测到了一些常见的潜在病原体，如豚鼠气单胞菌、黄杆菌和迟缓葡萄球菌。相对湿度（RH）和温度是生物气溶胶存活的主要参数。如本研究所示，污水处理厂的 SDH 应作为室内生物气溶胶的排放源引起相当的重视。
