Project title: Efficiency Assessment of an Omni-Directional, Wind and Water Tolerant, High-Volume Bioaerosol Inlet
Completed in: 2010
The Bacillus anthracis contamination of the Hart Senate Office Building on October 15th, 2001 highlighted the need for reliable detect-to-warn bioaerosol collection equipment. Most bacteria of concern have effective diameters of approximately 5 Âµm or less. Likewise, particles of 20 Âµm or more are of little concern because they tend to exceed the thoracic fraction of the human body. An ideal bioaerosol inlet should exhibit reasonably high aspiration efficiencies throughout the 1 Âµm to 10 Âµm range while excluding particles larger than 20 Âµm. This study evaluated a novel bioaerosol inlet by challenging it with 3 Âµm, 7Âµm, and 200 Âµm particles. Gravimetric analysis of the 3 Âµm and 7 Âµm particles revealed a combined efficiency of 82% (74% and 100% respectively) while tracer analysis of the 200 Âµm particles showed an efficiency of 5%. This analysis supports computational fluid dynamics modeling of the inlet as well as its designed intent.