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CHANGES IN BACTERIAL AEROSOLS WITH HEIGHT ABOVE AERATION TANKS

机译：曝气池以上高度的细菌气溶胶的变化

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This paper describes the results of a study conducted to determine the fate of bacterial aerosol emissions from aeration tanks of an activated sludge treatment plant relative to the height above the liquid surface. Bacterial aerosols were collected using Andersen six-stage viable samplers positioned at heights ranging from 7.6 to 318 cm above the aeration tank liquid surface. Samples were analyzed for heterotrophic plate count (HPC), total coliform (TC), fecal coliform (FC), and fecal streptococci (FS). A statistical analysis of the data indicates that HPC and TC concentrations decreased exponentially with height above the aeration tank liquid surface. Fecal coliform and FS concentrations were low or below detection limits (<4 cfu/m(3)) in the collected samples and showed no decrease with height. This study demonstrates that a significant decline in number of aerosolized bacteria (leaving the surface of an aeration tank) occurs within the air column directly above the aeration tank liquid surface. Also, bacteria of potential public health concern, such as FC and FS, often reach nondetectable levels (<4 cfw/m(3)) within one meter above the liquid surface of these aeration tanks. [References: 17]
机译：本文描述了一项研究的结果，该研究旨在确定活性污泥处理厂曝气池中细菌气溶胶的排放相对于液面上方高度的命运。使用安达信六级可行采样器收集细菌气溶胶，采样器位于曝气池液体表面上方7.6至318 cm的高度范围内。分析样品的异养菌板数（HPC），总大肠菌群（TC），粪便大肠菌群（FC）和粪便链球菌（FS）。数据的统计分析表明，HPC和TC浓度随曝气池液体表面上方的高度呈指数下降。粪便中的大肠菌群和FS浓度较低或低于检测极限（<4 cfu / m（3）），并且未随高度增加而降低。这项研究表明，在曝气池液体表面正上方的气柱内，雾化细菌的数量显着下降（离开曝气池表面）。此外，潜在的公共卫生问题细菌，例如FC和FS，通常在这些曝气池的液面上方一米之内达到不可检测的水平（<4 cfw / m（3））。 [参考：17]

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