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首页> 外文期刊>Aerobiologia >Collection characteristics of a batch-type wetted wall bioaerosol sampling cyclone
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Collection characteristics of a batch-type wetted wall bioaerosol sampling cyclone

机译：分批式湿壁生物气溶胶采样旋风分离器的收集特性

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摘要

The collection efficiency and sample retention of a batch-type wetted wall bioaerosol sampling cyclone (BWWC) were experimentally characterized. The BWWC is designed to sample air at 400 1/min and concentrate the particles into 12 ml of water. Aerosol is transported into a cylin-drically-shaped axial flow cyclone through a tangential slot and the particles are impacted on the inner wall, which is wetted by air shear acting on a liquid pool at the base of the cyclone. The retention of collected particles and the aerosol collection efficiency of the BWWC were evaluated with polystyrene latex beads (PSL), sodium fluorescein/oleic acid droplets, and Bacillus atrophaeus (aka BG) spores. The retention of particles was determined by adding hydrosol directly into the device, running the BWWC for a pre-set period of time, and then determining the amount of paniculate matter recovered relative to the initial amount. For 1-μm diameter PSL, 90% of the particles were recoverable from the cyclone body immediately after their introduction; however, only 10% were retained in the collection liquid after 8 h of operation. The aerosol sampling efficiency was determined by comparing the amount of paniculaternmatter collected in the liquid with that collected by a reference filter. The collection efficiency was 50-60% for 1- and 3-μm polystyrene (PSL) particles, and 1.5% for 10-μm oleic acid particles. The efficiency for 3-μm oleic acid droplets was 35%. Explanations are provided for the difference between liquid and solid particle behavior, and for the low efficiency for the large liquid particles. The collection efficiency for single spore BG was slightly lower than that for 1-μm PSL.
机译：批处理式湿壁生物气溶胶采样旋风器（BWWC）的收集效率和样品保留率进行了实验表征。 BWWC旨在以400 1 / min的速度采样空气，并将颗粒浓缩到12 ml水中。气雾剂通过切向缝隙被输送到圆柱状的轴流旋风分离器中，颗粒撞击在内壁上，内壁被空气剪切作用在旋风分离器底部的液池上润湿。使用聚苯乙烯乳胶珠（PSL），荧光素钠/油酸小滴和萎缩芽孢杆菌（aka BG）孢子评估BWWC的保留颗粒物和气溶胶收集效率。通过将水溶胶直接添加到设备中，运行BWWC一段预设的时间，然后确定相对于初始量回收的颗粒物的量，来确定颗粒的保留率。对于直径为1μm的PSL，在引入旋风分离器后立即可以从旋风分离器中回收90％的颗粒。但是，操作8小时后，收集液中仅保留10％。通过比较液体中收集到的paniculaternmatter的量与参考过滤器收集到的paniculaternmatter的量来确定气溶胶采样效率。 1-和3-μm聚苯乙烯（PSL）颗粒的收集效率为50-60％，10-μm油酸颗粒的收集效率为1.5％。 3-μm油酸滴的效率为35％。提供了关于液体和固体颗粒行为之间差异以及大液体颗粒效率低的解释。单孢子BG的收集效率略低于1-μmPSL。

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